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Titolo:
Mechanistic study of the TiO2-assisted photodegradation of squarylium cyanine dye in methanolic suspensions exposed to visible light
Autore:
Wu, TX; Liu, GM; 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 Iwaki Meisei Univ, Frontier Res Ctr Earth Environm Protect, Hino, Tokyo 191, Japan Iwaki Meisei Univ Hino Tokyo Japan 191 nm Protect, Hino, Tokyo 191, Japan Concordia Univ, Dept Chem & Biochem, Montreal, PQ H3G 1M8, Canada Concordia Univ Montreal PQ Canada H3G 1M8 m, Montreal, PQ H3G 1M8, Canada
Titolo Testata:
NEW JOURNAL OF CHEMISTRY
fascicolo: 2, volume: 24, anno: 2000,
pagine: 93 - 98
SICI:
1144-0546(200002)24:2<93:MSOTTP>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
AQUEOUS TIO2 DISPERSIONS; PHOTOASSISTED DEGRADATION; ENVIRONMENTAL PHOTOCHEMISTRY; PHOTOCATALYTIC PRODUCTION; SEMICONDUCTOR SURFACES; ORGANIC PEROXIDES; RHODAMINE-B; PARTICLES; H2O2; IRRADIATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
25
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:
T.X. Wu et al., "Mechanistic study of the TiO2-assisted photodegradation of squarylium cyanine dye in methanolic suspensions exposed to visible light", NEW J CHEM, 24(2), 2000, pp. 93-98

Abstract

Details of the degradation pathway(s) of squarylium cyanine (SQ) dye in methanolic TiO2 dispersions under visible light irradiation were probed in anattempt to more clearly understand the photodegradation mechanism of dye under visible radiation. For SQ, degradation begins by cleavage of the C=C double bond to yield ultimately the final product 1-sulfopropyl-3,3-dimethyl-5-bromoindolenium-2-one. A considerable amount of H2O2 is also formed during degradation through reduction (but not through dismutation) of the superoxide radical anion. In comparison with the previous results in aqueous media, it is evidenced for the first time that the pathway for the TiO2-assisted photodegradation of SQ using visible light irradiation is initiated by aseries of complex reactions involving the dye cation radical SQ(.+) with dissolved dioxygen and does not implicate any of the photogenerated active oxygen species such as (OH)-O-., O-2(.-) and (OOH)-O-. radicals. These results clarify the previous equivocal conceptions on the details of the reaction between dye cationic radical and oxygen species.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 20:27:56