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题名: Mechanistic Studies of TiO2 Photocatalysis and Fenton Degradation of Hydrophobic Aromatic Pollutants in Water
作者: Gong, Yuanzheng1, 2; Yang, Chun1, 2; Ji, Hongwei1, 2; Chen, Chuncheng1, 2; Ma, Wanhong1, 2; Zhao, Jincai1, 2
关键词: NIH shift ; photochemistry ; hydroxylation of aromatics ; reaction mechanisms ; water chemistry
刊名: CHEMISTRY-AN ASIAN JOURNAL
发表日期: 2016-12-19
卷: 11, 期:24, 页:3568-3574
收录类别: SCI
英文摘要: HO-adduct radicals have been investigated and confirmed as the common initial intermediates in TiO2 photocatalysis and Fenton degradations of water-insoluble aromatics. However, the evolution of HO-adduct radicals to phenols has not been completely clarified. When 4-d-toluene and p-xylene were degraded by TiO2 photocatalysis and Fenton reactions, respectively, a portion of the 4-deuterium or 4-CH3 group (18-100%) at the attacked ipso position shifted to the adjacent position of the ring in the formed phenols (NIH shift; NIH is short for the National Institutes of Health, to honor the place where this phenomenon was first discovered). The results, combined with the observation of a key dienyl cationic intermediate by in situ attenuated total reflectance FTIR spectroscopy, indicate that, for the evolution of HO-adduct radicals, a mixed mechanism of both the carbocation intermediate pathway and O-2-capturing pathway occurs in both aqueous TiO2 photocatalysis and aqueous Fenton reactions.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/36536
Appears in Collections:光化学实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Key Lab Photochem, Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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