Structure-dependent photocatalytic degradation of polychlorobiphenyls in a TiO2 aqueous system

被引:13
作者
DeFelip, E
Ferri, F
Lupi, C
Trieff, NM
Volpi, F
diDomenico, A
机构
[1] IST SUPER SANITA,COMPARAT TOXICOL & ECOTOXICOL LAB,I-00161 ROME,ITALY
[2] UNIV TEXAS,MED BRANCH,DEPT PREVENT MED & COMMUNITY HLTH,GALVESTON,TX 77550
关键词
polychlorobiphenyls; photodegradation; TiO2; photocatalysis; aqueous photochemistry;
D O I
10.1016/0045-6535(96)00333-5
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Three positional isomers for each polychlorobiphenyl (PCB) homologous group tetra-, penta-, and hexachlorosubstituted were irradiated in a TiO2 (anatase) semiconductor aqueous suspension. Parent PCB disappearance was studied as a function of irradiation time, and a correlation between isomer substitution pattern and the photodegradative behavior was shown. In each group, the slowest disappearance trend was exhibited by the isomer with unsubstituted ortho positions, thereby capable of adapting into a planar structural configuration with minimum (estimated) energy requirement. In general, photodegradation rate increased with increasing degree of ortho chlorosubstitution. Copyright (C) 1996 Published by Elsevier Science Ltd
引用
收藏
页码:2263 / 2271
页数:9
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