Photocatalytic reduction of nitrite and nitrate ions over doped TiO2 catalysts

Abstract

Doping of TiO2 with altervalent cations, Fe 3 +, Cr 3 +, Co 2 + and Mg 2+ leads to a red shift in the onset of absorption. The role of the dopant ions is primarily to improve the charge separation by means of a permanent electric field. Doping of TiO2 also influences the adsorption of reagent species and the resulting photoactivity is a consequence of these two factors. An optimum level of dopant ions is beneficial for the photocatalyt'c activity of TiO2.