Gamma irradiation-induced sulfadiazine degradation and its removal mechanisms

被引：130
作者：
Guo, Zhaobing [1 ,2 ]
Zhou, Fei [1 ,2 ]
Zhao, Yongfu [3 ]
Zhang, Chaozhi [1 ,2 ]
Liu, Fengling [1 ,2 ]
Bao, Chunxiao [1 ,2 ]
Lin, Mingyue [1 ,2 ]
机构：
[1] Nanjing Univ Informat Sci & Technol, Sch Environm Sci & Engn, Nanjing 210044, Peoples R China
[2] Jiangsu Key Lab Atmospher Environm Monitoring & P, Nanjing 210044, Peoples R China
[3] Jiangsu Acad Agr Sci, Inst Applicat Atom Energy Agr, Nanjing 210014, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2012年 / 191卷
关键词：
Gamma irradiation; Sulfadiazine; Gaussian; LC-MS; RADIATION; WATER; SULFONAMIDES; WASTEWATERS;
D O I：
10.1016/j.cej.2012.03.012
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Gamma irradiation-induced removal of sulfadiazine (SD) under different conditions was investigated. The results show that SD can be effectively degraded using gamma irradiation. The removal efficiencies of low-concentration SD can be remarkably improved in an acid solution, and SD degradation was in accordant with the pseudo-first-order kinetic model. The additives, such as H2O2 and Fenton reagent. were favorable for removing SD during gamma irradiation. However. SD removal was restrained with the addition of Na2CO3. Adding CH3OH in solution, we found that SD removal was restrained at low-irradiation dose while markedly promoted at high-irradiation dose. Based on the results of quantum chemical calculations and LC-MS analysis, SD degradation using gamma irradiation in aqueous solution is mainly ascribed to (OH)-O-center dot oxidation and the direct decomposition of SD molecules. (c) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：256 / 262
页数：7
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