• 关键词：γ辐照  磺胺嘧啶  降解  Gaussian软件  LC-MS

• 基金项目：江苏省科研项目(No.BK2009414);江苏省"青蓝工程"人才项目;江苏省环保科研课题(No.201017);南京信息工程大学科研项目(No.20080316); 江苏省"六大人才高峰"资助项目

• 郭照冰
• 南京信息工程大学环境科学与工程学院,南京 210044

• 周飞
• 南京信息工程大学环境科学与工程学院,南京 210044

• 赵永富
• 江苏省农业科学院原子能农业利用研究所,南京 210014

• 张超智
• 南京信息工程大学环境科学与工程学院,南京 210044

• 包春晓
• 南京信息工程大学环境科学与工程学院,南京 210044

• 秦开桂
• 南京信息工程大学环境科学与工程学院,南京 210044

• 林明月
• 南京信息工程大学环境科学与工程学院,南京 210044

• 摘要：实验研究了水中磺胺嘧啶(SD)的γ辐照降解,考察了SD初始浓度、溶液pH值,以及联合H₂O₂、Fenton试剂对其辐照降解的影响.结果表明:γ辐照可有效降解水中SD,低浓度SD在酸性条件下的辐照降解更为显著,降解过程遵循准一级反应动力学模型.添加H₂O₂可在一定程度上促进SD的γ辐照降解,加入Fenton试剂则显著提升SD的去除率.根据量化计算和LC-MS结果,探讨了SD的γ辐照降解机理.γ辐照降解水中SD主要是基于· OH自由基的氧化过程.

• Abstract：Sulfadiazine (SD) was degraded by γ-radiation in an aqueous solution. The effects of initial concentrations of SD, pH values of solution, H₂O₂ and Fenton reagent on degradation of SD were investigated. Experimental results showed that SD can be effectively degraded by γ-irradiation in an aqueous solution. The degradation efficiencies of low-concentration SD can be remarkably improved in an acid solution. The degradation of SD was in accordance with the pseudo-first-order kinetic model. In addition, H₂O₂ can fairly promote degradation of SD induced by γ-radiation. Fenton reagent can markedly promote degradation of SD induced by γ-radiation. The degradation mechanism of SD was supposed by results of quantum chemical calculations and LC-MS. Degradation of SD induced by γ-radiation was mainly ascribed to OH oxidation.

• Key words：γ-radiation  sulfadiazine  degradation  Gaussian software  LC-MS

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