Removal of Pb (II) ions from water was carried out by a coupling approach of adsorption and photoelectrodeposition over a porous TiO 2 photocatalyst loaded with MnO 2 . The addition of MnO 2 onto the porous TiO 2 accelerated the photocatalytic oxidation of Pb (II) ions, which was caused by a strong interaction between MnO 2 and Pb (II) ions. Since the same effect was not observed on the photocatalytic degradation of methylene blue over MnO 2 /TiO 2 photocatalysts, the photoelectrodeposition reaction rate appears to be determined by the amount of Pb (II) ions adsorbed on the surface of porous TiO 2 loaded with MnO 2 .

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