摘要
为了调控聚偏氟乙烯(PVDF)膜的孔状结构和性能,以乙烯丙烯酸(EAA)为添加剂、PEG400为致孔剂,通过浸入沉淀相转换法制备了PVDF/EAA复合膜。采用SEM、FTIR表征了其结构和成分;对复合膜的渗透性能和抗污染性能进行了测试,考察了不同EAA、PEG400质量分数对复合膜结构和性能的影响。结果表明,与未加EAA的PVDF膜(E-0)相比,PVDF/EAA复合膜表现出更高的渗透性能、分离性能和抗污染性能。EAA可以改善复合膜表面的亲水性,PEG400可以提高铸膜液和凝固浴之间的亲和性,加快成膜速率,从而在膜表面形成更多的孔洞。当EAA质量分数为3%,PEG400的质量分数为4%时,PVDF/EAA复合膜(E-3)的纯水渗透通量和牛血清白蛋白截留率分别为271.57L/(m^(2)·h)和64.83%,比E-0分别提高了486.42%和116.10%;通量恢复率和总污染率分别为75.97%和46.51%,比E-0分别提升了19.37%和降低了26.92%。当EAA的质量分数为3%,PEG400的质量分数为3%时,PVDF/EAA复合膜(P-3)的孔隙率为53.33%,平均孔径为4.55 nm,比未加PEG400的PVDF/EAA复合膜(P-0)的孔隙率和平均孔径分别提高了33.33%和88.02%。
To modulate the pore structure and performance of polyvinylidene fluoride(PVDF) membrane,a series of PVDF/ethylene acrylic acid(EAA) composite membranes were prepared by immersion precipitation phase conversion method using EAA as additive and PEG400 as porogenic agent,and then characterized by SEM and FTIR.The permeability and anti-fouling performance of the composite membranes were analyzed,while the effects of EAA and PEG400 mass fractions on the structure and properties of the composite membranes were investigated.The results showed compared with the PVDF membrane(E-0) without EAA,PVDF/EAA composite membranes exhibited higher permeability,separation performance and pollution resistance.EAA improved the surface hydrophilicity of the composite membrane,while PEG400 enhaced the affinity between the casting liquid and the solidification bath,accelerated the membrane formation rat thus leading to more pores formed on the membrane surface.PVDF/EAA composite membrane(E-3),prepared with 3% EAA and 4% PEG400(both are mass fraction,the same below),exhibited a pure water permeability of 271.57 L/(m^(2)·h) and bovine serum albumin retention of 64.83%,which were 486.42% and 116.10% higher than that of E-0,respectively,a flux recovery rate of 75.97% and total contamination rate of 46.51%,which were 19.37% higher and 26.92% lower than E-0.PVDF/EAA composite membrane(P-3) with 3% EAA and 3% PEG400 showed a porosity of 53.33% and an average pore size of 4.55 nm,which were 33.33% and 88.02% higher than that of PVDF/EAA composite membrane(P-0) without PEG400,respectively.
作者
薛禹
谭妍妍
张道海
罗筑
秦舒浩
武晓
XUE Yu;TAN Yanyan;ZHANG Daohai;LUO Zhu;QIN Shuhao;WU Xiao(School of Chemical Engineering,Guizhou Minzu University,Guiyang 550025,Guizhou,China;Guizhou Institute of Materials Industry Technology,National Engineering Research Center for Composite Modified Polymer Materials,Guiyang 550014,Guizhou,China;College of Materials and Metallurgy,Guizhou University,Guiyang 550025,Guizhou,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2024年第7期1606-1614,共9页
Fine Chemicals
基金
国家自然科学基金项目(52163001)
贵州省省级科技计划项目(黔科合平台人才-CXTD[2021]005、黔科合平台人才-GCC[2022]010-1、黔科合支撑[2023]一般347、黔科合平台人才-GCC[2022]043)
贵阳市专家工作站资助项目(ZJGZZ2021-07)
贵州民族大学科研平台资助项目(GZMUGCZX[2021]01)
贵阳市观山湖区科技计划项目(观科合同[2022]2号)。
关键词
聚偏氟乙烯
聚乙烯丙烯酸
致孔剂
渗透性能
抗污染性能
水处理技术
polyvinylidene fluoride
polyethylene acrylic acid
porogenic agents
permeation properties
anti-fouling properties
water treatment technology
