Oxidative decomposition of rhodamine B dye in the presence of VO2+ and/or Pt(IV) under visible light irradiation: N-deethylation, chromophore cleavage, and mineralization

doi:10.1021/jp063588q

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	Oxidative decomposition of rhodamine B dye in the presence of VO2+ and/or Pt(IV) under visible light irradiation: N-deethylation, chromophore cleavage, and mineralization
	Hu, Xuefeng; Mohamood, Tariq; Ma, Wanhong; Chen, Chuncheng; Zhao, Jincai
刊名	JOURNAL OF PHYSICAL CHEMISTRY B
	2006-12-28
卷号	110 期号:51 页码:26012-26018
ISSN号	1520-6106
DOI	10.1021/jp063588q
英文摘要	In order to make clear the roles of dissolved O-2 in the photocatalytic decomposition of organic pollutants and to discriminate different degradation pathways (N-deethylation, chromophore cleavage, and mineralization) during the degradation of dye, the photodegradation of rhodamine B (RhB) has been investigated using vanadate and/or platinum species as electron acceptors in the presence or absence of O-2 under visible light irradiation. It was found that with VO2+ as electron acceptor, RhB underwent efficient N-deethylation under visible light irradiation and O-2 was found to slow down this process significantly. Little mineralization has been observed in the presence and absence of O-2 in VO2+ systems. By contrast, Pt(IV) resulted in the cleavage of conjugated chromophore structure (bleaching) of RhB dye under the otherwise identical conditions. In this case, the presence of O-2 did not affect the bleaching rate of the dye, but enhanced greatly the mineralization. Both cleavage of conjugated chromophore structure and N-deethylation occurred simultaneously upon the coaction of VO2+ and Pt(IV) under visible light irradiation. The mineralization yield of the combined system was evidently higher than the expected summation of separate ones. TOC, XPS, and ESR results indicate that in the VO2+ and Pt(IV) combined system VO2+ not only oxidized RhB leading to deethylation but also oxidized the reduced Pt(II) to regenerate Pt(IV) leading to the further cleavage of chromophore structure of RhB, which behaved quite different from the separate ones. A mechanism was also proposed to interpret the different pathways for the oxidative photodecomposition of RhB under visible irradiation.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000242974300069
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/59771]
专题	中国科学院化学研究所
通讯作者	Zhao, Jincai
作者单位	Chinese Acad Sci, Key Lab Photochem, Beijing Natl Lab Mol Sci, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Hu, Xuefeng,Mohamood, Tariq,Ma, Wanhong,et al. Oxidative decomposition of rhodamine B dye in the presence of VO2+ and/or Pt(IV) under visible light irradiation: N-deethylation, chromophore cleavage, and mineralization[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2006,110(51):26012-26018.
APA	Hu, Xuefeng,Mohamood, Tariq,Ma, Wanhong,Chen, Chuncheng,&Zhao, Jincai.(2006).Oxidative decomposition of rhodamine B dye in the presence of VO2+ and/or Pt(IV) under visible light irradiation: N-deethylation, chromophore cleavage, and mineralization.JOURNAL OF PHYSICAL CHEMISTRY B,110(51),26012-26018.
MLA	Hu, Xuefeng,et al."Oxidative decomposition of rhodamine B dye in the presence of VO2+ and/or Pt(IV) under visible light irradiation: N-deethylation, chromophore cleavage, and mineralization".JOURNAL OF PHYSICAL CHEMISTRY B 110.51(2006):26012-26018.