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Acta Phys. -Chim. Sin.  2004, Vol. 20 Issue (04): 355-359    DOI: 10.3866/PKU.WHXB20040404
Article     
Mechanism of Silver Modification for the Enhanced Photocatalytic Activity of Cr(VI) Reduction on TiO2 Photocatalyst
Liu Shou-Xin;Sun Cheng-Lin
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023;Northeast Forestry University, Harbin 150040
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Abstract  Under the condition that negative effects of proton starvation and photo-generated electron-hole recombination to the Cr6+ photocatalytic reduction process were minimized for the photocatalytic activities of TiO2 and Ag/TiO2 for Cr6+ reduction were comparatively investigated. Combined with the results of EPR, the mechanism of silver modification for the enhanced photocatalytic reduction of Cr6+ on TiO2 was discussed. The result revealed that Cr6+ reduction by the UV-Ag/TiO2 process was more effective than the UV-TiO2 process under the same conditions. Electron transfer from surface Ti3+ to Cr6+ was the key step for Cr6+ reduction. Cr6+ photocatalytic reduction by directly capturing photo-generated electrons is possible, but it occurs mainly indirectly by getting electrons from surface Ti3+. The higher reduction activity of Ag/TiO2 photocatalyst came mainly from the higher number of surface Ti3+.

Key wordsSilver      Titanium dioxide      Photocatalytic reduction      Hexavalent chromium     
Received: 25 September 2003      Published: 15 April 2004
Corresponding Authors: Sun Cheng-Lin     E-mail: clsun@dicp.ac.cn
Cite this article:

Liu Shou-Xin;Sun Cheng-Lin. Mechanism of Silver Modification for the Enhanced Photocatalytic Activity of Cr(VI) Reduction on TiO2 Photocatalyst. Acta Phys. -Chim. Sin., 2004, 20(04): 355-359.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20040404     OR     http://www.whxb.pku.edu.cn/Y2004/V20/I04/355

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