Abstract:

Based on the theory of interfacial polymerization， a series of nanofiltration（NF） or reverse osmosis （RO） composite membranes have been prepared. Aqueous solution piperazine or m-phenylenediamine is used as water phase， trimesoyl chloride/hexane as organic phase， and hollow fiber polysulfone ultrafiltration membrane as substrate. The effects of the concentrations of aqueous phase， and organic solution and interfacial polymerization time and temperature on the performance of hollow fiber composite membranes are investigated. The results show that when the pressure of hollow fiber composite nanofiltration membrane is 0.4 MPa at room temperature， the flux of 2 g/L of MgSO₄ aqueous solution can reach 36.64 L/（m²·h）， and the rejection rate is 97.2％. When the pressure of hollow fiber RO membrane is 0.7 MPa at room temperature， the flux of 0.5 g/L of sodium chloride aqueous solution can reach 12. 2 L/（m²·h），and its rejection rate is 96.5%.

Key words: hollow fiber, interfacial polymerization, reverse osmosis, nanofiltration, composite membrane

摘要：

根据界面聚合反应成膜原理,以哌嗪(PIP)或间苯二胺(m-PD)水溶液为水相,均苯三甲酰氯(TMC)正己烷溶液为有机相,以聚砜中空纤维超滤膜为基膜,制备了一系列聚酰胺/聚砜纳滤或反渗透复合膜。研究了水相浓度、有机相浓度、界面聚合时间和温度等条件对复合膜性能的影响。结果表明:中空纤维纳滤复合膜在0.4MPa、室温条件下,对2g/LMgSO₄水溶液的通量可达36.64L/(m².h),截留率为97.2%;中空纤维反渗透膜在0.7MPa、室温条件下,对0.5g/L的NaCl水溶液通量可达12. 2L/(m².h),截留率96.5%。

关键词: 中空纤维, 界面聚合, 反渗透, 纳滤, 复合膜

CLC Number: 

• TQ028.8