聚多巴胺涂覆LDH/PVDF改性膜的制备及性能测试  

Preparation and Properties of Dopamine and LDH-modified PVDF Ultrafiltration Membranes

作　　者：张怡萱 房平[1] 宋经华[1] 杜明山 范恩然 ZHANG Yixuan;FANG Ping;SONG Jinghua;DU Mingshan;FAN Enran(School of Urban Planning and Municipal Engineering,Xi’an Polytechnic University,Xi’an Shaanxi 710048,China)

机构地区：[1]西安工程大学规划与市政工程学院,陕西西安710048

出　　处：《当代化工》2024年第8期1922-1926,共5页Contemporary Chemical Industry

基　　金：西安市科技计划项目(项目编号:23GXFW0023)。

摘　　要：聚偏氟乙烯(PVDF)具有特殊的疏水性,在分离废水的过程中,污染物覆盖膜表面并堵塞膜孔会导致膜的渗透性能下降。使用浸没沉淀相转化法,通过调整水滑石(LDH)添加剂的配比和改性膜浸泡在含有盐酸多巴胺缓冲溶液中的时间,制备了LDH/PVDF改性膜及聚多巴胺(PDA)涂覆LDH/PVDF改性膜。测试了改性膜孔隙率、平均孔径、水通量、截留率、接触角、抗污染性等性能的变化。结果表明:当LDH添加量为3%时,孔隙率最大,比纯膜提升15.35%,平均孔径增加8.48 nm;膜通量最大为943.22 L·m^(-2)·h^(-1),比纯膜增加了382.95 L·m^(-2)·h^(-1),膜孔中污染物沉积减少,可逆污染占比升高,抗污染能力最强,清洗后通量恢复率为81.5%,相比纯膜M0提升了34.2%。PVDF has special hydrophobicity,and in the process of separating wastewater,contaminants covering the membrane surface and clogging the membrane pores will lead to a decrease in the permeation performance of the membrane.LDH/PVDF-modified membranes and polydopamine(PDA)-coated LDH/PVDF-modified membranes were prepared by adjusting the ratio of the hydrotalcite(LDH)additive and the time of the modified membranes immersed in a buffer solution containing dopamine hydrochloride using the submerged precipitation phase transition method.The changes in the properties of the modified membranes,such as porosity,average pore size,water flux,retention rate,contact angle,and contamination resistance,were tested.The experimental results showed that when LDH was added at 3%,the porosity was maximally increased by 15.35%compared with the pure membrane,and the average pore diameter was increased by 8.48 nm.The membrane flux was maximally 943.22 L·m^(-2)·h^(-1),which was increased by 382.95 L·m^(-2)·h^(-1) compared with the pure membrane,and the pollutant deposition in the membrane pores was reduced,the percentage of reversible pollution was elevated,and the pollution resistance was the strongest,and the flux recovery rate after cleaning was 81.5%,which was improved by 34.2%compared with pure membrane M0.

关 键 词：多巴胺 水滑石 PVDF超滤膜 共混改性 抗污染性能 

分 类 号：TQ051.893[化学工程]