CMC/PAAS共混复合纳滤膜的制备及性能研究  

Preparation and properties of composite nanofiltration membrane by blending with CMC and PAAS

作　　者：张晓飞[1] 白云翔[1] 张春芳[1] 孙余凭[1] 顾瑾[1] 

机构地区：[1]江南大学食品胶体与生物技术教育部重点实验室化学与材料工程学院,江苏无锡214122

出　　处：《现代化工》2016年第6期113-116,共4页Modern Chemical Industry

基　　金：国家自然科学基金项目(21576114)

摘　　要：利用涂覆交联的方法,以羧甲基纤维素钠(CMC)和聚丙烯酸钠(PAAS)的共混液为活性层铸膜液,水解的聚丙烯腈(PAN)超滤膜为支撑层,Fe(NO_3)_3水溶液为交联剂,制备了一种新型共混复合纳滤膜。其最佳制备条件为:CMC/PAAS共混质量比为4∶1,交联剂浓度为0.125 mol/L,交联时间为2.5 h。利用全反射红外光谱(ATR-IR)、扫描电镜(SEM-EDAX)对膜结构进行表征。结果表明,Fe^(3+)能够有效地交联活性层与支撑层,形成结构稳定的纳滤膜。纳滤膜对无机盐的截留按以下顺序依次降低:Na_2SO_4、Na Cl、Mg SO_4、Mg Cl_2,表现出荷负电纳滤膜的截留特征。在连续运行24 h后,纳滤膜的纯水通量仍可达到7 L/m^2·h,截留率约为85%,显示了较好的稳定性能。A new type of blend composite nanofiltration membrane is prepared by the coating and crosslinking methods,with the blend solution of sodium carboxymethyl cellulose（ CMC） and sodium polyacrylate（ PAAS） as active layer,PAN UF membrane as support layer and Fe（ NO3）3 aqueous solution as crosslinking agent. The nanofiltration membrane with excellent rejection performance is prepared under the following conditions： 4∶ 1 of mass ratio of CMC and PAAS,0. 125 mol / L of crosslinking agent concentration and 2. 5 h of crosslinking time. The structure of the nanofiltration membrane is characterized by ATR-IR and SEM-EDAX. The results show that Fe～（3＋）can effectively crosslink the support layer and the active layer,forming a stable structure of the blend nanofiltration membrane. The rejection rate of the nanofiltration membrane to inorganic salt solution is decreased in the order of Na2SO4,Na Cl,Mg SO4 and Mg Cl2,showing a negatively charged nanofiltration membrane rejection characteristic. The nanofiltration membrane has a good stability performance. After 24 h of continuous operation,the water flux can still reach 7L / m^2 h while the rejection rate is about 85%.

关 键 词：羧甲基纤维素钠 聚丙烯酸钠 共混纳滤膜 

分 类 号：TQ028.8[化学工程]