AEPPS对超支化聚酰胺纳滤膜性能的影响

Effect of N-aminoethyl piperazine propane sulfonate on the performances of hyperbranched polyamide nanofiltration membrane

通过与均苯三甲酰氯(TMC)的界面聚合反应,将N-氨乙基哌嗪丙基磺酸盐(AEPPS)两性离子化合物引入超支化聚酰胺纳滤膜中以改善膜性能。着重考察AEPPS的质量分数对膜性能的影响。结果表明,与以往报道该物质与哌嗪或间苯二胺等小分子混合使用效果不同,当AEPPS与端氨基超支化聚酰胺混合作为水相反应物时,随着AEPPS质量分数的增加,膜的脱盐顺序发生变化,由Na2SO4>Mg SO4>Mg Cl2>Na Cl逐渐变为Mg SO4>Mg Cl2≈Na2SO4>Na Cl,最后是Mg SO4>Na2SO4>Mg Cl2>Na Cl。脱盐率先增大后降低,膜通量呈现相反趋势。AEPPS的引入增强了膜的亲水性及抗蛋白质吸附能力。当水溶液中AEPPS质量分数为0.6%时,制备的纳滤膜NF06在牛血清蛋白或溶菌酶蛋白溶液中反复运行3次后,通量恢复率分别为99.3%和99.4%。

Zwitterionic diamine monomer N-aminoethyl piperazine propyl sulfonate(AEPPS)was incorporated into hyperbranched polyamide nanofiltration membranes by reacting with trimesoyl chloride(TMC)via interfacial polymerization to improve the performance of the membranes.The effect of AEPPS concentration on the performances of the membranes were systematically evaluated.Different from the results reported about AEPPS in conjunction with piperazine or m-phenylenediamine,when using AEPPS and hyperbranched polyamide mixture as aqueous reactants,the desalination order of the prepared membranes changed from Na2SO4>Mg SO4>Mg Cl2>Na Cl to Mg SO4>Mg Cl2≈Na2SO4>Na Cl and then to Mg SO4>Na2SO4>Mg Cl2>Na Cl by increasing AEPPS concentration.Salt rejection rate first increased and then decreased,while membrane flux showed the opposite trend.The hydrophilicity and anti-fouling properties of the membranes were enhanced by introducing AEPPS into the membranes.When the mass fractions of AEPPS was 0.6%,the prepared nanofiltration membrane NF06 showed excellent anti-fouling properties.After it being circulated in bovine serum protein or lysozyme protein solution for three times,the flux recovery rates were 99.3%and 99.4%respectively.