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Decomposition of dexamethasone by gamma irradiation: Kinetics, degradation mechanisms and impact on algae growth

文献类型： 外文期刊

作者： Guo, Zhaobing 1 ; Guo, Anke 1 ; Guo, Qingjun 3 ; Rui, Maoling 1 ; Zhao, Yongfu; Zhang, Haixiao 1 ; Zhu, Shengnan 1 ;

作者机构： 1.Nanjing Univ Informat Sci & Technol, Sch Environm Sci & Engn, Nanjing 210044, Jiangsu, Peoples R China

2.Collaborat Innovat Ctr Atmospher Environm & Equip, Nanjing 210044, Jiangsu, Peoples R China

3.Chinese Acad Sci, Inst Geog Sci & Nat R

关键词： Gamma irradiation;Dexamethasone;Removal mechanism;Kinetics;Algae growth

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.273； 五年影响因子：11.529 ）

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收录情况： SCI

摘要： Gamma-irradiation induced degradation of dexamethasone (DEX) in aqueous solution was investigated under different conditions. The results indicate that low-concentration DEX could be effectively decomposed during gamma irradiation. H2O2 and Fenton reagent were favorable for DEX radiolytic removal. However, DEX radiolysis was restrained in the presence of NO3-, CO32-, 2-propanol and tert-butanol. DEX radiolytic degradation was in accordance with the pseudo first-order reaction kinetics. The rate constant ratios of OH, e(aq)(-) and H-center dot towards DEX degradation could be calculated as k(OH): k(eaq-): k(H) = 10:1.5:1. Besides, it is observed that radiolytic degradation of DEX restrained algae growth. Finally, LC-MS analysis was employed to identify the intermediates and Gaussian 03 software was used to optimize DEX geometry structure. On the basis of LC-MS analysis and Gaussian calculations, we attributed DEX radiolytic removal to (OH)-O-center dot oxidation, (OH)-O-center dot radical substitution and direct cleavage of DEX molecules. (C) 2016 Elsevier B.V. All rights reserved.

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