摘要
为探究亚铁离子(Fe^(2+))/过氧单硫酸盐(PMS)/超滤(UF)组合工艺对水中全氟辛酸(PFOA)的降解作用,试验通过设置不同条件、定性活性自由基和中间产物来分析组合工艺降解PFOA作用机理。结果表明,体系降解PFOA最佳条件为p H值=3,n(PFOA)∶n(PMS)=1∶200,在此基础上,紫外协同强化方式表现出最佳效果。而当强化体系中腐殖质(HA)共存时,pH值=7的反应条件更优,此时主要以混凝沉淀为主,氧化为辅。EPR结果表明UV/Fe^(2+)/PMS反应体系中同时存在·OH和SO_(4)^(-)·2种活性自由基,SO_(4)^(-)·为主要作用自由基,并通过LC-MS分析得出理想状况下PFOA最终将被矿化为CO_(2)和F^(-)。
This study was conducted to investigate the degradation of perfluorooctanoic acid(PFOA)by ferrous(Fe^(2+))/peroxonosulfate(PMS)/ultrafiltration(UF)combined process.The mechanism of degradation of PFOA by the combined process was analyzed by setting the influencing factors,qualitative active free radicals and intermediates.The results showed that the optimal conditions for degradation of PFOA in the system were pH=3,n(PFOA):n(PMS)=1:200.On this basis,UV synergistic enhancement method showed the best effect.However,when humus existed in the enhanced system,the reaction condition was better at pH=7,which was mainly coagulated precipitation and supplemented by oxidation.The EPR results showed that there were two active free radicals·OH and SO_(4)^(-)in the UV/Fe^(2+)/PMS reaction system,and SO_(4)^(-),was the main active free radical.The LC-MS analysis showed that PFOA would eventually be mineralized into CO_(2)and F^(-)under ideal conditions.
作者
陶辉
于多
顾颖
林涛
TAO Hui;YU Duo;GU Ying;LIN Tao(College of Environment,Hohai University,Nanjing 210098,China;Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Hohai University,Nanjing 210098,China)
出处
《环境科技》
2023年第2期24-30,共7页
Environmental Science and Technology
基金
国家自然科学基金项目(52070068)
苏州市科技发展计划项目(SS201846)。
关键词
亚铁离子
过氧单硫酸盐
超滤
全氟辛酸
紫外协同
Ferrousion
Peroxymonosulfate
Ultrafiltration
Perfluorooctanoic acid
Ultraviolet coordination
