5-异氰酸酯异肽酰氯/ZnO/超支化聚酰胺纳滤膜的制备及性能EI北大核心CSCD

为获得大通量抗污染纳滤膜,通过5-异氰酸酯异肽酰氯(ICIC)与超支化聚酰胺(HBPA)在聚丙烯腈(PAN)超滤膜表面的界面聚合反应,将纳米氧化锌引入聚酰胺分离层制备ICIC/ZnO/HBPA纳滤膜。扫描电镜(SEM),X射线能谱分析证实ZnO的存在;接触角测试结果显示,引入ZnO后膜表面亲水性增强,最小接触角为22.7°。与未加ZnO相比,加入ZnO的膜通量增大了约2.6倍,为102 L·m^-2·h^-1,且对NaCl,MgCl 2,Na2SO4和MgSO4的截留率提高。随着ZnO用量的增加,膜对大肠杆菌抑菌性增强。适当增大单体含量或延长界面聚合时间有利于提高膜对无机盐的截留率,但截留率顺序发生变化。当HBPA含量为0.8%(质量分数,下同)、ICIC含量为0.1%、ZnO用量为0.02 g、反应时间为10 min时,制备的纳滤膜对NaCl,MgCl2,Na2SO4和MgSO 4的截留率分别为60.8%,96.4%,95.1%,96.7%,通量分别达到53,54.7,53.7 L·m^-2·h^-1和54.7 L·m^-2·h^-1。

Preparation and characterization of 5-isocyanato-isophthaloyl chloride/ZnO/hyperbranched polyamide nanofiltration membranes

In order to obtain high-flux antifouling nanofiltration membrane,a series of ICIC/ZnO/HBPA nanofiltration membranes were prepared by interfacial polymerization of 5-isocyanato-isophthaloyl chloride(ICIC)and hyperbranched polyamide(HBPA)on the surface of polyacrylonitrile(PAN)ultrafiltration membrane,the nano-ZnO was incorporated into the polyamide separation layer.The existence of ZnO is confirmed by scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS).The analysis results of water contact angle indicate that the membrane hydrophilicity is increased by incorporation of ZnO nanoparticles,the lowest water contact angle of the membrane is 22.7°.Compared with the membrane without ZnO,the flux and the salt rejection rate for NaCl,MgCl2,Na2SO4 and MgSO4 of the membrane containing ZnO increase.The largest flux of the ICIC/ZnO/HBPA membrane is about 102 L·m^-2·h^-1,which is nearly 2.6 times of the membrane without ZnO.The bacteriostasis of the membranes to E.coli is enhanced by incorporation more ZnO.Increasing the monomer content or prolonging the interfacial polymerization time is beneficial to increasing the salt rejection rate,but the order of the salt retention rate is changed.When HBPA is 0.8%,ICIC is 0.1%,content of ZnO is 0.02 g and reaction time is 10 min,the salt rejection rate for NaCl,MgCl2,Na 2SO4 and MgSO 4 of the prepared membrane are 60.8%,96.4%,95.1%,96.7%and the flux is 53,54.7,53.7 L·m^-2·h^-1 and 54.7 L·m^-2·h^-1,respectively.