Photocatalytic degradation of aqueous 4-chlorophenol by silica-immobilized polyoxometalates

被引：106

作者：

Yue, B ^{[1
]}

Zhou, Y ^{[1
]}

Xu, JY ^{[1
]}

Wu, ZZ ^{[1
]}

Zhang, XA ^{[1
]}

Zou, YF ^{[1
]}

Jin, SL ^{[1
]}

机构：

[1] Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2002年 / 36卷 / 06期

关键词：

D O I：

10.1021/es011038u

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The degradation of 4-chlorophenol with near-UV light by silica-immobilized polyoxometalate (POM-in-SiO2) catalysts has been studied. The silica-immobilized Na6W7O24 (SW7), H4W10O32(SW10), H3PW12O40(SPW12), and H6P2W18O62 (SP2WI8) were prepared by means of the sol-gel hydrothermal technique through the hydrolysis of tetraethoxysilane in aqueous solution of the corresponding polyoxometalate, respectively. The degradation of 4-chlorophenol was monitored by measuring Cl- and CO2 concentrations and analyzing reaction intermediates by GC/MS analysis. During irradiation, 4-chlorophanol first dechlorinated to form hydroquinone and p-benzoquinone, and then these intermediates further mineralized to form CO2 and H2O. The degree to which 4-chlorophenol was mineralized by photocatalytic oxidation was investigated. Results indicate less than 15% for SW7 but nearly complete mineralization for SW10 after 60 min of photoirradiation. The present studies suggest that POM-In-SiO2 catalysts may be a novel type of photocatalyts for the purification of the environmentally chlorophenol-contaminated water.

引用

页码：1325 / 1329

页数：5

共 50 条

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[42] ENHANCED RATES OF PHOTOCATALYTIC DEGRADATION OF AN AZO-DYE USING SNO2/TIO2 COUPLED SEMICONDUCTOR THIN-FILMS [J].