溶剂冲洗对界面聚合制备中空纤维聚酰胺纳滤膜的影响

Effect of solvent rinse on preparation of hollow fiber polyamide nanofiltration membrane by interfacial polymerization

以自制的聚砜(PSf)中空纤维超滤膜为基膜,以哌嗪为水相单体,均苯三甲酰氯为有机相单体,在PSf基膜内表面进行界面聚合反应,制备内压式中空纤维聚酰胺纳滤膜.重点研究了溶剂冲洗过程对界面聚合制备中空纤维聚酰胺纳滤膜的影响.此外,考察了哌嗪浓度、均苯三甲酰氯浓度、反应时间等条件对中空纤维纳滤膜脱盐性能的影响,表征了膜表面形貌和化学性质.在最佳条件下制备的内压式中空纤维纳滤膜的纯水渗透通量为124 L/(m^(2)·h·MPa),截留分子量约为360,对不同无机盐的截留顺序为:Na_(2)SO_(4)(97.71%)>MgSO_(4)(95.08%)>CaCl_(2)(54.44%)>NaCl(16.18%).

The home-made polysulfone(PSf)hollow fiber ultrafiltration membrane was used as substrate to prepare internal pressure hollow fiber nanofiltration membrane through interfacial polymerization reaction.Piperazine was used as the aqueous phase monomer,while trimesoyl chloride was used as the organic phase monomer.The solvent rinse speed was investigated to optimize the nanofiltration performance.Moreover,the preparation conditions such as piperazine concentration,trimesoyl chloride concentration and reaction time were also studied.The surface morphology and chemical structure of the hollow fiber membrane were characterized by SEM and FTIR.Under the optimum conditions,the pure water permeance of the internal pressure hollow fiber nanofiltration membrane was 124 L/(m^(2)·h·MPa),Moleaular weight cutoff was about 360.The order of rejection for different inorganic salts was Na_(2)SO_(4)(97.71%)>MgSO_(4)(95.08%)>CaCl_(2)(54.44%)>NaCl(16.18%).