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以聚砜超滤膜为基膜,采用界面聚合方法制备了聚哌嗪酰胺复合纳滤膜,并对其膜性能进行了表征。实验重点考察了基膜性质、聚合单体浓度、聚合反应时间、表面活性剂浓度、酸受体添加量等因素对纳滤膜性能的影响,确定了纳滤膜制备过程的界面聚合优化条件,即:水相单体(哌嗪)浓度0.080.12molL-1;有机相单体(间苯二甲酰氯和均苯三甲酰氯混合物)浓度0.080.1molL-1;聚合反应时间3~5min。在0.4MPa、25℃条件下,实验测得复合纳滤膜的水通量为4.12Lm-2h-1bar-1,膜对浓度为0.01molL-1的NaCl的截留率为30%~40%,对浓度为0.005molL-1的Na2SO4的截留率为80%~90%;对分子量不低于300gmol-1的有机物的截留率高于95%。该膜的分离性能接近于商业纳滤膜,其分离机理主要表现为“筛分机理以及膜与电解质之间的荷电作用。
Abstract：A polypiperazine-amide composite nanofiltration membrane was fabricated by interfacial polymerization (IP) of piperazine and the mixture of isophthaloyl (IPC) and trimesoyl chloride(TMC) onto the polysulfone (PS) support membrane. The effeet of the characteristics of PS membrane, the concentrations of monomers, surfactant (SDS) and alkaline, and the reaction time of IP on the character of the composite nanofiltration membrane were carefully studied for preparing the best NF membrane. The feasible concentration of IPC and TMC mixture for IP is approximately 0.080.1mol-1, the concentration of piperazine is 0.080.12molL-1 and the reaction time of IP is 3~5min. The composite nanofiltration membranes were characterized through flux/retention tests of different inorganic salts and organic dyes at 0.4 MPa and 25℃. The experimental results show that the retention of the composite nanofiltration membrane to NaCl (0.01molL-1) is about 30%~40%, to Na2SO4 (0.005molL-1), nearly 80%~90%, and to organics of molecular weight greater than 300g穖oL-1, more than 95%. These separation performances are similar to those of the commercial nanofiltration membranes. The experimental results indicate that the composite nanofiltration membrane bears the slightly negative charges, and that the steric (sieving) and Donnan effects are main mechanisms of the electrolyte permeation across the membranes.
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基本信息:
中图分类号:TQ320.721
引用信息:
[1]高爱环,刘金盾,张浩勤,刘海霞,方文骥.聚哌嗪酰胺复合纳滤膜制备及其性能表征[J],2004(01):28-32.
基金信息:
河南省高校杰出科研人才创新工程资助项目(2001KYCX006)。