Abstract
Nanocrystalline rutile TiO2 powders were modified with small amounts of CuOx and FeOx clusters by impregnation and drying. The modified rutile samples exhibited drastically enhanced photocatalytic degradation of 4-chlorophenol under UV+vis (λ>320nm) irradiation. The reaction rates were increased by the factor of 7 and 4 for the optimized TiO2(R)-CuOx and TiO2(R)-FeOx samples containing 0.12wt.% Cu and 0.13wt.% Fe, respectively. The visible light (λ>455nm) activity in 4-CP degradation was negligible. Photopotential transient measurements have confirmed that amorphous CuOx and FeOx clusters deposited at the surface of rutile TiO2 act as efficient co-catalysts for oxygen reduction by photogenerated electrons, which leads to improved charge separation and diminished recombination. This study shows that simple modification of TiO2 photocatalysts with redox co-catalysts based on metal oxides is a promising strategy for enhancing the photocatalytic activity in degradation of aqueous pollutants.
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