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Progress in Chemistry 2012, Vol. 24 Issue (07): 1388-1397 Previous Articles   Next Articles

• Review •

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: Revised: Online: Published:
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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

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