CP/PVDF膜电活化PS降解新污染物及缓解膜污染  

Degradation emerging contaminants and mitigation membrane fouling by electrochemical activation of persulfate

作　　者：刘寅 许岐斌 宋子恒 刘索 赵纯[1] LIU Yin;XU Qi-bin;SONG Zi-heng;LIU Suo;ZHAO Chun(Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment,Ministry of Education,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学,三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《中国环境科学》2023年第11期5757-5764,共8页China Environmental Science

基　　金：国家自然科学基金资助项目(22076015);重庆市自然科学基金(cstc2019jcyj-msxmX0463);重庆市医学科研项目(2021MSXM083)。

摘　　要：通过耦合高级氧化技术实现超滤过程中对膜污染的缓解以及小分子溶解性有机污染物(SMOP)的去除.通过喷涂的方式将交联聚吡咯的碳纳米管沉积在聚偏氟乙烯(PVDF)膜表面,得到了具有优异导电性的交联聚吡咯的碳纳米管复合超滤膜(CP/PVDF).实验中建立了膜阴极过滤过硫酸盐体系(E-PS-CP/PVDF).并比较了过一硫酸盐(PMS)和过二硫酸盐(PDS)分别作为氧化剂时该体系对膜污染的缓解(HA作为模拟污染物)以及小分子有机物的去除效果.结果表明,E-PS-CP/PVDF体系对3种小分子有机污染物(SMOP)卡马西平(CBZ)、双氯芬酸钠(DCF)和磺胺甲噁唑(SMX)均有较高的去除速率,其一级动力学常数均高于15×10^(-2)min^(-1)远高于单独超滤体系(最高为0.072×10^(-2)min^(-1)).E-PS-CP/PVDF体系具有明显的膜污染缓解作用,使用PMS和PDS作为电解质时,60min内出水比通量仅仅分别下降到0.93和0.84,外加电场与活性物质对HA的氧化作用改变了污染物在膜表面的相互作用,减少了HA在膜上的沉积.此外,通过捕获实验探究了E-PS-CP/PVDF体系缓解膜污染的机理.,E-PS-CP/PVDF体系中缓解膜污染的主要原因是由于体系中的PS被膜阴极活化产生了•OH、SO_(4)^(•)-和1O_(2),且PMS作为氧化剂具有更好的表现.因此,E-PS-CP/PVDF体系能够实现超滤过程中膜污染的缓解和对小分子有机物的去除,在实际水处理领域具有良好的应用前景.The occurrence of membrane fouling and the poor retention effect of small molecular organic pollutants have been important factors limiting the development of ultrafiltration technology.This study realized the mitigation of membrane fouling and the removal of small molecular organic pollutants(SMOP)in the ultrafiltration process by coupling advanced oxidation technology.Cross-linked polypyrrole carbon nanotubes were deposited on the surface of polyvinylidene fluoride(PVDF)membrane by spraying,and the crosslinked polypyrrole carbon nanotubes composite ultrafiltration membrane(CP/PVDF)with excellent conductivity was obtained.The performance of fouling mitigation(HA as the simulated pollutant)and removing small molecular organic pollutants was compared when peroxymonosulfate(PMS)and peroxodisulfate(PDS)were used as oxidants respectively.The results showed that the E-PS-CP/PVDF system had high removal ratios for three different small molecular organic pollutants,carbamazepine(CBZ),diclofenac sodium(DCF)and sulfamethoxazole(SMX),and its first-order kinetic constants were higher than 15×10^(-2)min^(-1),much higher than that of the ultrafiltration system alone(the highest was 0.072×10^(-2)min^(-1)).E-PS-CP/PVDF system had obvious membrane pollution mitigation effect.When using PMS and PDS as electrolytes,the normalized membrane flux only decreased to 0.93and 0.84 within 60min,respectively.The applied electric field and the oxidation of oxidizing hydroxyl radicals on HA changed the interaction of pollutants on the membrane surface and reduced the deposition of HA on the membranes.In addition,the fouling mitigation mechanism of E-PS-CP/PVDF system to alleviate membrane fouling was explored through quenching experiments.The results of mechanism experiments showed that the main reason for alleviating membrane fouling in E-PS-CP/PVDF system was the•OH,SO_(4)•-and 1O_(2) generated by the cathodic activation of PS,and PMS had better performance as oxidant than PDS.Therefore,E-PS-CP/PVDF system can alleviate membrane poll

关 键 词：PVDF CP/PVDF膜 过硫酸盐 电活化 腐殖酸 

分 类 号：X703.1[环境科学与工程—环境工程]