摘要
利用前驱体N,N-双(3-氨丙基)甲胺(BAMA)和1,3-二氨基-2-羟基丙烷(DAP)分别合成两种分子尺寸不同的两性离子二胺单体N,N-双(3-氨丙基)甲胺丙烷磺酸(BAMAPS)和2-N,N-二甲基丙二胺丙烷磺酸(DAPPS),分别利用前驱体、两性离子二胺单体与PIP共同组成为水相溶液,与TMC通过界面聚合制备复合纳滤膜,并以二次界面聚合的方式将两性离子二胺单体引入到纳滤膜中。利用ATR/FTIR、SEM和接触角测定仪对膜进行表征,并考察单体结构,加入方式和单体含量对纳滤膜性能的影响。结果表明,前驱体、二胺基两性离子都被成功引入到纳滤膜的聚酰胺分离层中,随着水相组成中两性离子二胺单体含量增加,纳滤膜的亲水性增强,水通量提高而截留性能下降。BAMA和BAMAPS的分子结构较长,与分子长度较短的DAP和DAPPS相比,制备的纳滤膜水通量更高,截留性能下降。研究表明,侧基较长的二胺单体的位阻效应较强,使哌嗪聚酰胺链段形成大孔结构,导致无机盐截留率下降,水通量增加。结果表明,二胺单体的链长对于纳滤膜的渗透和分离性能有重要影响。
Two amphoteric diamine monomers N,N-bis(3-aminopropyl)methylamine propane sulfonic acid(BAMAPS)and 2-N,Ndimethylpropylene propylene sulfonic acid(DAPPS)with different molecular sizes were synthesized,respectively,using the precursors N,N-bis(3-aminopropyl)methylamine(BAMA)and 1,3-diamino-2-hydroxypropane(DAP).The precursor,amphoteric diamine monomer and PIP were used to form aqueous solution,respectively,and the composite nanofiltration membrane was prepared by interfacial polymerization with TMC,and the amphoteric diamine monomer was introduced into the nanofiltration membrane by secondary interfacial polymerization.The membrane was characterized by ATR/FTIR,SEM and contact angle analyzer,and the effects of monomer structure,addition method and monomer content on the performance of nanofiltration membrane were investigated.The results showed that both the precursors and diamine amphoteric ions were successfully introduced into the polyamide separation layer of nanofiltration membrane.With the increase of the content of amphoteric amphoteric diamine monomer in water phase composition,the hydrophilicity of nanofiltration membrane increased,the water flux increased,but the interception performance decreased.Compared with DAP and DAPPS with shorter molecular length,the nanofiltration membranes prepared by BAMA and BAMAPS have higher water flux and lower interception performance.The diamine monomers with long side groups have strong steric hindrance effect,which leads to the formation of large pore structure of piperazine polyamide chain segment,resulting in the decrease of inorganic salt rejection rate and the increase of water flux.The chain length of diamine monomer has an important effect on the permeability and separation performance of nanofiltration membranes.
作者
王新乐
刘铭辉
于海军
刘中楠
王聪
付晓燕
WANG Xinle;LIU Minghui;YU Haijun;LIU Zhongnan;WANG Cong;FU Xiaoyan(CNOOC EnerTech-Safety&Environmental Protection Co.,Tianjin 300457,China;Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;Liu Zhongnan,Blue Star Engineering Co.LTD,101318,China;Dalian Ecological Environment Monitoring Center,Liaoning Province,Dalian 116023,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2022年第12期83-88,102,共7页
Technology of Water Treatment
基金
海油发展科技项目“高性能膜法油水分离技术”(HFKJ-CGXM-AQ-2020-01)
大连市科技创新基金应用基础研究项目“新型碟管式反渗透膜组件研发”(2019J12SN67)
辽宁省自然科学基金“新型油水分离膜的制备与应用基础研究”(2019-MS-313)。
关键词
纳滤膜
两性离子二胺单体
空间位阻
二次界面聚合
nanofiltration membrane
amphoteric diamine monomer
steric hindrance
secondary interfacial polymerization
