Tungsten-doped TiO2 vs pure TiO2 photocatalysts:: Effects on photobleaching kinetics and mechanism

被引：107

作者：

Couselo, Natalia ^{[1
]}

Einschlag, Fernando S. Garcia ^{[2
]}

Candal, Roberto J. ^{[1
]}

Jobbagy, Matias ^{[1
]}

机构：

[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, INQUIMAE, RA-1428 Buenos Aires, DF, Argentina

[2] Natl Univ La Plata, Fac Ciencias Exactas, INIFTA, RA-1900 La Plata, Argentina

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 04期

关键词：

D O I：

10.1021/jp0769781

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Sol gel prepared tungsten (VI) doped TiO2 powders were evaluated as photocatalysts for crystal violet (CV) bleaching under UV irradiation, in the presence of oxygen. The incorporation of the hexavalent cation affects both surface and bulk properties. The optimum activity observed results from the competition between higher surface areas and lower specific activities per adsorption site. At pH 4.0, doped particles share a common photodegradation mechanism, where the relative contribution of the aromatic structure rupture over the loss of terminal methyl groups (N-demethylation) is more relevant than in the case of non-doped titania. This behavior can be minimized shifting the pH into basic condition.

引用

页码：1094 / 1100

页数：7

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