Gamma irradiation-induced sulfadiazine degradation and its removal mechanisms
Gamma irradiation-induced sulfadiazine degradation and its removal mechanisms
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DOI：
10.1016/j.cej.2012.03.012
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发表时间：
2012-05-15
影响因子：
15.1
通讯作者：
Lin, Mingyue
中科院分区：
文献类型：
--
作者：
Guo, Zhaobing;Zhou, Fei;Lin, Mingyue
研究了不同条件下γ辐照对磺胺嘧啶（SD）的去除效果。结果表明，γ辐照可以有效地降解SD。在酸性溶液中可以显著提高低浓度SD的去除效率，SD的降解符合准一级动力学模型。添加剂，如H2O2和Fenton试剂。有利于去除γ辐照下的SD。然而。Na2CO3的加入抑制了SD的去除。在溶液中加入CH3OH，我们发现在低辐照剂量下抑制SD的去除，而在高辐照剂量下明显促进SD的去除。基于量子化学计算和LC-MS分析结果，水溶液中γ辐照降解SD的主要原因是(OH)- o中心点氧化和SD分子的直接分解。(c) 2012 Elsevier B.V.版权所有
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.