Photophysical and photocatalytic properties of TiO2-Cr sol-gel prepared semiconductors

被引：56

作者：

Lopez, R. ^{[1
]}

Gomez, R. ^{[1
]}

Oros-Ruiz, S. ^{[2
]}

机构：

[1] Univ Autonoma Metropolitana Iztapalapa, Dept Quim, ECOCATAL, Mexico City 09340, DF, Mexico

[2] Univ Autonoma San Luis Potosi, San Luis Potosi, Slp, Mexico

来源：

CATALYSIS TODAY | 2011年 / 166卷 / 01期

关键词：

Photocatalysts; Sol-gel; Phenol photodegradation; Chromium-titania photo catalysts; XPS chromium-titania; UV-vis chromium-titania spectra; HETEROGENEOUS PHOTOCATALYSIS; PHOTOELECTRON-SPECTROSCOPY; TITANIUM-DIOXIDE; AQUEOUS-SOLUTION; METAL-IONS; X-RAY; DEGRADATION; UV; CATALYSTS; WATER;

D O I：

10.1016/j.cattod.2011.01.010

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Chromium-titania photocatalysts were prepared at different contents in chromium oxide (0.1-5.0 wt.%) by gelling titanium alkoxide and chromium nitrate. Nanostructured titania with crystallite sizes between 22 and 40nm and high specific surface areas (68-113m(2)/g) were obtained in solids annealed at 500 degrees C. The determination of the band gap energy showed a shift to the visible region in samples containing high amounts of chromium oxide (3.8-1.8 eV). XPS spectroscopy evidenced the presence of Cr(III) and Cr(VI) in the annealed semiconductors. The photocatalyst with low doping content (0.1 wt.% Cr) was observed to provide effective Cr-Ti interaction and allow the maximum photoactivity. (C) 2011 Elsevier B. V. All rights reserved.

引用

页码：159 / 165

页数：7

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