This chapter presents the study of TiO2 photocatalyst for the photoreduction of several reducible chemicals. The photocatalytic reduction of several toxic metal ions, including Ag(I), Cu(II), Cr(VI), Hg(II), and U(VI) in the presence of TiO2, in order to decrease their toxicity, is described. Photodeposition of the noble metals, such as Ag(I), Au(III), Pt(IV), and Pd(II) for doping purposes by photocatalytic reduction over TiO2, is also addressed. Conversion of the greenhouse gas of CO2 into useful hydrocarbons and methanol by photocatalytic reduction using TiO2 photocatalyst is highlighted. Several operating parameters in photoreduction processes that are photocatalyst dose, time of the irradiation, pH of the solution, and the initial concentration of the substrates (the reducible chemicals) are also reviewed.
Part of the book: Photocatalysts