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题名: Mechanism of silver modification for the enhanced photocatalytic activity of Cr(VI) reduction on TiO2 pholocatalyst
作者: Liu, SX;  Sun, CL
关键词: silver ;  titanium dioxide ;  photocatalytic reduction ;  hexavalent chromium ;  mechanism
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 2004-04-01
DOI: 10.3866/PKU.WHXB20040404
卷: 20, 期:4, 页:355-359
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: 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 +.
关键词[WOS]: TITANIUM-DIOXIDE ;  SUSPENSIONS ;  SYSTEMS ;  POWDER ;  IONS
语种: 英语
WOS记录号: WOS:000220959000004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139311
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.NE Forestry Univ, Harbin 150040, Peoples R China

Recommended Citation:
Liu, SX,Sun, CL. Mechanism of silver modification for the enhanced photocatalytic activity of Cr(VI) reduction on TiO2 pholocatalyst[J]. ACTA PHYSICO-CHIMICA SINICA,2004,20(4):355-359.
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