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论文类型：期刊论文

发表时间：2008-06-25

发表刊物：JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY

收录刊物：SCIE

卷号：197

期号：2-3

页面范围：382-388

ISSN号：1010-6030

关键字：atrazine; Fe(III)-citrate complex; photodegradation; hydroxyl radical

摘要：The photodegradation of atrazine in aqueous solutions containing citrate and Fe(III) was studied under Xe lamp irradiation on a time scale of hours. It was found that the presence of Fe(III)-citrate complex enhanced the photodegradation rate of atrazine as a result of degrees OH attack. Atrazine photodegradation followed first-order reaction kinetics and the rate depended upon pH and light intensity. High citrate concentrations led to increased photodegradation of atrazine due to the fact that citrate not only acted as a carboxylate ligand but also a reductant of Fe(III). The interaction of Fe(III) with citrate was characterized using UV-visible absorption and Fourier-transform infrared (FTIR) spectroscopy, indicating that the hydrogen ions on the carboxyl groups were exchanged for Fe(III) ions. On the basis of these results, a reaction scheme was proposed in which the cycling of iron and carbon, the depletion of citrate and O-2, and the formation of reactive oxygen species (ROS) were involved. (C) 2008 Elsevier B.V. All rights reserved.