H2O-Involved Two-Electron Pathway for Photooxidation of Aldehydes on TiO2: An Isotope Labeling Study

	H2O-Involved Two-Electron Pathway for Photooxidation of Aldehydes on TiO2: An Isotope Labeling Study
	Shi, Tao; Chang, Wei; Zhang, Hongna; Ji, Hongwei; Ma, Wanhong; Chen, Chuncheng; Zhao, Jincai
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2015-03-03
卷号	49 期号:5 页码:3024-3031
英文摘要	Aldehyde pollution has been receiving increasing environmental concern recently. In this study, the photooxidation of aldehydes to carboxylates on the TiO2 surface was studied by an oxygen-isotope-labeling method. The solvent H2O was found to contribute much to the oxygen source of the formed carboxylate, which cannot be explained if the conventional O-2-involved free radical chain reaction is the only mechanism for the photocatalytic oxidation of aldehydes. We also observed that, unlike in the TiO2 photocatalytic system, the aldehyde oxidation in homogeneous solutions initiated by single electron oxidant center dot OH and SO4 center dot- radicals inserted a small O atom of H2O into the product acids. The detailed experiments, combined with DFT calculation, revealed the existence of a new pathway for the oxidation of aldehyde on TiO2, in which, analogous to oxidation of aldehyde by dehydrogenase, the aldehyde undergoes a hydration first and subsequently is oxidized through a two-electron transfer process. The present study highlights the multielectron characteristic of TiO2 photocatalytic oxidation and can have implications for the oxidation of aldehyde in the environment.
收录类别	SCI
语种	英语
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/28264]
专题	化学研究所_光化学实验室
作者单位	Chinese Acad Sci, Beijing Natl Lab Mol Sci, Key Lab Photochem Inst, Inst Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Shi, Tao,Chang, Wei,Zhang, Hongna,et al. H2O-Involved Two-Electron Pathway for Photooxidation of Aldehydes on TiO2: An Isotope Labeling Study[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2015,49(5):3024-3031.
APA	Shi, Tao.,Chang, Wei.,Zhang, Hongna.,Ji, Hongwei.,Ma, Wanhong.,...&Zhao, Jincai.(2015).H2O-Involved Two-Electron Pathway for Photooxidation of Aldehydes on TiO2: An Isotope Labeling Study.ENVIRONMENTAL SCIENCE & TECHNOLOGY,49(5),3024-3031.
MLA	Shi, Tao,et al."H2O-Involved Two-Electron Pathway for Photooxidation of Aldehydes on TiO2: An Isotope Labeling Study".ENVIRONMENTAL SCIENCE & TECHNOLOGY 49.5(2015):3024-3031.