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Titolo:
Photoassisted degradation of dye pollutants. 8. Irreversible degradation of alizarin red under visible light radiation in air-equilibrated aqueous TiO2 dispersions
Autore:
Liu, GM; Wu, TX; Zhao, JC; Hidaka, H; Serpone, N;
Indirizzi:
Chinese Acad Sci, Inst Photog Chem, Beijing 100101, Peoples R China Chinese Acad Sci Beijing Peoples R China 100101 100101, Peoples R China Iwaki,Meisei Univ, Frontier Res Ctr Earth Environm Protect, Hino, Tokyo 191 Iwaki Meisei Univ Hino Tokyo Japan 191 Environm Protect, Hino, Tokyo 191 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:
ENVIRONMENTAL SCIENCE & TECHNOLOGY
fascicolo: 12, volume: 33, anno: 1999,
pagine: 2081 - 2087
SICI:
0013-936X(19990615)33:12<2081:PDODP8>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-TRANSFER; RHODAMINE-B; PARTICLES; PHOTODEGRADATION; IRRADIATION; PHOTOCATALYSIS; SURFACTANTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
31
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., "Photoassisted degradation of dye pollutants. 8. Irreversible degradation of alizarin red under visible light radiation in air-equilibrated aqueous TiO2 dispersions", ENV SCI TEC, 33(12), 1999, pp. 2081-2087

Abstract

Alizarin red undergoes rapid photoassisted decomposition in air-equilibrated aqueous TiO2 dispersions under visible light radiation (lambda > 420 nm). Proton NMR, chemical oxygen demand (CODCr), UV-visible, IR, CC-MS, and spin-trapping ESR spectroscopic techniques were employed to obtain details ofthe photodegradation of alizarin red. Peroxides and carbonyl species are the first intermediates observed during the process. The major component of the peroxides produced is H2O2, and no organoperoxides were detected. We have also confirmed that in addition to CO2 and to smaller carbonyl species the principal intermediate produced is phthalic acid, which is unable to degrade further because it does not absorb the actinic visible light radiation(lambda > 420 nm). The photodegradation kinetics are discussed in terms ofthe Langmuir-Hinshelwood model, a case of saturation type kinetics. A mechanism for the photoassisted degradation of alizarin red mediated by TiO2 particles under visible light radiation is proposed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 14:49:39