Diclofenac (DCF) is one of the most frequently detected pharmaceuticals in various water samples. This paper studied the effects of aquatic environmental factors (pH, temperature and dissolved organic matter) on photodegradation of DCF under simulated sunlight. The results demonstrate that degradation pathways proceed via pseudo first-order kinetics in all cases and the photodegradation of DCF by simulated sunlight. Thermodynamic study indicated that the photodegradation course is spontaneous, exothermic and irreversible. The rate constant gradually increased when the pH increased from 3 to 5, then decreased when the pH increased from 5 to 8, and finally increased when the pH further increased from 8 to 12. Humic acid inhibited the photodegradation of DCF. Three kinds of main degradation products were observed by high performance liquid chromatography/mass spectrometry and the degradation pathways were suggested. A toxicity test using Photobacterium phosphoreum T3 Sp indicated the generation of some more toxic products than DCF.
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Research Article|
February 21 2017
Photodegradation of diclofenac in aqueous solution by simulated sunlight irradiation: kinetics, thermodynamics and pathways Available to Purchase
N. Zhang;
1Postdoctoral Research Base, Henan Institute of Science and Technology, Key Laboratory for Crops Pest Management of Xinxiang, Xinxiang 453003, China
2Center for Postdoctoral Studies, Postdoctors of Henan Normal University, Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, Ministry of Education, Jianshe Road, Xinxiang 453007, China
E-mail: [email protected]
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J. M. Li;
J. M. Li
1Postdoctoral Research Base, Henan Institute of Science and Technology, Key Laboratory for Crops Pest Management of Xinxiang, Xinxiang 453003, China
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G. G. Liu;
G. G. Liu
2Center for Postdoctoral Studies, Postdoctors of Henan Normal University, Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, Ministry of Education, Jianshe Road, Xinxiang 453007, China
3Faculty of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
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X. L. Chen;
X. L. Chen
1Postdoctoral Research Base, Henan Institute of Science and Technology, Key Laboratory for Crops Pest Management of Xinxiang, Xinxiang 453003, China
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K. Jiang
K. Jiang
2Center for Postdoctoral Studies, Postdoctors of Henan Normal University, Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, Ministry of Education, Jianshe Road, Xinxiang 453007, China
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Water Sci Technol (2017) 75 (9): 2163–2170.
Article history
Received:
November 09 2016
Accepted:
January 25 2017
Citation
N. Zhang, J. M. Li, G. G. Liu, X. L. Chen, K. Jiang; Photodegradation of diclofenac in aqueous solution by simulated sunlight irradiation: kinetics, thermodynamics and pathways. Water Sci Technol 12 May 2017; 75 (9): 2163–2170. doi: https://doi.org/10.2166/wst.2017.075
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