DCMC/PEI涂层改性PVDF超滤膜的分离和抗污染性能研究  

Research on the separation and antifouling performance of DCMC/PEI coated modified PVDF ultrafiltration membrane

作　　者：王茜蕙 刘俊良 张干伟 黄逸轩 WANG Qianhui;LIU Junliang;ZHANG Ganwei;HUANG Yicuan(Jiangsu Province Engineering Research Center for Separation and Purification Materials and Technology,School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]江苏省分离净化材料与技术工程研究中心,苏州科技大学环境科学与工程学院,苏州215009

出　　处：《膜科学与技术》2024年第5期57-66,共10页Membrane Science and Technology

基　　金：国家自然科学基金项目(51978433);苏州市科技发展计划项目(SGC2021120)。

摘　　要：为了减轻膜污染和提高膜的分离性能,采用一步沉积法将双醛羧甲基纤维素(DCMC)和聚乙烯亚胺(PEI)涂覆在聚偏氟乙烯(PVDF)超滤膜的表面.DCMC上的醛基可以和PEI上的氨基在膜表面发生席夫碱反应,形成化学交联.与纯PVDF膜相比,DCMC/PEI涂层改性膜具有更高的亲水性(水接触角<40°)和收缩的孔径(平均孔径≈20.32 nm).以腐殖酸(HA)、牛血清白蛋白(BSA)和海藻酸钠(SA)为代表,研究DCMC/PEI涂层改性膜的分离和抗污染性能.涂层膜对HA、BSA和SA具有超过93%的截留率和通量恢复率(FRR),相比原PVDF膜提升了38%.这种兼具高分离和抗污染性能的纤维素涂层膜,为废水净化提供了新的思路.In order to reduce membrane contamination and improve membrane separation performance,a one-step deposition method was used to coat bis-formaldehyde carboxymethyl cellulose(DCMC)and polyethyleneimine(PEI)on the surface of polyvinylidene fluoride(PVDF)ultrafiltration membranes.Schiff base reactions occurred between the aldehyde groups on DCMC and the amino groups on PEI,forming a stable chemical crosslinking on the membrane surface.Compared to the pristine PVDF membrane,the DCMC/PEI-coated membrane exhibited enhanced hydrophilicity(water contact angle<40°)and a reduced pore size(average pore size≈20.32 nm).Humic acid(HA),bovine serum albumin(BSA),and sodium alginate(SA)were used as model pollutants from surface water for NOM rejection and antifouling experiments.The coated membrane provides over 93%rejection and flux recovery(FRR)of HA,BSA and SA,a 38%improvement over the original PVDF membrane.This cellulose-based coated membrane,which possesses both high separation and antifouling properties,offers a novel approach to mitigating membrane fouling.

关 键 词：PVDF超滤膜 涂层 双醛羧甲基纤维素 聚乙烯亚胺 天然有机物 抗污染 

分 类 号：TQ028.8[化学工程]