Enhanced photocatalytic degradation rates at rutile TiO2 photocatalysts modified with redox co-catalysts

Susann Neubert, Petra Pulisova, Christian Wiktor, Philipp Weide, Bastian Mei, Dmitrii A. Guschin, Roland A. Fischer, Martin Muhler, Radim Beranek

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

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 > 320 nm) irradiation. The reaction rates were increased by the factor of 7 and 4 for the optimized TiO2(R)-CuOx and TiO2(R)-FeO x samples containing 0.12 wt.% Cu and 0.13 wt.% Fe, respectively. The visible light (λ > 455 nm) 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 TiO 2 photocatalysts with redox co-catalysts based on metal oxides is a promising strategy for enhancing the photocatalytic activity in degradation of aqueous pollutants.

Original languageEnglish
Pages (from-to)97-103
Number of pages7
JournalCatalysis Today
Volume230
DOIs
StatePublished - Jul 2014
Externally publishedYes

Keywords

  • 4-Chlorophenol
  • Co-catalyst
  • Keywords
  • Photocatalysis
  • Rutile
  • Titanium dioxide
  • Water

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