Marine algae used in bioadsorption removal of heavy and lanthanide metals.
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More than half of the publishers listed alongside IntechOpen (18 out of 30) are Social Science and Humanities publishers. IntechOpen is an exception to this as a leader in not only Open Access content but Open Access content across all scientific disciplines, including Physical Sciences, Engineering and Technology, Health Sciences, Life Science, and Social Sciences and Humanities.
\\n\\nOur breakdown of titles published demonstrates this with 47% PET, 31% HS, 18% LS, and 4% SSH books published.
\\n\\n“Even though ItechOpen has shown the potential of sci-tech books using an OA approach,” other publishers “have shown little interest in OA books.”
\\n\\nAdditionally, each book published by IntechOpen contains original content and research findings.
\\n\\nWe are honored to be among such prestigious publishers and we hope to continue to spearhead that growth in our quest to promote Open Access as a true pioneer in OA book publishing.
\\n\\n\\n\\n
\\n"}]',published:!0,mainMedia:null},components:[{type:"htmlEditorComponent",content:'
Simba Information has released its Open Access Book Publishing 2020 - 2024 report and has again identified IntechOpen as the world’s largest Open Access book publisher by title count.
\n\nSimba Information is a leading provider for market intelligence and forecasts in the media and publishing industry. The report, published every year, provides an overview and financial outlook for the global professional e-book publishing market.
\n\nIntechOpen, De Gruyter, and Frontiers are the largest OA book publishers by title count, with IntechOpen coming in at first place with 5,101 OA books published, a good 1,782 titles ahead of the nearest competitor.
\n\nSince the first Open Access Book Publishing report published in 2016, IntechOpen has held the top stop each year.
\n\n\n\nMore than half of the publishers listed alongside IntechOpen (18 out of 30) are Social Science and Humanities publishers. IntechOpen is an exception to this as a leader in not only Open Access content but Open Access content across all scientific disciplines, including Physical Sciences, Engineering and Technology, Health Sciences, Life Science, and Social Sciences and Humanities.
\n\nOur breakdown of titles published demonstrates this with 47% PET, 31% HS, 18% LS, and 4% SSH books published.
\n\n“Even though ItechOpen has shown the potential of sci-tech books using an OA approach,” other publishers “have shown little interest in OA books.”
\n\nAdditionally, each book published by IntechOpen contains original content and research findings.
\n\nWe are honored to be among such prestigious publishers and we hope to continue to spearhead that growth in our quest to promote Open Access as a true pioneer in OA book publishing.
\n\n\n\n
\n'}],latestNews:[{slug:"stanford-university-identifies-top-2-scientists-over-1-000-are-intechopen-authors-and-editors-20210122",title:"Stanford University Identifies Top 2% Scientists, Over 1,000 are IntechOpen Authors and Editors"},{slug:"intechopen-authors-included-in-the-highly-cited-researchers-list-for-2020-20210121",title:"IntechOpen Authors Included in the Highly Cited Researchers List for 2020"},{slug:"intechopen-maintains-position-as-the-world-s-largest-oa-book-publisher-20201218",title:"IntechOpen Maintains Position as the World’s Largest OA Book Publisher"},{slug:"all-intechopen-books-available-on-perlego-20201215",title:"All IntechOpen Books Available on Perlego"},{slug:"oiv-awards-recognizes-intechopen-s-editors-20201127",title:"OIV Awards Recognizes IntechOpen's Editors"},{slug:"intechopen-joins-crossref-s-initiative-for-open-abstracts-i4oa-to-boost-the-discovery-of-research-20201005",title:"IntechOpen joins Crossref's Initiative for Open Abstracts (I4OA) to Boost the Discovery of Research"},{slug:"intechopen-hits-milestone-5-000-open-access-books-published-20200908",title:"IntechOpen hits milestone: 5,000 Open Access books published!"},{slug:"intechopen-books-hosted-on-the-mathworks-book-program-20200819",title:"IntechOpen Books Hosted on the MathWorks Book Program"}]},book:{item:{type:"book",id:"332",leadTitle:null,fullTitle:"Crystalline Silicon - Properties and Uses",title:"Crystalline Silicon",subtitle:"Properties and Uses",reviewType:"peer-reviewed",abstract:"The exciting world of crystalline silicon is the source of the spectacular advancement of discrete electronic devices and solar cells. 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In 1979 he joined IIT Kharagpur as a faculty member of Materials Science Center. He spent one year (1995-96) in the State University of Milan as an ICTP senior research fellow. He also spent 3 months (2000) in the Institute of Atom Research, Science City, Tsukuba, Japan as JSPS fellow. He was the foreign expert of the evaluation committee of the Singapore-MIT research alliance of the National University of Singapore (NUS). He also served as the member of the expert committee of the National Program on Smart Materials (NPSM) and the project evaluation committee of the Department of Science and Technology (DST), Government of India. Prof. Basu was the joint investigator of an India-Sweden Research Program funded by Swedish Research Council (SRC) during 2008-2010 and he visited Linkoping University, Sweden. He was a joint investigator of an India-Brazil-South Africa (IBSA) collaborative Research Program involving IIT Kharagpur, India, Sao Paolo University, Brazil and Cape Town University, S. Africa for the period 2011 and 2014. 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Water which is the key element responsible for life in the world is becoming more valuable due to the increased consumption and demand. In order to provide a locally controlled water supply, wastewater recycling offers great environmental advantages. Recycling of water can corporate in decreasing the consumption of water from sensitive ecosystem, reducing the environmental pollution, and even preventing accumulation of pollutants in our ecosystem. The US Environmental Protection Agency (USEPA) has suggested three stages of water recycling; in the primary stage that can be achieved by a sedimentation process, normally the produced water is not suitable for any use. The biological oxidation and disinfection process are used to reach the secondary stage. The produced water from that stage can be used mainly for irrigation of nonfood crop and industrial cooling system. The tertiary stage in wastewater treatment is reached using chemical, coagulation, filtration, and disinfection processes. Produced water in the tertiary stage can be employed mostly for irrigation of food crops and landscape, washing of vehicles, and flushing toilet [1]. Good quality water (i.e., water free of contaminants) is essential to human health and a critical feedstock in a variety of key industries including oil and gas, petrochemicals, pharmaceuticals, and food. The available supplies of water are decreasing due to (1) low precipitation, (2) increased population growth, (3) more strict health-based regulations, and (4) competing demands from a variety of users, e.g., industrial, agricultural, and urban development. In addition, our water today became such type of cocktail of chemicals that has more than 100 of toxic compounds, viruses, bacteria, and metals. Consequently, water scientists and engineers are seeking alternative sources of water and new technologies for wastewater treatment and recycling. These wastewaters include but not limited to sewage effluent, contaminated surface or groundwater, and industrial wastewater. Water recovery-recycle-reuse has proven to be effective and successful in creating a new and reliable water supply while not compromising public health [2].
Water pollution with contaminants became a global issue. Among of these contaminants, heavy metals have a greater concern mainly due to their bioaccumulation, toxicity, and non-biodegradability. Their non-biodegradability nature makes their existence in water to cause great risk to living organisms. Accordingly, many government environmental agencies such the US Environmental Protection Agency (USEPA) and World Health Organization (WHO) have set the maximum acceptable concentration level for heavy metals in recycled water. Therefore, different methodologies, with varying level of success, have been employed to remove these contaminations from water and wastewater. Biological treatment (aerobic and anaerobic), coagulation, precipitation, oxidation, membrane, and filtration are common methods of removing microorganisms and ionic and cationic compounds from wastewater streams. The performance of these methods is generally acceptable at low concentration of heavy metals below few hundred ppm, which is the main drawback of them. Even though most of the wastewater treatment technologies available today are effective, they are often costly and time-consuming methods. Bioadsorption is considered as among the most promising low-cost process for wastewater treatment. Numerous materials were used as adsorbents to remove heavy metal ions from water, such as metal oxides, activated carbon, zeolite, chitin, metal sulfide, resin, etc. The search for new and more effective materials to be used as bioadsorbent materials has a continuous effort and been considered by many researchers. Since 1990 till now, there are more than 5000 publications in the field of bioadsorption of heavy metals, and approximately 6% of these publications have been concerned on using marine algae [3]. Figure 1(a and b) shows the dramatic increase in both the number of publications and their citations versus time.
Histograms for (a) number of publications in the field of biosorption of heavy metals and (b) the number of citations each year on these publication [3].
Marine algae are one of the most highly available natural resources in tropical ecosystem where around 2 million tons of them are collected from seas and oceans and cultured in artificial system [4]. They are useful in different applications such as pharmaceutical, food, and cosmetic industries. Algae have rich biochemical composition; therefore, its biomass is a promising material to be used as bioadsorbent to decontaminate water and wastewater by removing pollutants such as heavy metals [5, 6]. Marine algae are commonly known as seaweeds, and they had a great potential to be used in pollutant removal process as a promising bioadsorbents material. This is due to their renewable availability, distinct properties, and high biosorption capacity. Seaweeds are divided into three main broad groups, namely, (i) green (Chlorophyta), (ii) red (Rhodophyta), and (iii) brown (Phaeophyta) algae. Marine algae have many advantages for bioadsorption. Among them brown algae provided the best adsorption capacities due to their cell wall structure and components. The cell wall of brown algae has a lot of active chemical functional groups such hydroxyl, carboxylic acid, amine, imidazole, phosphate, phenolic, thioether, and sulfhydryl which offer a selective binding and interaction with metals and pollutants in the bioadsorption process. It contains mainly cellulose, a group of salts of sodium, potassium magnesium, and calcium, and alginate, which is a type of polysaccharide (anionic copolymer) [7].
Figure 2 illustrates the main four mechanisms of heavy metal uptake by bioadsorbents. The first one is ion-exchange process including ionic or cationic exchange. The surface of the cell wall contains mainly organic nitrogen group in the case of ionic exchange or hydroxyl and organic sulfate or phosphate in the case of cationic exchange. The uptake mechanism can be a complexation through a covalent or electrostatic interaction where the metal ions form a complex compound with organic molecules. The third mechanism is chelation which involves an interaction between the metal and an organic compound that has more than one electron donor functional group. The last one is through precipitation that occurs when the pH of the solution varies due to cellular metabolism or when the concentration of metals increases [8].
Classification of metal uptake mechanism by bioadsorbents.
Table 1 summarizes some of the marine algae (red, green, and brown), those used for removal of transition, actinide, or lanthanide metals. Many researchers found that the Sargassum brown algae has a high adsorption capacity to remove heavy metals such as Cu, Ni, Cd, Pd, Cr, Sm, and Pr from their solution efficiently due to its cell wall structure that is rich in active bioadsorption sites [9, 10, 15, 17, 18, 19]. Mostly, bioadsorption offers many advantages over the bioaccumulation process since bioadsorbents are available commonly as by-product or waste, as well as they do not need growth media and growth conditions. As a result, they are considered low-cost materials with high possibility to be reused for many cycles. The literatures show that marine algae can be used for the removal of heavy metals in dead or live forms. However, in industrial applications, the nonliving marine algae provide more practical bioadsorbent materials for the removal of pollutants. This is because toxicity of heavy metals and other pollutants do not affect dead biomass. In addition, the performance of those bioadsorbents can be improved by physical treatments such as heating or chemical processing such as acid or base treatments. This enhancement in their biosorption capacity is attributed to activation of the adsorption sites as well as rearrangement of the cell wall structure to be more accessible and compatible for pollutants capturing and removal [35].
Number | Name of algae | Removed metals | Ref. |
---|---|---|---|
1 | Sargassum sp. | Cu | [9] |
2 | Sargassum sp. | Sm and Pr | [10] |
3 | Spirogyra spp. | Cr | [11] |
4 | Sargassum vulgaris | Cd and Ni | [12] |
5 | Sargassum hystrix | Pb | [13] |
6 | Sargassum natans | Pb | [13] |
7 | Sargassum hemiphyllum | Ni and Cu | [14] |
8 | Sargassum wightii | Ni | [15] |
9 | Sargassum sp. | Cr | [15] |
10 | Sargassum honeri and S. hemiphyllum | Ho, Dy, Lu, and Yb | [16] |
11 | Sargassum ilicifolium | Ni and Co | [17] |
12 | Sargassum sp. | La, Nb, Eu, and Gd | [18] |
13 | Sargassum muticum and Fucus spiralis (brown algae) | Pd, Zn, and Cd | [19] |
14 | Fucus vesiculosus (brown algae) | Cu | [20] |
15 | Palmaria palmata (red algae) | Cu | [20] |
16 | Fucus spiralis (brown algae) | Cu | [20] |
17 | Ulva sp. (green algae) | Cu | [20] |
18 | Fucus ceranoides and Fucus serratus (brown algae) | Cd | [21] |
19 | Laminaria japonica | Cd, Pb, and Fe | [22] |
20 | Laminaria japonica (washed or oxidized by potassium permanganate) | Pb | [23] |
21 | Gracilaria fischeri | Cu and Cd | [24] |
22 | Gracilaria sp. | Cd, Cu, Zn, Pb, and Ni | [25] |
Padina sp. | Cd, Cu, Zn, Pb, and Ni | [25] | |
23 | Pilayella littoralis | Cr, Fe, Al, Cd, Cu, Zn, Co, and Ni | [26] |
24 | Cladophora crispata | Pb, Cu, Cd, and Ag | [27] |
25 | Cladophora fascicularis | Cu and Pb | [28] |
26 | Ecklonia sp. | Cr | [29] |
27 | Colpomenia sinuosa | Ni and Cu | [14] |
28 | Petalonia fascia | Ni and Cu | [14] |
29 | Ulva fascia | Ni and Cu | [14] |
30 | Padina pavonica | Ni and Cd | [12] |
31 | Sargassum cymosum | Cr | [30] |
32 | Turbinaria conoides | Pb | [31] |
33 | Laurencia obtusa | Cd, Co, Cr, Cu, and Ni | [32] |
34 | Ulva reticulata | Zn | [33] |
35 | Ascophyllum nodosum Fucus spiralis Laminaria hyperborean Pelvetia canaliculata | Cu, Ni, Zn, and Ca | [34] |
Marine algae used in bioadsorption removal of heavy and lanthanide metals.
An idea about the adsorption process is predicted using the correlation between the pressure or the concentration of adsorbate and the adsorption capacity (X/m) at constant temperature as shown in Figure 3.
Adsorption isotherm.
The amount of adsorbate (X) adsorbed should be normalized by the mass of adsorbent (m) to allow comparison of different materials. From Figure 1, it can be predicted that after the saturation point, the number of adsorption sites on the adsorbent is occupied, and the vacancies became limited so that the adsorption does not occur anymore. There are five general types of adsorption isotherms. They are as follows:
Type I adsorption isotherm (shown in Figure 2)
The main characteristics of this type are (i) there is a monolayer adsorption and (ii) it might be explained using the Langmuir adsorption isotherm.
Type II adsorption isotherm
Figure 4 shows a typical adsorption isotherm curve of type II. This type of adsorption shows a large deviation from the Langmuir isotherm model and a flat region, which is corresponding to a monolayer formation.
Type III adsorption isotherm
Type II adsorption isotherm.
This type of isotherm indicates that there is no flat region as shown in Figure 5, and also there are formations of multilayer adsorption.
Type IV adsorption isotherm
Type III adsorption isotherm.
It can be depicted from Figure 6 that there is a monolayer formation (intermediate region), which is followed by a multilayer formation at certain adsorbate concentration. At low concentration of adsorbate, the adsorption is mostly similar to type II adsorption isotherm.
Type V adsorption isotherm
Type IV adsorption isotherm.
It is similar to type IV with a difference in the range of adsorbate’s concentration where the monolayer and multilayer start the formation as shown in Figure 7.
Type V adsorption isotherm.
The adsorption isotherms usually are being studied to understand the adsorption behavior modulation and to calculate the adsorption capacity for the adsorbents, so the data analysis is done using a linear/nonlinear least squares methods of adsorption isotherms, where they describe the relationship between the adsorbed amount of adsorbate and its equilibrium concentration in the solution.
The Freundlich, Langmuir, Temkin, Sips, and Redlich-Peterson models are the most common types of the adsorption isotherms to describe the metal ion bioadsorption from their single component solution.
The Freundlich isotherm (Eq. 1) is an empirical model where the adsorption occurs on heterogeneous adsorption sites on adsorbent surface, which is the general case in macroalgae bioadsorbents:
where
qe: The adsorption density at equilibrium (mg adsorbate/g of adsorbent).
Ce: The residual adsorbate concentration in the solution (mg/L) at equilibrium.
Kf: The relative adsorption capacity (mg1−1/n11/n/g).
n: The unit less constants reflect the adsorption intensity.
A plot of lnCe against lnqe will give a straight line with a slope 1/n and intercept LnKf. Smaller 1/n greater expected heterogeneity [35]. It is worthy here to note that usually the adsorption data have a good fit with the Freundlich isotherm model due to the well-known insensitivity of its linear form (ln-ln plot).
The Langmuir adsorption isotherms model is considered as the best known for describing a monolayer chemical adsorption process on homogenous adsorption sites on adsorbent surfaces. It partially considers the thermodynamic in the adsorption process. It is expressed in Eq. (2):
where
qe: The adsorption capacity at equilibrium (mg of adsorbate/g of adsorbent).
Ce: The residual adsorbate concentration at equilibrium in solution (mg/L).
qmax: The maximum adsorption capacity corresponding to monolayer coverage (mg of analyte adsorbed/g of adsorbent).
b: The Langmuir constant correlated to the adsorption energy (1/mg adsorbate).
The essential features of the Langmuir isotherm may be expressed in terms of equilibrium parameter RL (Eq. 3), which is a dimensionless constant referred to as separation factor or equilibrium parameter [36]:
The most used linear form of the Langmuir model is the following form (Eq. 4), which is also called reciprocal Langmuir plot:
Plotting Ce/qe versus Ce from the experimental data gives a linear regression where the slope for that plot gives the experimental maximum adsorption capacity qmax, and the intercept gives the Langmuir constant b.
There are another three linear transformation forms of the Langmuir isotherm models: (1) the distribution coefficient or Scatchard plot, (2) Eadie-Hofstee plot, and (3) double reciprocal Lineweaver-Burk plot. Every one of these four linear transformation forms gives a greater weighing to low adsorption values than to high adsorption values, which leads to changing in the error distribution [37].
The energy of adsorption can be described using the Temkin isotherm (Eq. 5). However, this isotherm is valid only for an intermediate range of adsorbate concentrations [38]:
Rearranging Eq. (4) results in Eq. (6):
Plotting qe versus ln(Ce) gives a linear regression where the slope for that plot gives the Temkin isotherm constant (b) and the intercept gives the Temkin isotherm equilibrium binding constant (AT) (L/g), where R is the universal gas constant (8.314 J/mol K), T is the temperature in Kelvin (K), and B in Eq. (7) is a constant related to heat of adsorption (J/mol):
The Sips isotherm model for mono-component system is a combination between the Freundlich and Langmuir isotherm models. Eq. (8) expresses the Sips model:
where
qe: The adsorption capacity at equilibrium (mg of adsorbate/g of adsorbent).
Ce: The residual adsorbate concentration at equilibrium in solution (mg/L).
qmax: The maximum adsorption capacity corresponding to monolayer coverage (mg of analyte adsorbed/g of adsorbent).
b: The Langmuir constant correlated to the adsorption energy (1/mg adsorbate).
ns: The Sips constant for the heterogeneity of binding surface.
As an extension for the Langmuir isotherm, a model with three parameters was established expressed in Eq. (9). That is Redlich-Peterson isotherm:
where Ce (mg/L) is the residual adsorbate concentration at equilibrium in the solution and qe (mg/g) is the adsorption capacity at equilibrium. However, aRP (1/g) and bRP (1/mg)nRP do not have physical or chemical meaning. The third parameter nRP is dimensionless that gives an idea about the heterogeneity of adsorption sites on the surface of adsorbents [39].
Studying the uptake rate of heavy metals is achieved by the adsorption kinetics where the metal ion uptake rate clearly controls residence time of these compounds at the solid-liquid interface, so and in sequence the mechanism of heavy metal adsorption on the biomass materials will be evaluated using the most common kinetic models.
The simplest one which expresses on the proportionality between the metal adsorption and the number of vacant adsorption sites on the surface of adsorbents is Lagergren model (pseudo-first-order). The nonlinear and linear forms of the model are represented in Eqs. (10) and (11), respectively [40]:
where qt and qe (mg/g), respectively, are the adsorption capacity at any time (t) and at equilibrium. k1 (1/min) is the pseudo-first-order rate constant.
The kinetic model that has the correlation between the adsorption of metal ions and the square of active vacant adsorption sites on the surface of adsorbents is called pseudo-second-order rate model (Eq. 12) [38]:
Eq. (8) can be rearranged to be in the following linear form (Eq. 13):
where qt and qe (mg/g), respectively, are the adsorption capacity at any time (t) and at equilibrium. k2 (g/mg min) is the pseudo-second-order rate constant.
By plotting ln(qe−qt) versus t and t/qt versus t in the previous equations (Eqs. (11) and (13)), all the adsorption kinetic parameters can be determined from the slope and the intercept.
The influence of mass transfer resistance on binding metal ions on adsorbents was tested using the intra-particle diffusion model (Weber and Morris model) represented in Eq. (14) [41]:
where qt (mg/g) is the adsorption capacity at any time (t), kid (mg/g min0.5) is the intra-particle diffusion rate constant, and C (mg/g) is a constant related to the thickness of the boundary layer. From plotting of qt versus the square root of t, the diffusion constant kid can be calculated. If this plot passes through the origin, then intra-particle diffusion is the only rate-controlling step.
Removal of heavy metals from wastewater would provide an exceptional alternative water resource. Algae biomass adsorbents, which utilized for adsorptive removal of heavy metal pollutants from wastewater, show a promising alternative. Different empirical isotherm models for single analyte have been discussed (i.e., Freundlich, Langmuir, Temkin, Sips, and Redlich-Peterson). In a large number of studies, the Freundlich and Langmuir models are the most commonly and widely used isotherm models. The two kinetic models, which are still in a wide use for studying the rate uptake of heavy metals and their bioadsorption from aqueous solutions, are pseudo-first- and pseudo-second-order kinetic models. In chemisorption process, the pseudo-second-order kinetic model is superior to pseudo-first-order model as it takes into account the interaction of adsorbent-adsorbate through their valency forces.
The support of the Center for Environment and Water in the research institute of King Fahd University of Petroleum and Minerals King Fahd University of Petroleum and Minerals is highly acknowledged.
The author declares that there are no conflicts of interest.
Water which is the key element responsible for life in the world is becoming more valuable due to the increased consumption and demand. In order to provide a locally controlled water supply, wastewater recycling offers great environmental advantages. Recycling of water can corporate in decreasing the consumption of water from sensitive ecosystem, reducing the environmental pollution, and even preventing accumulation of pollutants in our ecosystem. The US Environmental Protection Agency (USEPA) has suggested three stages of water recycling; in the primary stage that can be achieved by a sedimentation process, normally the produced water is not suitable for any use. The biological oxidation and disinfection process are used to reach the secondary stage. The produced water from that stage can be used mainly for irrigation of nonfood crop and industrial cooling system. The tertiary stage in wastewater treatment is reached using chemical, coagulation, filtration, and disinfection processes. Produced water in the tertiary stage can be employed mostly for irrigation of food crops and landscape, washing of vehicles, and flushing toilet [1]. Good quality water (i.e., water free of contaminants) is essential to human health and a critical feedstock in a variety of key industries including oil and gas, petrochemicals, pharmaceuticals, and food. The available supplies of water are decreasing due to (1) low precipitation, (2) increased population growth, (3) more strict health-based regulations, and (4) competing demands from a variety of users, e.g., industrial, agricultural, and urban development. In addition, our water today became such type of cocktail of chemicals that has more than 100 of toxic compounds, viruses, bacteria, and metals. Consequently, water scientists and engineers are seeking alternative sources of water and new technologies for wastewater treatment and recycling. These wastewaters include but not limited to sewage effluent, contaminated surface or groundwater, and industrial wastewater. Water recovery-recycle-reuse has proven to be effective and successful in creating a new and reliable water supply while not compromising public health [2].
Water pollution with contaminants became a global issue. Among of these contaminants, heavy metals have a greater concern mainly due to their bioaccumulation, toxicity, and non-biodegradability. Their non-biodegradability nature makes their existence in water to cause great risk to living organisms. Accordingly, many government environmental agencies such the US Environmental Protection Agency (USEPA) and World Health Organization (WHO) have set the maximum acceptable concentration level for heavy metals in recycled water. Therefore, different methodologies, with varying level of success, have been employed to remove these contaminations from water and wastewater. Biological treatment (aerobic and anaerobic), coagulation, precipitation, oxidation, membrane, and filtration are common methods of removing microorganisms and ionic and cationic compounds from wastewater streams. The performance of these methods is generally acceptable at low concentration of heavy metals below few hundred ppm, which is the main drawback of them. Even though most of the wastewater treatment technologies available today are effective, they are often costly and time-consuming methods. Bioadsorption is considered as among the most promising low-cost process for wastewater treatment. Numerous materials were used as adsorbents to remove heavy metal ions from water, such as metal oxides, activated carbon, zeolite, chitin, metal sulfide, resin, etc. The search for new and more effective materials to be used as bioadsorbent materials has a continuous effort and been considered by many researchers. Since 1990 till now, there are more than 5000 publications in the field of bioadsorption of heavy metals, and approximately 6% of these publications have been concerned on using marine algae [3]. Figure 1(a and b) shows the dramatic increase in both the number of publications and their citations versus time.
Histograms for (a) number of publications in the field of biosorption of heavy metals and (b) the number of citations each year on these publication [3].
Marine algae are one of the most highly available natural resources in tropical ecosystem where around 2 million tons of them are collected from seas and oceans and cultured in artificial system [4]. They are useful in different applications such as pharmaceutical, food, and cosmetic industries. Algae have rich biochemical composition; therefore, its biomass is a promising material to be used as bioadsorbent to decontaminate water and wastewater by removing pollutants such as heavy metals [5, 6]. Marine algae are commonly known as seaweeds, and they had a great potential to be used in pollutant removal process as a promising bioadsorbents material. This is due to their renewable availability, distinct properties, and high biosorption capacity. Seaweeds are divided into three main broad groups, namely, (i) green (Chlorophyta), (ii) red (Rhodophyta), and (iii) brown (Phaeophyta) algae. Marine algae have many advantages for bioadsorption. Among them brown algae provided the best adsorption capacities due to their cell wall structure and components. The cell wall of brown algae has a lot of active chemical functional groups such hydroxyl, carboxylic acid, amine, imidazole, phosphate, phenolic, thioether, and sulfhydryl which offer a selective binding and interaction with metals and pollutants in the bioadsorption process. It contains mainly cellulose, a group of salts of sodium, potassium magnesium, and calcium, and alginate, which is a type of polysaccharide (anionic copolymer) [7].
Figure 2 illustrates the main four mechanisms of heavy metal uptake by bioadsorbents. The first one is ion-exchange process including ionic or cationic exchange. The surface of the cell wall contains mainly organic nitrogen group in the case of ionic exchange or hydroxyl and organic sulfate or phosphate in the case of cationic exchange. The uptake mechanism can be a complexation through a covalent or electrostatic interaction where the metal ions form a complex compound with organic molecules. The third mechanism is chelation which involves an interaction between the metal and an organic compound that has more than one electron donor functional group. The last one is through precipitation that occurs when the pH of the solution varies due to cellular metabolism or when the concentration of metals increases [8].
Classification of metal uptake mechanism by bioadsorbents.
Table 1 summarizes some of the marine algae (red, green, and brown), those used for removal of transition, actinide, or lanthanide metals. Many researchers found that the Sargassum brown algae has a high adsorption capacity to remove heavy metals such as Cu, Ni, Cd, Pd, Cr, Sm, and Pr from their solution efficiently due to its cell wall structure that is rich in active bioadsorption sites [9, 10, 15, 17, 18, 19]. Mostly, bioadsorption offers many advantages over the bioaccumulation process since bioadsorbents are available commonly as by-product or waste, as well as they do not need growth media and growth conditions. As a result, they are considered low-cost materials with high possibility to be reused for many cycles. The literatures show that marine algae can be used for the removal of heavy metals in dead or live forms. However, in industrial applications, the nonliving marine algae provide more practical bioadsorbent materials for the removal of pollutants. This is because toxicity of heavy metals and other pollutants do not affect dead biomass. In addition, the performance of those bioadsorbents can be improved by physical treatments such as heating or chemical processing such as acid or base treatments. This enhancement in their biosorption capacity is attributed to activation of the adsorption sites as well as rearrangement of the cell wall structure to be more accessible and compatible for pollutants capturing and removal [35].
Number | Name of algae | Removed metals | Ref. |
---|---|---|---|
1 | Sargassum sp. | Cu | [9] |
2 | Sargassum sp. | Sm and Pr | [10] |
3 | Spirogyra spp. | Cr | [11] |
4 | Sargassum vulgaris | Cd and Ni | [12] |
5 | Sargassum hystrix | Pb | [13] |
6 | Sargassum natans | Pb | [13] |
7 | Sargassum hemiphyllum | Ni and Cu | [14] |
8 | Sargassum wightii | Ni | [15] |
9 | Sargassum sp. | Cr | [15] |
10 | Sargassum honeri and S. hemiphyllum | Ho, Dy, Lu, and Yb | [16] |
11 | Sargassum ilicifolium | Ni and Co | [17] |
12 | Sargassum sp. | La, Nb, Eu, and Gd | [18] |
13 | Sargassum muticum and Fucus spiralis (brown algae) | Pd, Zn, and Cd | [19] |
14 | Fucus vesiculosus (brown algae) | Cu | [20] |
15 | Palmaria palmata (red algae) | Cu | [20] |
16 | Fucus spiralis (brown algae) | Cu | [20] |
17 | Ulva sp. (green algae) | Cu | [20] |
18 | Fucus ceranoides and Fucus serratus (brown algae) | Cd | [21] |
19 | Laminaria japonica | Cd, Pb, and Fe | [22] |
20 | Laminaria japonica (washed or oxidized by potassium permanganate) | Pb | [23] |
21 | Gracilaria fischeri | Cu and Cd | [24] |
22 | Gracilaria sp. | Cd, Cu, Zn, Pb, and Ni | [25] |
Padina sp. | Cd, Cu, Zn, Pb, and Ni | [25] | |
23 | Pilayella littoralis | Cr, Fe, Al, Cd, Cu, Zn, Co, and Ni | [26] |
24 | Cladophora crispata | Pb, Cu, Cd, and Ag | [27] |
25 | Cladophora fascicularis | Cu and Pb | [28] |
26 | Ecklonia sp. | Cr | [29] |
27 | Colpomenia sinuosa | Ni and Cu | [14] |
28 | Petalonia fascia | Ni and Cu | [14] |
29 | Ulva fascia | Ni and Cu | [14] |
30 | Padina pavonica | Ni and Cd | [12] |
31 | Sargassum cymosum | Cr | [30] |
32 | Turbinaria conoides | Pb | [31] |
33 | Laurencia obtusa | Cd, Co, Cr, Cu, and Ni | [32] |
34 | Ulva reticulata | Zn | [33] |
35 | Ascophyllum nodosum Fucus spiralis Laminaria hyperborean Pelvetia canaliculata | Cu, Ni, Zn, and Ca | [34] |
Marine algae used in bioadsorption removal of heavy and lanthanide metals.
An idea about the adsorption process is predicted using the correlation between the pressure or the concentration of adsorbate and the adsorption capacity (X/m) at constant temperature as shown in Figure 3.
Adsorption isotherm.
The amount of adsorbate (X) adsorbed should be normalized by the mass of adsorbent (m) to allow comparison of different materials. From Figure 1, it can be predicted that after the saturation point, the number of adsorption sites on the adsorbent is occupied, and the vacancies became limited so that the adsorption does not occur anymore. There are five general types of adsorption isotherms. They are as follows:
Type I adsorption isotherm (shown in Figure 2)
The main characteristics of this type are (i) there is a monolayer adsorption and (ii) it might be explained using the Langmuir adsorption isotherm.
Type II adsorption isotherm
Figure 4 shows a typical adsorption isotherm curve of type II. This type of adsorption shows a large deviation from the Langmuir isotherm model and a flat region, which is corresponding to a monolayer formation.
Type III adsorption isotherm
Type II adsorption isotherm.
This type of isotherm indicates that there is no flat region as shown in Figure 5, and also there are formations of multilayer adsorption.
Type IV adsorption isotherm
Type III adsorption isotherm.
It can be depicted from Figure 6 that there is a monolayer formation (intermediate region), which is followed by a multilayer formation at certain adsorbate concentration. At low concentration of adsorbate, the adsorption is mostly similar to type II adsorption isotherm.
Type V adsorption isotherm
Type IV adsorption isotherm.
It is similar to type IV with a difference in the range of adsorbate’s concentration where the monolayer and multilayer start the formation as shown in Figure 7.
Type V adsorption isotherm.
The adsorption isotherms usually are being studied to understand the adsorption behavior modulation and to calculate the adsorption capacity for the adsorbents, so the data analysis is done using a linear/nonlinear least squares methods of adsorption isotherms, where they describe the relationship between the adsorbed amount of adsorbate and its equilibrium concentration in the solution.
The Freundlich, Langmuir, Temkin, Sips, and Redlich-Peterson models are the most common types of the adsorption isotherms to describe the metal ion bioadsorption from their single component solution.
The Freundlich isotherm (Eq. 1) is an empirical model where the adsorption occurs on heterogeneous adsorption sites on adsorbent surface, which is the general case in macroalgae bioadsorbents:
where
qe: The adsorption density at equilibrium (mg adsorbate/g of adsorbent).
Ce: The residual adsorbate concentration in the solution (mg/L) at equilibrium.
Kf: The relative adsorption capacity (mg1−1/n11/n/g).
n: The unit less constants reflect the adsorption intensity.
A plot of lnCe against lnqe will give a straight line with a slope 1/n and intercept LnKf. Smaller 1/n greater expected heterogeneity [35]. It is worthy here to note that usually the adsorption data have a good fit with the Freundlich isotherm model due to the well-known insensitivity of its linear form (ln-ln plot).
The Langmuir adsorption isotherms model is considered as the best known for describing a monolayer chemical adsorption process on homogenous adsorption sites on adsorbent surfaces. It partially considers the thermodynamic in the adsorption process. It is expressed in Eq. (2):
where
qe: The adsorption capacity at equilibrium (mg of adsorbate/g of adsorbent).
Ce: The residual adsorbate concentration at equilibrium in solution (mg/L).
qmax: The maximum adsorption capacity corresponding to monolayer coverage (mg of analyte adsorbed/g of adsorbent).
b: The Langmuir constant correlated to the adsorption energy (1/mg adsorbate).
The essential features of the Langmuir isotherm may be expressed in terms of equilibrium parameter RL (Eq. 3), which is a dimensionless constant referred to as separation factor or equilibrium parameter [36]:
The most used linear form of the Langmuir model is the following form (Eq. 4), which is also called reciprocal Langmuir plot:
Plotting Ce/qe versus Ce from the experimental data gives a linear regression where the slope for that plot gives the experimental maximum adsorption capacity qmax, and the intercept gives the Langmuir constant b.
There are another three linear transformation forms of the Langmuir isotherm models: (1) the distribution coefficient or Scatchard plot, (2) Eadie-Hofstee plot, and (3) double reciprocal Lineweaver-Burk plot. Every one of these four linear transformation forms gives a greater weighing to low adsorption values than to high adsorption values, which leads to changing in the error distribution [37].
The energy of adsorption can be described using the Temkin isotherm (Eq. 5). However, this isotherm is valid only for an intermediate range of adsorbate concentrations [38]:
Rearranging Eq. (4) results in Eq. (6):
Plotting qe versus ln(Ce) gives a linear regression where the slope for that plot gives the Temkin isotherm constant (b) and the intercept gives the Temkin isotherm equilibrium binding constant (AT) (L/g), where R is the universal gas constant (8.314 J/mol K), T is the temperature in Kelvin (K), and B in Eq. (7) is a constant related to heat of adsorption (J/mol):
The Sips isotherm model for mono-component system is a combination between the Freundlich and Langmuir isotherm models. Eq. (8) expresses the Sips model:
where
qe: The adsorption capacity at equilibrium (mg of adsorbate/g of adsorbent).
Ce: The residual adsorbate concentration at equilibrium in solution (mg/L).
qmax: The maximum adsorption capacity corresponding to monolayer coverage (mg of analyte adsorbed/g of adsorbent).
b: The Langmuir constant correlated to the adsorption energy (1/mg adsorbate).
ns: The Sips constant for the heterogeneity of binding surface.
As an extension for the Langmuir isotherm, a model with three parameters was established expressed in Eq. (9). That is Redlich-Peterson isotherm:
where Ce (mg/L) is the residual adsorbate concentration at equilibrium in the solution and qe (mg/g) is the adsorption capacity at equilibrium. However, aRP (1/g) and bRP (1/mg)nRP do not have physical or chemical meaning. The third parameter nRP is dimensionless that gives an idea about the heterogeneity of adsorption sites on the surface of adsorbents [39].
Studying the uptake rate of heavy metals is achieved by the adsorption kinetics where the metal ion uptake rate clearly controls residence time of these compounds at the solid-liquid interface, so and in sequence the mechanism of heavy metal adsorption on the biomass materials will be evaluated using the most common kinetic models.
The simplest one which expresses on the proportionality between the metal adsorption and the number of vacant adsorption sites on the surface of adsorbents is Lagergren model (pseudo-first-order). The nonlinear and linear forms of the model are represented in Eqs. (10) and (11), respectively [40]:
where qt and qe (mg/g), respectively, are the adsorption capacity at any time (t) and at equilibrium. k1 (1/min) is the pseudo-first-order rate constant.
The kinetic model that has the correlation between the adsorption of metal ions and the square of active vacant adsorption sites on the surface of adsorbents is called pseudo-second-order rate model (Eq. 12) [38]:
Eq. (8) can be rearranged to be in the following linear form (Eq. 13):
where qt and qe (mg/g), respectively, are the adsorption capacity at any time (t) and at equilibrium. k2 (g/mg min) is the pseudo-second-order rate constant.
By plotting ln(qe−qt) versus t and t/qt versus t in the previous equations (Eqs. (11) and (13)), all the adsorption kinetic parameters can be determined from the slope and the intercept.
The influence of mass transfer resistance on binding metal ions on adsorbents was tested using the intra-particle diffusion model (Weber and Morris model) represented in Eq. (14) [41]:
where qt (mg/g) is the adsorption capacity at any time (t), kid (mg/g min0.5) is the intra-particle diffusion rate constant, and C (mg/g) is a constant related to the thickness of the boundary layer. From plotting of qt versus the square root of t, the diffusion constant kid can be calculated. If this plot passes through the origin, then intra-particle diffusion is the only rate-controlling step.
Removal of heavy metals from wastewater would provide an exceptional alternative water resource. Algae biomass adsorbents, which utilized for adsorptive removal of heavy metal pollutants from wastewater, show a promising alternative. Different empirical isotherm models for single analyte have been discussed (i.e., Freundlich, Langmuir, Temkin, Sips, and Redlich-Peterson). In a large number of studies, the Freundlich and Langmuir models are the most commonly and widely used isotherm models. The two kinetic models, which are still in a wide use for studying the rate uptake of heavy metals and their bioadsorption from aqueous solutions, are pseudo-first- and pseudo-second-order kinetic models. In chemisorption process, the pseudo-second-order kinetic model is superior to pseudo-first-order model as it takes into account the interaction of adsorbent-adsorbate through their valency forces.
The support of the Center for Environment and Water in the research institute of King Fahd University of Petroleum and Minerals King Fahd University of Petroleum and Minerals is highly acknowledged.
The author declares that there are no conflicts of interest.
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