聚酰胺反渗透复合膜的多巴胺改性研究  

STUDY ON POLYDOPAMINE MODIFICATION OF POLYAMIDE REVERSE OSMOSIS MEMBRANE

作　　者：岳鑫业[1] 刘文超[1] 周勇[1] 谭昊[2] 

机构地区：[1]杭州水处理技术研究开发中心,310012 [2]浙江水利水电学院市政系,浙江杭州310018

出　　处：《水处理技术》2014年第4期31-34,37,共5页Technology of Water Treatment

基　　金：国家重点基础研究发展计划(973)项目(2009CB623402)

摘　　要：采用多巴胺对聚酰胺反渗透复合膜(RO)进行表面改性来提高膜的亲水性和耐污染性能。考察了不同改性条件(如多巴胺浓度、沉积时间、氧化剂添加)对膜水通量、盐截留、牛血清白蛋白(BSA)吸附的影响。研究结果表明,在碱性环境(pH=8.5)下多巴胺可以在RO表面发生氧化自聚、沉积形成聚多巴胺超薄层,适量氧化剂-过硫酸铵的加入可以加快多巴胺在RO表面的沉积;多巴胺改性后的RO膜水通量和盐截留均未有明显降低;水接触角测试结果显示,RO膜经多巴胺改性后的亲水性明显得到改善;X光电子能谱结果证明,多巴胺改性的RO膜成功引入了聚多巴胺层;扫描电镜对聚多巴胺改性的RO膜表面形态结构进行了表征;BSA吸附实验表明,聚多巴胺改性的RO膜能有效减少BSA的吸附。Polyamide reverse osmosis membrane （RO） was surface-modified by polydopamine deposition in mild aqueous buffer environments. The influence of various deposition conditions （i.e., dopamine concentration, deposition time and 3xidant） on water flux, salt rejection, and bovine serum albumin （BSA） adhesion of reverse osmosis membrane was investigated. The results show that polydopamine deposition was achieved at alkaline buffer pH value, and the addition of adequate oxidant promoted the polydopamine deposition. After polydopamine modification, the RO membrane is almost no change in water flux and salt rejection compared to the original membrane. BSA adhesion experiment revealed that polydopamine deposition reduced the BSA adsorption on membrane surface. X-ray photoelectron spectroscopy （XPS） was used to determine the chemical composition of membrane surface, which confirmed the successful introduction of polydopamine. Scanning electron microscopy （SEM） was used to characterize the surface morphology of original membrane and modified membrane. Water contact angle measurement results indicated that the hydrophilicity of the reverse osmosis membrane was remarkably enhanced after polydopamine deposition.

关 键 词：聚酰胺 反渗透膜 多巴胺 亲水性 BSA 

分 类 号：TQ028.8[化学工程]