介孔SiO2孔道结构对聚酰胺反渗透复合膜性能的影响  

Influence of mesoporous silica pore structure on the property of PA reverse osmosis composite membrane

作　　者：刘兆峰 何灿 朱桂茹[2] 刘淑琴[3] 王海增[2] Liu Zhaofeng;He Can;Zhu Guiru;Liu Shuqin;Wang Haizeng(National Institute of Clean-and-Low-Carbon Energy,Beijing102211;College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100;School of Chemical&Environmental Engineering,China University of Mining&Technology(Beijing),Beijing100083)

机构地区：[1]北京低碳清洁能源研究所,北京102211 [2]中国海洋大学化学化工学院,青岛266100 [3]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《化工新型材料》2020年第3期41-45,49,共6页New Chemical Materials

摘　　要：在界面聚合过程中,通过添加改进水热方法制备的球形介孔SiO2纳米材料,制备了改性的聚酰胺反渗透复合膜。使用扫描电镜、X射线衍射和氮气吸附-脱附等手段对制备的介孔SiO2纳米材料进行表征;采用反渗透膜评价装置、原子力显微镜、扫描电镜(SEM)和静态接触角仪器等手段对复合膜的性能和结构进行测试和表征;并对比了相同粒径大小的实心SiO2和介孔SiO2对膜渗透性能的影响。结果证明:成功合成了一种具有孔径分布均匀、粒径均一、比表面积较大、分散性较好的介孔SiO2纳米球形颗粒;SEM表征结果证实纳米材料在膜表面分布均匀,膜表面亲水性能提高,粗糙度变大;膜性能测试结果证实了介孔SiO2的添加使得膜在维持较高截留率的前提下,具有更高的水通量;同时,通过对比相同尺寸的实心SiO2作为添加材料,证实了介孔SiO2的孔道结构更有利于水分子的传输。当介孔SiO2添加质量为0.06%时,水通量由23L/(m2·h)提高至39L/(m2·h),对氯化钠的截留仍然维持在98%以上。A modified polyamide reverse osmosis composite membrane was prepared by doping spherical mesoporous silica nanoparticles which were synthesized by modified hydrothermal method.The silica nanoparticles were characterized by SEM,XRD and N2-adsorption and desorption.The properties and structures of the membranes were tested and characterized by reverse osmosis membrane evaluation device,AFM,SEM and static contact angle instrument.Effects of porous and nonporous silica nanoparticles with same particle size on the membrane permeability and selectivity were also compared.The results demonstrated the successful synthesis of the mesoporous silica nanoparticles with uniformed pore size distribution,uniformed particle size,large specific surface area,good dispersion and sphere structure.The SEM photographs confirmed that the nano-materials were uniformly distributed on the surface of the membrane and the membrane hydrophilicity was improved with larger surface roughness.Furthermore,the membrane with mesoporous silica had higher water flux than the one with solid silica of the same size,which implied that the mesoporous silica with pore structure was more conducive to the transport of water molecules.When the content of mesoporous silica was 0.06 wt%,the water flux increased from 23 L/(m2·h)to 39 L/(m2·h),while the rejection of sodium chloride remained above 98%.

关 键 词：介孔孔道 反渗透复合膜 SIO2 

分 类 号：TQ051.893[化学工程]