Mechanistic study of the TiO2-assisted photodegradation of squarylium cyanine dye in methanolic suspensions exposed to visible light

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	Mechanistic study of the TiO2-assisted photodegradation of squarylium cyanine dye in methanolic suspensions exposed to visible light
	Wu, TX ; Liu, GM ; Zhao, JC ; Hidaka, H ; Serpone, N
刊名	NEW JOURNAL OF CHEMISTRY
	2000-02-01
卷号	24 期号:2 页码:93-98
ISSN号	1144-0546
英文摘要	Details of the degradation pathway(s) of squarylium cyanine (SQ) dye in methanolic TiO2 dispersions under visible light irradiation were probed in an attempt 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 a series 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.
语种	英语
出版者	GAUTHIER-VILLARS/EDITIONS ELSEVIER
WOS记录号	WOS:000085695900010
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/76503]
专题	中国科学院化学研究所
通讯作者	Zhao, JC
作者单位	1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Lab Photochem, Beijing 100080, Peoples R China 2.Iwaki Meisei Univ, Frontier Res Ctr Earth Environm Protect, Hino, Tokyo 191, Japan 3.Concordia Univ, Dept Chem & Biochem, Montreal, PQ H3G 1M8, Canada
推荐引用方式 GB/T 7714	Wu, TX,Liu, GM,Zhao, JC,et al. Mechanistic study of the TiO2-assisted photodegradation of squarylium cyanine dye in methanolic suspensions exposed to visible light[J]. NEW JOURNAL OF CHEMISTRY,2000,24(2):93-98.
APA	Wu, TX,Liu, GM,Zhao, JC,Hidaka, H,&Serpone, N.(2000).Mechanistic study of the TiO2-assisted photodegradation of squarylium cyanine dye in methanolic suspensions exposed to visible light.NEW JOURNAL OF CHEMISTRY,24(2),93-98.
MLA	Wu, TX,et al."Mechanistic study of the TiO2-assisted photodegradation of squarylium cyanine dye in methanolic suspensions exposed to visible light".NEW JOURNAL OF CHEMISTRY 24.2(2000):93-98.