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Titolo:
Photooxidation pathway of sulforhodamine-B. Dependence on the adsorption mode on TiO2 exposed to visible light radiation
Autore:
Liu, GM; Li, XZ; Zhao, JC; Hidaka, H; Serpone, N;
Indirizzi:
Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Lab Photochem, Beijing 100080, Peoples R China Chinese Acad Sci Beijing Peoples R China 100080 100080, Peoples R China Meisei Univ, Frontier Res Ctr Earth Environm Protect, Hino, Tokyo 191, Japan Meisei Univ Hino Tokyo Japan 191 Environm Protect, Hino, Tokyo 191, Japan
Titolo Testata:
ENVIRONMENTAL SCIENCE & TECHNOLOGY
fascicolo: 18, volume: 34, anno: 2000,
pagine: 3982 - 3990
SICI:
0013-936X(20000915)34:18<3982:PPOSDO>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
DYE POLLUTANTS; PHOTOASSISTED DEGRADATION; RHODAMINE-B; TIO2-ASSISTED PHOTODEGRADATION; ENVIRONMENTAL PHOTOCHEMISTRY; SEMICONDUCTOR SURFACES; DISPERSIONS; IRRADIATION; OXIDATION; WATER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Zhao, JC Chinese Acad Sci, Inst Photog Chem, Beijing 100101, Peoples R China Chinese Acad Sci Beijing Peoples R China 100101 Peoples R China
Citazione:
G.M. Liu et al., "Photooxidation pathway of sulforhodamine-B. Dependence on the adsorption mode on TiO2 exposed to visible light radiation", ENV SCI TEC, 34(18), 2000, pp. 3982-3990

Abstract

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 describedto 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 theSRB 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.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 00:05:53