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Study on the Simulated Sunlight Photolysis Mechanism of Ketoprofen: Role of Superoxide Anion Radical, Transformation Byproducts, and Ecotoxicity Assessment

Abstract

The aim of this study was to investigate the photolysis mechanism of Ketoprofen (KET) under simulated sunlight. The results demonstrated that the photolysis of KET aligned well with pseudo first-order kinetics. Radical scavenging experiments and dissolved oxygen experiments revealed that the superoxide anion radical (O2•−) played a primary role during the photolytic process in pure water. Bicarbonate slightly increased the photodegradation of KET through generating carbonate radicals, while DOM inhibited the photolysis via both attenuating light and competing radicals. Moreover, Zhujiang River water inhibited KET phototrasformation. Potential KET degradation pathways were proposed based on the identification of products using LC/MS/MS and GC/MS techniques. The theoretical prediction of reaction sites were derived from Frontier Electron Densities (FEDs), which primarily involved the KET decarboxylation reaction. The ecotoxicity of the treated solutions were evaluated by employing Daphnia magna and V. fischeri as biological indicators. Ecotoxicity was also hypothetically predicted through the “ecological structure-activity relationships” (ECOSAR) program, which revealed that toxic products might be generated during the photolysis process.

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Publication details

The article was received on 08 Mar 2017, accepted on 27 Jun 2017 and first published on 04 Jul 2017


Article type: Paper
DOI: 10.1039/C7EM00111H
Citation: Environ. Sci.: Processes Impacts, 2017, Accepted Manuscript
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    Study on the Simulated Sunlight Photolysis Mechanism of Ketoprofen: Role of Superoxide Anion Radical, Transformation Byproducts, and Ecotoxicity Assessment

    Y. Wang, W. Deng, F. Wang, Y. Su, Y. Feng, P. Chen, J. Ma, H. Su, Y. Liu, W. Lv, G. Liu and K. Yao, Environ. Sci.: Processes Impacts, 2017, Accepted Manuscript , DOI: 10.1039/C7EM00111H

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