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以壳聚糖与三甲基一烯氯化铵共聚物(GCTACC)的水溶液为铸膜液,采用流延的方式,与聚丙烯腈(PAN)超滤膜复合,与己二酸和乙酸酐混合酸酐的丙酮溶液进行交联,从而制备了壳聚糖与三甲基一烯基氯化铵共聚物复合阳离子型纳滤膜。本文讨论交联剂浓度、交联时间、干燥时间等因素的影响,采用单因素实验法确定了最佳的制膜条件:1.0wt%壳聚糖与三甲基一烯氯化铵接枝共聚物溶液,50℃下干燥2h,交联介质为在乙酸酐、己二酸和丙酮的质量比为0.06:1.8:75时,50℃下交联20h,50℃下热处理20min。通过电镜扫描对膜形貌进行表征以及利用原子力显微镜对膜表面的粗糙情况进行了观察。该复合膜的均方粗糙度为7.7±0.76×103nm。在操作压力为1.0MPa,料液流速为30L/h下,通过测定对浓度为1000mg/L葡萄糖、蔗糖、聚乙二醇(600～1000)的截留率,得到该膜截留分子量为900左右(纳滤范围内)。并且,对该复合膜的截留性能进行了测试,分别探讨了操作压力、料液流速、料液类型等因素与膜性能的关系。其中,对不同类型无机盐的截留顺序为:MgCl2>MgSO4>KCl>NaCl>Na2SO4>K2SO4,呈现荷正电纳滤膜的截留特性。
An aqueous solution of chitosan and trimethyl ammonium chloride copolymer (GCTACC) was used as a casting solution. The casting solution was cast on a polyacrylonitrile (PAN) ultrafiltration membrane and mixed with adipic acid and acetic anhydride Mixed anhydride solution of acetone cross-linked to prepare a chitosan and trimethyl ammonium chloride copolymer cationic composite nanofiltration membrane. In this paper, the effects of cross-linking agent concentration, crosslinking time, drying time and other factors were discussed. The optimum conditions of film formation were determined by one-factor experiment: 1.0wt% chitosan and trimethyl- The solution was dried at 50 ° C. for 2 h. The crosslinking medium was crosslinked at 50 ° C. for 20 h with a mass ratio of acetic anhydride, adipic acid and acetone of 0.06: 1.8: 75, and heat-treated at 50 ° C. for 20 min. The morphology of the membrane was characterized by SEM and the roughness of membrane surface was observed by atomic force microscopy. The mean square roughness of the composite film was 7.7 ± 0.76 × 103 nm. Under the operating pressure of 1.0MPa and the liquid flow rate of 30L / h, the cut-off of glucose, sucrose and polyethylene glycol (600 ~ 1000) at the concentration of 1000mg / L was determined. Nanofiltration range). And the interception performance of the composite membrane was tested. The relationship between the operation pressure, the flow rate of the liquid and the type of the liquid and the properties of the membrane were discussed respectively. Among them, the interception order of different types of inorganic salts is: MgCl 2> MgSO 4> KCl> NaCl> Na 2 SO 4> K 2 SO 4.