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基于硫酸根自由基的高级氧化对头孢氨苄的降解特性
Performance of Cefalexin Degradation by Sulfate Radical Based Advanced Oxidation Process
投稿时间:2018-08-02  修订日期:2018-10-29
DOI:
中文关键词:  头孢氨苄  过硫酸盐  动力学  降解特性
英文关键词:cefalexin  persulfate  kinetics  degradation
基金项目:国家自然科学基金青年基金,高盐基质中β-内酰胺抗生素的自由基降解机制及模型研究;国家自然科学基金,铁基污泥水热炭强化印染废水生物脱氮除碳的效能与机制
作者单位E-mail
李珂 东华大学 1437206360@qq.com 
刘振鸿 东华大学 zhhl@dhu.edu.cn 
钱雅洁 东华大学环境科学与工程学院 yqian@dhu.edu.cn 
薛罡 东华大学环境科学与工程学院  
王麒 东华大学环境科学与工程学院  
李前 东华大学环境科学与工程学院  
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中文摘要:
      我国是世界上抗生素使用量最大的国家,近年来头孢类抗生素在地表水和污水中频繁被检出。环境中低浓度的抗生素暴露会诱导产生抗生素耐药菌及抗性基因等,严重威胁生态及公众健康。高级氧化(Advanced Oxidation Processes, AOPs)是去除水体中微污染物的重要技术,选取头孢类抗生素中的典型物质头孢氨苄(CFX)为研究对象,探讨了其在UV/过硫酸盐(UV/PS)体系中的降解特性。结果表明,pH=7.0时,UV/PS体系中SO4-·和·OH均对CFX有降解作用,且其与CFX反应的二阶速率常数分别为 , 。 PS投加量的增加可加速CFX的降解和矿化,且酸性条件可促进CFX降解。水体基质Cl-的存在对CFX的降解起到了低浓度抑制高浓度促进的作用,HCO3-和自然有机质(NOM)的存在对CFX的降解稍有抑制。最后,在实际水样中的应用研究表明UV/PS体系可以有效降解和矿化实际地表水样(SW)和实际废水样(WW)中的CFX,具有较好的应用前景。
英文摘要:
      China is the country with the largest amount of antibiotics in the world. Recently, cephalosporin antibiotics have been frequently detected in surface water (SW) and wastewater (WW). Antibiotics in the environment have been regarded as a major threat to ecosystem and public health due to their potential of inducing drug-resistant bacterial and antibiotic resistance genes. Advanced Oxidation Processes (AOPs) are effective techniques for removing micropollutants. In this study, cefalexin (CFX), a typical cephalosporin antibiotic, was selected as the objective contaminant. And the performance of CFX degradation by UV/persulfate (UV/PS) was investigated. Results showed that both SO4-·and ·OH contributed to CFX degradation at pH 7.0 and CFX reacted with SO4-· and ·OH at the second-order rate constants of , , respectively. The increase of PS dosage could enhance the degradation and mineralization rates of CFX. The promotion of CFX degradation was also observed under acidic condition. The effects of water matrices on CFX degradation were also investigated here. In the presence of low Cl- concentration, CFX degradation was inhibited. Meanwhile, CFX degradation was promoted under high Cl- concentration. Both HCO3- and natural organic matter (NOM) inhibited the degradation of CFX slightly. Real water samples were applied and CFX could be degraded as well as mineralized effectively by UV/PS in SW and WW samples, implying UV/PS has great potential in the degradation and mineralization of CFX.
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