Photocatalytic reduction of Cr(VI) with TiO2 film under visible light

Abstract

The performance of photocatalytic reduction of chromium (VI) via a new TiO2 film and a platinum anode was systematically evaluated. The as-prepared TiO2 film is composed of a dye-sensitized zone and a catalysis zone. Charge separation was accomplished with electron transferring to the catalysis zone and positive charge transforming to an anode. A powerful reduction ability of the reaction system was achieved in the absence of any organics under visible light irradiation. Several parameters including pH, dissolved O2, the primary active species, the durability of the as-synthetized film and so on were investigated.