Photocatalytic decolorization of methyl orange in aqueous medium of TiO2 and Ag-TiO2 immobilized on γ-Al2O3

被引：56

作者：

Chen, LC ^{[1
]}

Tsai, FR ^{[1
]}

Huang, CM ^{[1
]}

机构：

[1] Kun Shan Univ Technol, Dept Environm Engn, Tainan 710, Taiwan

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2005年 / 170卷 / 01期

关键词：

photocatalytic; methyl orange; Ag; TiO2; gamma-Al2O3;

D O I：

10.1016/j.jphotochem.2004.07.012

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：

TiO2, synthesized through a sol-gel procedure with acetylacetone chelating agent, was immobilized on gamma-Al2O3 and deposited with photoreduced Ag. The prepared catalysts were characterized and applied for decolorization of methyl orange (MO). The photoactivity of TiO2/gamma-Al2O3 is affected by the H2O/Ti molar ratio applied in the sol-gel process. The optimal calcination temperatures of the TiO2/gamma-Al2O3 locate in the ranges from 723 to 773 K and 773 to 873 K as TiO2 prepared with H2O/Ti of 10 and 1, respectively. Incorporating photoreduced Ag to TiO2/gamma-Al2O3 leads to reduction reaction of methyl orange in addition to oxidation reaction, and yields a significant increment in decolorization efficiency. The optimal Ag load on TiO2/gamma-Al2O3 and dosage of Ag/TiO2/gamma-Al2O3 in the photodecolorization of methyl orange are about 1.0% and 1.0 g/L, respectively. The photocatalytic rate is proportional to the Ag load and catalyst dosage raised to the powers of 0.45 and 0.71, respectively. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：7 / 14

页数：8

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