聚偏氟乙烯(PVDF)作为常用的膜分离材料,因其具有优异的性能,被广泛应用于水处理和环境工程领域。但PVDF超滤膜材料疏水性较强,污染物易附着在膜表面或堵塞膜孔,造成膜污染。基于此,使用非溶剂致相分离法(NIPS),将壳聚糖改性硅藻土(CS-DT)共混PVDF制备改性膜。结果表明:与原始膜相比,改性膜接触角降低了32.74%,孔隙率提高了20.38%,水通量高了46.91%,表现出优良的亲水性。此外,改性膜在牛血清蛋白(BSA)的抗污染测试中通量恢复率可达77.5%,通量衰减率降低至42.9%,其中可逆污染率为26.7%,展现出优异的抗污染性能。
Polyvinylidene fluoride (PVDF),as a commonly used membrane separation material,is widely applied in the field of water treatment and environmental engineering due to its excellent performance.However,PVDF membrane material is highly hydrophobic,and pollutants are easy to adhere to the membrane surface or block the membrane pores,resulting in membrane contamination.Based on this,in this paper,modified membranes were prepared by blending chitosan-modified diatomaceous earth (CS-DT) with PVDF using non-solvent-initiated phase separation (NIPS).The results indicated that compared with the pristine membrane,the modified membrane showed excellent hydrophilicity with 32.74% lower contact angle,20.38% higher porosity,and 46.91% higher water flux.In addition,the flux recovery rate of the modified membrane in the anti-pollution test of BSA could be up to 77.5%,and the flux attenuation rate was reduced to 42.9%,of which the reversible pollution rate was 26.7%,demonstrating excellent anti-contamination performance.
[1] Cheng K,Zhang N,Yang N,et al.Rapid and robust modification of PVDF ultrafiltration membranes with enhanced permselectivity,antifouling and antibacterial performance[J].Separation and Purification Technology,2021,262:118316.
[2] Zuo C,Wang L,Tong Y,et al.Co-deposition of pyrogallol/polyethyleneimine on polymer membranes for highly efficient treatment of oil-in-water emulsion[J].Separation and Purification Technology,2021,267:118660.
[3] Zou D,Lee Y M.Design strategy of poly(vinylidene fluoride) membranes for water treatment[J].Progress in Polymer Science,2022,128:101535.
[4] Kang G D,Cao Y M.Application and modification of poly(vinylidene fluoride)(PVDF) membranes-a review[J].Journal of Membrane Science,2014,463:145-165.
[5] Subasi Y,Cicek B.Recent advances in hydrophilic modification of PVDF ultrafiltration membranes-a review:part Ⅰ[J].Membrane Technology,2017,2017:7-12.
[6] Subasi Y,Cicek B.Recent advances in hydrophilic modification of PVDF ultrafiltration membranes-a review:part Ⅱ[J].Membrane Technology,2017,2017:5-11.
[7] Saxena P,Shukla P.A comprehensive review on fundamental properties and applications of poly(vinylidene fluoride)(PVDF)[J].Advanced Composites and Hybrid Materials,2021,4:8-26.
[8] Liu C,Wang W,Li Y,et al.PMWCNT/PVDF ultrafiltration membranes with enhanced antifouling properties intensified by electric field for efficient blood purification[J].Journal of Membrane Science,2019,576:48-58.
[9] Wu Q,Tiraferri A,Wu H,et al.Improving the performance of PVDF/PVDF-g-PEGMA ultrafiltration membranes by partial solvent substitution with green solvent dimethyl sulfoxide during fabrication[J].ACS Omega,2019,4(2):19799-19807.
[10] Liu Y,Wei Y,Su J,et al.Surface-modified PVA/PVDF hollow fiber composite membrane for air dehumidification[J].Journal of Materials Science,2020,55:5415-5430.
[11] Tang S H,Venault A,Hsieh C,et al.Abio-inert and thermostable zwitterionic copolymer for the surface modification of PVDF membranes[J].Journal of Membrane Science,2020,598:117655.
[12] Saini B,Vaghani D,Khuntia S,et al.A novel stimuli-responsive and fouling resistant PVDF ultrafiltration membrane prepared by using amphiphilic copolymer of poly (vinylidene fluoride) and poly(2-N-morpholino) ethyl methacrylate[J].Journal of Membrane Science,2020,603:118047.
[13] Van Tran T T,Kumar S R,Nguyen C H,et al.High-permeability graphene oxide and poly (vinyl pyrrolidone) blended poly (vinylidene fluoride) membranes:roles of additives and their cumulative effects[J].Journal of Membrane Science,2021,619:118773.
[14] Chen G,Xie W,Chen C,et al.Preparation of high flux chlorinated polyvinyl chloride composite ultrafiltration membranes with ternary amphiphilic copolymers as anchor pore-forming agents and enhanced anti-fouling behavior[J].Industrial & Engineering Chemistry Research,2023,62(3):1390-1403.
[15] 蒋遇龙,周美珍,陈杰.PVC/PVDF/硅藻土复合超疏水材料的制备及其性能研究[J].宁德师范学院学报(自然科学版),2021,33(2):147-152.
[16] 姜德彬.硅藻土基复合材料的可控制备与有机废水处理研究[D].重庆:重庆大学,2019.
[17] 高俊英,曹泽允,贾太轩.盐酸改性硅藻土的研究[J].广东化工,2014,41(8):59-60.
[18] 陈淑怡,张晨,张琪,等.基于混合胺的PVDF复合疏松纳滤膜及其在染料废水处理中的应用[J].广东化工,2024,51(20):20-23.
[19] 宋文利,郝前程,曹苍久,等.单宁酸改性功能膜的制备及染料吸附性能研究[J].材料导报,2024,38(S2):518-522.
[20] 唐峰玲,杨景,张子旭,等.CMC/PPy/PVDF复合膜的制备及其染料/盐分离性能[J].膜科学与技术,2024,44(5):117-124.
[21] 杨凌茜,李璐,蒋奇锦.基于聚丙烯熔喷非织造材料的复合薄膜制备与液体分离性能[J].塑料科技,2023,51(6):19-23.
[22] 郭天宇,朱奕锟,艾孜哈尔·艾尼,等.碳化硅藻土吸附处理盐酸四环素的性能研究[J].广东化工,2024,51(17):36-39.
基金资助
陕西省重点研发计划项目(2024SF-YBXM-573);西安市科技计划项目(23GXFW0023)
PDF
