中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
New insight into photochemical oxidation of Fe(II): The roles of Fe(III) and reactive oxygen species

文献类型:期刊论文

作者Wang, Zhaohui1,2; Liu, Jianshe1
刊名CATALYSIS TODAY
出版日期2014-04-01
卷号224页码:244-250
关键词Environmental Photochemistry Kinetic Modeling Electron Spin Resonance Photosensitization
ISSN号0920-5861
DOI10.1016/j.cattod.2013.09.063
英文摘要Photooxidation of Fe(II) at acidic pH occurs in photocatalytic processes of Fe(III) species, but its reaction mechanism is not well understood. The kinetics of Fe(II) oxidation in irradiated aqueous solutions at pH 3.0 have been investigated in terms of kinetic modeling approach, rate constant estimation and the significance of various oxidation pathways. Fe(II) oxidation kinetics strongly rely on the availability of UV light, Fe(III) ions and oxygen. The presence of a portion of Fe(III) in Fe(II)-containing solutions favors the rapid oxidation of Fe(II). At high concentration of Fe(II), excitation of Fe(III) species may be quenched by Fe(II) in deaerated systems or may sensitize Fe(II) oxygenation under oxic conditions. By incorporation of this photosensitization pathway, the established model in this study is shown to be able to adequately describe the oxidation of Fe(II) at pH 3.0. Sensitivity analysis indicates that photolysis of Fe(III) species is critically important for overall Fe(II) oxidation kinetics. Fe(III)-catalyzed oxygenation of Fe(II), and oxidation of Fe(II) by HO2 center dot and center dot OH also exerts a marked impact on the oxidation of Fe(II). Therefore, Fe(III)-catalyzed oxygen activation and their secondary reactive oxygen species (ROS) account for the oxidation kinetics of Fe(II) at acidic pH. (C) 2013 Elsevier B.V. All rights reserved.
语种英语
WOS记录号WOS:000331724200032
出版者ELSEVIER SCIENCE BV
源URL[http://ir.iccas.ac.cn/handle/121111/50695]  
专题中国科学院化学研究所
通讯作者Wang, Zhaohui
作者单位1.Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China
2.Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
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Wang, Zhaohui,Liu, Jianshe. New insight into photochemical oxidation of Fe(II): The roles of Fe(III) and reactive oxygen species[J]. CATALYSIS TODAY,2014,224:244-250.
APA Wang, Zhaohui,&Liu, Jianshe.(2014).New insight into photochemical oxidation of Fe(II): The roles of Fe(III) and reactive oxygen species.CATALYSIS TODAY,224,244-250.
MLA Wang, Zhaohui,et al."New insight into photochemical oxidation of Fe(II): The roles of Fe(III) and reactive oxygen species".CATALYSIS TODAY 224(2014):244-250.

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来源:化学研究所

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