Photo-oxidation of water sensitized by TiO2 and WO3 in presence of different electron acceptors

被引：0

作者：

Mills, A ^{[1
]}

Valenzuela, MA ^{[1
]}

机构：

[1] Univ Strathclyde, Dept Pure & Appl Chem, Glasgow G1 1XL, Lanark, Scotland

来源：

REVISTA MEXICANA DE FISICA | 2004年 / 50卷 / 03期

关键词：

semiconductor photosynthesis; TiO2; WO3; water oxidation; electron acceptor;

D O I：

暂无

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The photo-oxidation of water is studied in presence of UV-light (lambda < 400 nm) using titanium dioxide (TiO2) and tungsten oxide (WO3 , micro- and nano-crystalline) semiconductors in presence of different sacrificial electron acceptors (SEA): Fe(NO3)(2), Na2S2O8, Ce(SO4)(2), Co[(NH3)(5)Cl]Cl-2, AgNO3, HgCl2 and Cu(NO3)(2). TiO2 is 5 to 10 times more photoactive than WO3 with reference to oxygen evolution. Ag ions are the best of the SEAs, for all the semiconductors tested in the photo-redox process. No oxygen evolution is observed when Hg2+ or Cu2+ ions are used as SEAs. The effect of high (10(-2) Mol dm(-3)) and low (10(-3) mol dm(-3)) SEA concentrations is also studied but no common trend is observed. Instead, each system (i.e., SEA+H2O+Semiconductor) exhibits a different behaviour and the results are rationalised in terms of the spectral and redox potential features of the system.

引用

页码：287 / 296

页数：10

共 45 条

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