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Decomposition of dexamethasone by gamma irradiation: Kinetics, degradation mechanisms and impact on algae growth
Guo, Zhaobing1,2; Guo, Anke1,2; Guo, Qingjun3; Rui, Maoling1,2; Zhao, Yongfu4; Zhang, Haixiao1,2; Zhu, Shengnan1,2
2017
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume307Pages:722-728
Corresponding AuthorGuo, Zhaobing(guozbnuist@163.com) ; Guo, Qingjun(guoqj@igsnrr.ac.cn)
AbstractGamma-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.
KeywordGamma irradiation Dexamethasone Removal mechanism Kinetics Algae growth
DOI10.1016/j.cej.2016.08.138
WOS KeywordAQUEOUS-SOLUTION ; RAY IRRADIATION ; RADIATION ; REMOVAL ; WATER ; EXPOSURE ; ATRAZINE
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41373023] ; National Natural Science Foundation of China[21473092] ; Jiangsu Province 333 talent ; Priority Academic Program Development of Jiangsu Higher Education Institutions
Funding OrganizationNational Natural Science Foundation of China ; Jiangsu Province 333 talent ; Priority Academic Program Development of Jiangsu Higher Education Institutions
WOS Research AreaEngineering
WOS SubjectEngineering, Environmental ; Engineering, Chemical
WOS IDWOS:000387298200075
PublisherELSEVIER SCIENCE SA
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Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/65831
Collection中国科学院地理科学与资源研究所
Corresponding AuthorGuo, Zhaobing; Guo, Qingjun
Affiliation1.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 Resources Res, Ctr Environm Remediat, Beijing 100101, Peoples R China
4.Jiangsu Acad Agr Sci, Inst Applicat Atom Energy Agr, Nanjing 210014, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Guo, Zhaobing,Guo, Anke,Guo, Qingjun,et al. Decomposition of dexamethasone by gamma irradiation: Kinetics, degradation mechanisms and impact on algae growth[J]. CHEMICAL ENGINEERING JOURNAL,2017,307:722-728.
APA Guo, Zhaobing.,Guo, Anke.,Guo, Qingjun.,Rui, Maoling.,Zhao, Yongfu.,...&Zhu, Shengnan.(2017).Decomposition of dexamethasone by gamma irradiation: Kinetics, degradation mechanisms and impact on algae growth.CHEMICAL ENGINEERING JOURNAL,307,722-728.
MLA Guo, Zhaobing,et al."Decomposition of dexamethasone by gamma irradiation: Kinetics, degradation mechanisms and impact on algae growth".CHEMICAL ENGINEERING JOURNAL 307(2017):722-728.
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