基于羟丙基-β-环糊精的界面聚合纳滤膜及其性能研究

The interface polymerized nanofiltration membrane with hydroxypropyl-β-cyclodextrin as aqueous monomer

以羟丙基-β-环糊精(HP-β-CD)为水相单体,γ-氨丙基三乙氧基硅烷(KH-550)为添加剂,与均苯三甲酰氯(TMC)在聚砜(PSf)基膜上界面聚合,制备HP-β-CD-TMC/PSf复合纳滤膜.通过FTIR、SEM、AFM和Zeta电位等表征了膜表面的化学组分、形貌及荷电性,探究了不同KH-550含量对PSf复合膜分离性能的影响,并考察了复合膜的耐氯性能.结果表明,水相中KH-550质量分数为0.15%时,制备的复合纳滤膜亲水性较好,对伊文思蓝(EB)、刚果红(CR)、木质素磺酸钠(SL)的截留率均在90%以上,通量大于54.5 L/(m^(2)·h·MPa).复合膜经10.0 g/L的次氯酸钠(NaClO)浸泡200 h后,其通量和截留率无明显变化,表明该复合膜具有较好的耐氯稳定性.

The composite nanofiltration membrane with good chlorine resistance was prepared by interfacial polymerization on polysulfone(PSf)substrate membrane using hydroxypropyl-β-cyclodextrin(HP-β-CD)as aqueous phase,γ-aminopropyltriethoxysilane(KH-550)as additive and triformyl chloride(TMC)as organic phase.The surface chemical composition,morphology,structure and charges of the membranes were characterized by FTIR,SEM,AFM and Zeta potential.The effect of KH-550 concentration on the separation performance as well as the chlorine tolerance of membranes was explored.The results showed that the optimal HP-β-CD-TMC/PSf membrane exhibited water contact angle of 69°with water permeabity of 70.7 L/(m^(2)·h·MPa),when the concentration of KH-550 is 0.15%,and the rejection rate of evans blue(EB),congo red(CR)and sodium lignosulfonate(SL)is more than 90%along with flux more than 54.5 L/(m^(2)·h·MPa).In addition,the membrane displayed an excellent chlorinea resistance after soaking in 10.0 g/L NaClO for 200 hours.