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Citation: Liu Shou-Xin, Sun Cheng-Lin. Mechanism of Silver Modification for the Enhanced Photocatalytic Activity of Cr(VI) Reduction on TiO₂ Photocatalyst[J]. Acta Physico-Chimica Sinica, ;2004, 20(04): 355-359. doi: 10.3866/PKU.WHXB20040404 shu

Mechanism of Silver Modification for the Enhanced Photocatalytic Activity of Cr(VI) Reduction on TiO₂ Photocatalyst

1.
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian　116023;Northeast Forestry University, Harbin　150040

Received Date: 25 September 2003
Available Online: 15 April 2004

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＋.
- Silver;Titanium dioxide;Photocatalytic reduction;Hexavalent chromium; Mechanism
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沈阳化工大学材料科学与工程学院沈阳 110142

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Mechanism of Silver Modification for the Enhanced Photocatalytic Activity of Cr(VI) Reduction on TiO2 Photocatalyst

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通讯作者: 陈斌, bchen63@163.com

Mechanism of Silver Modification for the Enhanced Photocatalytic Activity of Cr(VI) Reduction on TiO₂ Photocatalyst