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.