Photoeletrocatalytic activity of a Cu2O-loaded self-organized highly oriented TiO2nanotube array electrode for 4-chlorophenol degradation

Yang Hou, Xinyong Li, Xuejun Zou, Xie Quan, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

235 Citations (Scopus)

Abstract

Differently sized Cu2O nanoparticles have been assembled photocatalytically on the surface of self-organized highly oriented TiO2nanotubes obtained by anodization of a Ti sheet in fluoride- containing electrolytes. X-ray diffraction analysis identifies an anatase structure and fine preferential orientation of (101) planes. The UV-vis absorption edge of the TiO2nanotube arrays shift to lower energy after Cu2O loading. The composite array electrode exhibits a higher photovoltage response than the TiO2powders directly deposited on a Ti sheet. The highest photoconversion efficiencies observed for the Cu2O-loaded electrode are 17.2% and 0.82% under UV light and visible light irradiation, respectively. Especially, the composite array electrode shows a higher efficiency than the nonloaded one for the photoelectrocatalytic decomposition of 4-chlorophenol. The improved photoeletrocatalytic activity of the TiO2/Cu2O composite array electrode is attributed to the synergistic effect of Cu2O nanoparticles and TiO2nanotube arrays. The Cu2O nanoparticles could enhance the efficiency of photon harvesting and reduce the chances of electron-hole recombination by sending the electrons to the conduction band of TiO2nanotubes. The accumulated electrons in the conduction band of TiO2nanotubes would reduce oxygen to form peroxides for enhanced advanced oxidation. The byproducts were identified by high- performance liquid chromatography.
Original languageEnglish
Pages (from-to)858-863
Number of pages6
JournalEnvironmental Science and Technology
Volume43
Issue number3
DOIs
Publication statusPublished - 1 Feb 2009
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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