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Photodegradation of diclofenac in aqueous solution by simulated sunlight irradiation: kinetics, thermodynamics and pathways.
Water Sci Technol. 2017 May; 75(9-10):2163-2170.WS

Abstract

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.

Authors+Show Affiliations

Postdoctoral Research Base, Henan Institute of Science and Technology, Key Laboratory for Crops Pest Management of Xinxiang, Xinxiang 453003, China E-mail: 29164616@qq.com; Center 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.Postdoctoral Research Base, Henan Institute of Science and Technology, Key Laboratory for Crops Pest Management of Xinxiang, Xinxiang 453003, China E-mail: 29164616@qq.com.Center 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; Faculty of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.Postdoctoral Research Base, Henan Institute of Science and Technology, Key Laboratory for Crops Pest Management of Xinxiang, Xinxiang 453003, China E-mail: 29164616@qq.com.Center 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.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28498129

Citation

Zhang, N, et al. "Photodegradation of Diclofenac in Aqueous Solution By Simulated Sunlight Irradiation: Kinetics, Thermodynamics and Pathways." Water Science and Technology : a Journal of the International Association On Water Pollution Research, vol. 75, no. 9-10, 2017, pp. 2163-2170.
Zhang N, Li JM, Liu GG, et al. Photodegradation of diclofenac in aqueous solution by simulated sunlight irradiation: kinetics, thermodynamics and pathways. Water Sci Technol. 2017;75(9-10):2163-2170.
Zhang, N., Li, J. M., Liu, G. G., Chen, X. L., & Jiang, K. (2017). Photodegradation of diclofenac in aqueous solution by simulated sunlight irradiation: kinetics, thermodynamics and pathways. Water Science and Technology : a Journal of the International Association On Water Pollution Research, 75(9-10), 2163-2170. https://doi.org/10.2166/wst.2017.075
Zhang N, et al. Photodegradation of Diclofenac in Aqueous Solution By Simulated Sunlight Irradiation: Kinetics, Thermodynamics and Pathways. Water Sci Technol. 2017;75(9-10):2163-2170. PubMed PMID: 28498129.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photodegradation of diclofenac in aqueous solution by simulated sunlight irradiation: kinetics, thermodynamics and pathways. AU - Zhang,N, AU - Li,J M, AU - Liu,G G, AU - Chen,X L, AU - Jiang,K, PY - 2017/5/13/entrez PY - 2017/5/13/pubmed PY - 2017/9/15/medline SP - 2163 EP - 2170 JF - Water science and technology : a journal of the International Association on Water Pollution Research JO - Water Sci. Technol. VL - 75 IS - 9-10 N2 - 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. SN - 0273-1223 UR - https://www.unboundmedicine.com/medline/citation/28498129/Photodegradation_of_diclofenac_in_aqueous_solution_by_simulated_sunlight_irradiation:_kinetics_thermodynamics_and_pathways_ L2 - https://iwaponline.com/wst/article-lookup/doi/10.2166/wst.2017.075 DB - PRIME DP - Unbound Medicine ER -