Improving effect of MnO2 addition on TiO2-photocatalytic removal of lead ion from water

Abstract

Removal of Pb (II) ions from water was carried out by a coupling approach of adsorption and photoelectrodeposition over a porous TiO2 photocatalyst loaded with MnO2. The addition of MnO2 onto the porous TiO2 accelerated the photocatalytic oxidation of Pb (II) ions, which was caused by a strong interaction between MnO2 and Pb (II) ions. Since the same effect was not observed on the photocatalytic degradation of methylene blue over MnO2/TiO2 photocatalysts, the photoelectrodeposition reaction rate appears to be determined by the amount of Pb (II) ions adsorbed on the surface of porous TiO2 loaded with MnO2.