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化学进展 2012, Vol. 24 Issue (07): 1388-1397 前一篇   后一篇

• 综述与评论 •

天然水体中可溶性有机质的自由基光化学行为

邰超*1,2, 李雁宾2, 阴永光2,3, 蔡勇2, 江桂斌3   

  1. 1. 河南理工大学资源环境学院 焦作 454000;
    2. Department of Chemistry and Biochemistry, Florida International University Miami USA 33199;
    3. 环境化学与生态毒理国家重点实验室 中国科学院生态环境研究中心 北京 100075
  • 收稿日期:2011-09-01 修回日期:2011-11-01 出版日期:2012-07-24 发布日期:2012-06-30
  • 通讯作者: 邰超 E-mail:taichao@hpu.edu.cn
  • 基金资助:

    国家自然科学基金项目(No.21120102040, 20907062, 40701160)资助

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导出 被引次数 ( 12 | 6 )

Free Radical Photochemistry of Dissolved Organic Matter in Natural Water

Tai Chao1,2, Li Yanbin2, Yin Yongguang2,3, Cai Yong2, Jiang Guibin3   

  1. 1. Institute of Resource and Environment, Henan Polytechnic University, Jiaozuo 454000, China;
    2. Department of Chemistry and Biochemistry, Florida International University, Miami USA 33199;
    3. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center of Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100075, China
  • Received:2011-09-01 Revised:2011-11-01 Online:2012-07-24 Published:2012-06-30
可溶性有机质在天然水体中广泛分布,是全球碳循环的重要组成部分。大部分的可溶性有机质含有苯环、羧基、羟基和羰基等发色团,能够吸收特定波长的太阳光,产生水合电子、单线态氧、羟基自由基等活性自由基,从而影响天然水体污染物的光化学转化以及降解过程。本文综述了20世纪90年代以来可溶性有机质的自由基光化学行为以及其在水体污染物转化中的作用方面的研究进展,并探讨了今后研究中应该关注的问题。
关键词： 天然水体, 可溶性有机质, 光化学, 自由基, 光降解
Dissolved organic matter (DOM) exists widely in the natural water. It is one of the largest active pools of organic carbon on earth and hence plays an important role in the global carbon cycling. As it contains a large number of chromophores, such as benzene ring, carboxyl, hydroxy, carbonyl, etc., it can adsorb sunlight at certain wavelength regions of the spectrum. A variety of reactive free radicals, such as hydroxyl radicals, singlet oxygen, and hydrated electron, could be generated during this process. These reactive free radicals could play an important role in the photo-transformation and photo-degradation of contaminants in the natural water. In different natural water, the generation of reactive free radicals is very different, resulting the mechanism and pathway of photo-transformation of various contaminats in natural water. This paper reviews the DOM-mediated generating pathways of major reactive radicals, including hydroxyl radicals, singlet oxygen, hydrated electron and excited triplet states of the CDOM. Then influences of them on the photo-transformation and photo-degradation of various contaminants, inculding inorganic ion, methylmercury, polyaromatic hydrocarbon, phenols, and pesticides, etc., in the natural water are discussed. The necessary works in the future research are also briefly outlined. Contents
1 Introduction
2 Free radical photochemistry of dissolved organic matter
2.1 Hydroxyl radicals
2.2 Singlet oxygen
2.3 Hydrated electron
2.4 Excited triplet states of dissolved organic matter
3 Influence of dissolved organic matter on the photo-transformation of various contaminants
3.1 Inorganic ions
3.2 Methyl mercury
3.3 PAHs
3.4 Phenols
3.5 Pesticides
3.6 Other pollutants
4 Conclusions and outlook
Key words: natural water, dissolved organic matter, photochemistry, free radicals, photo-degradation

中图分类号: 

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