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Enhanced photocatalytic degradation rates at rutile TiO2photocatalysts modified with redox co-catalysts

Authors
Journal
Catalysis Today
0920-5861
Publisher
Elsevier
Volume
230
Identifiers
DOI: 10.1016/j.cattod.2013.11.046
Keywords
  • Photocatalysis
  • Titanium Dioxide
  • Rutile
  • Co-Catalyst
  • 4-Chlorophenol
  • Water

Abstract

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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