Photooxidation pathway of sulforhodamine-B.: Dependence on the adsorption mode on TiO2 exposed to visible light radiation

被引:264
作者
Liu, GM
Li, XZ
Zhao, JC
Hidaka, H
Serpone, N
机构
[1] Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Lab Photochem, Beijing 100080, Peoples R China
[2] Meisei Univ, Frontier Res Ctr Earth Environm Protect, Hino, Tokyo 191, Japan
关键词
D O I
10.1021/es001064c
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The temporal course of the photooxidation of sulforhodamine-B (SRB) in aqueous media illuminated by visible wavelengths in the presence of TiO2 has been examined to determine the nature of the intermediate species produced and to explore the operative reaction pathway(s). Two pathways are described to account for the differences in the final photooxidation products whose nature depends on the different modes of adsorption of the dye on the metaloxide mediator. In the SRB/TiO2 system, when SRB is adsorbed on the positively charged TiO2 particle surface through a sulfonate group cleavage of the SRB chromophore structure predominates and N-de-ethylation occurs only to a slight extent with the major photooxidation products being diethylamine and carbon dioxide. in the presence of the anionic dodecylbenzenesulfonate surfactant DBS, when SRB is near the negatively charged DBS/TiO2 interface through the positive diethylamine group N-de-ethylation occurs preferentially before destruction of the structure with the major products being acetaldehyde and carbon dioxide.
引用
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页码:3982 / 3990
页数:9
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