γ辐照降解水中磺胺嘧啶的研究

γ-radiation induced sulfadiazine removal in aqueous solution

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.

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.