间苯二甲胺为单体制备耐氯复合纳滤膜及其性能
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摘要
以间苯二甲胺(mXDA)为胺类单体与均苯三甲酰氯(TMC)反应,制备了1种耐氯复合纳滤膜,对其表面组成、结构进行了表征,并通过改变缓冲体系、调节界面反应条件,对该纳滤膜的性能进行优化。结果表明,界面聚合反应后在底膜上成功制备了聚酰胺层。在水相单体m XDA、油相单体TMC的质量分数分别为0.1%、0.075%,反应时间30 s、热处理时间10 min的优化条件下,复合纳滤膜对Na_2SO_4的截留率达94.5%,通量56.4 L/(m~2·h)。而且该膜在活性氯的质量浓度为5 g/L时浸泡1 h仍能保持完整的功能层结构,在截留率基本保持不变的情况下水通量提升33%。
A chlorine-tolerant nanofiltration membrane was successfully prepared by interfacial polymerization of mXDA with TMC. To optimize the performance of the nanofiltration membrane, the surface composition and structure were characterized, the buffer system was changed and the conditions of interfacial reaction were adjusted. The results showed that the polyamide layer was successfully prepared on the substrate membrane. Under the optimal conditions of mass fraction of aqueous phase monomer of m-XDA and oil phase monomer of TMC was 0.1% and 0.075% respectively, reaction time was 30 s and thermal treatment time was 10 min, the rejection of Na_2SO_4 reached 94.5% by composite nanofiltration membrane and the flux was 56.4 L/(m~2·h). The surface composition and structure of the nanofiltration membrane did not change significantly after the chlorine soaking for 1 h, when mass concentration of active chlorine was 5 g/L, the water flux increased by 33% with rejection unchanged.
A chlorine-tolerant nanofiltration membrane was successfully prepared by interfacial polymerization of mXDA with TMC. To optimize the performance of the nanofiltration membrane, the surface composition and structure were characterized, the buffer system was changed and the conditions of interfacial reaction were adjusted. The results showed that the polyamide layer was successfully prepared on the substrate membrane. Under the optimal conditions of mass fraction of aqueous phase monomer of m-XDA and oil phase monomer of TMC was 0.1% and 0.075% respectively, reaction time was 30 s and thermal treatment time was 10 min, the rejection of Na_2SO_4 reached 94.5% by composite nanofiltration membrane and the flux was 56.4 L/(m~2·h). The surface composition and structure of the nanofiltration membrane did not change significantly after the chlorine soaking for 1 h, when mass concentration of active chlorine was 5 g/L, the water flux increased by 33% with rejection unchanged.
引文
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[2]徐又一,徐志康.高分子膜材料[M].北京:化学工业出版社材料科学与工程出版中心,2005.
[3]SAEKI D,IMANISHI M,OHMUKAI Y,et al.Stabilization of layerby-layer assembled nanofiltration membranes by crosslinking via amide bond formation and siloxane bond formation[J].Journal of Membrane Science,2013,447(22):128-133.
[4]MOBARAKABAD P,MOGHADASSI A R,Hosseini S M.Fabrication and characterization of poly(phenylene ether-ether sulfone)based nanofiltration membranes modified by titanium dioxide nanoparticles for water desalination[J].Desalination,2015,365(3):227-233.
[5]李洪懿,翟丁,周勇,等.纳米聚苯胺改性聚哌嗪酰胺纳滤膜的制备[J].化工学报,2015,66(1):142-148.
[6]SORRIBAS S,GORGOJO P,T魪LLEZ C,et al.High flux thin film nanocomposite membranes based on metal-organic frameworks for organic solvent nanofiltration.[J].Journal of the American Chemical Society,2013,135(40):15201-15208.
[7]YU S,MA M,LIU J,et al.Study on polyamide thin-film composite nanofiltration membrane by interfacial polymerization of polyvinylamine(PVAm)and isophthaloyl chloride(IPC)[J].Journal of Membrane Science,2011,379(1):164-173.
[8]HU D,XU Z L,WEI Y M.A high performance silica-fluoropolyamide nanofiltration membrane prepared by interfacial polymerization[J].Separation&Purification Technology,2013,110(5):31-38.
[9]张兆利,王枢,郭竹洁,等.耐氧化芳香聚酰胺纳滤膜的研究进展[J].化工进展,2011,30(10):2240-2246.
[10]张家恒,李俊俊,叶谦,等.一种荷负电复合纳滤膜的制备及表征[J].水处理技术,2017,43(12):61-65.
[11]XIANG J,XIE Z,HOANG M,et al.Effect of amine salt surfactants on the performance of thin film composite poly(piperazine-amide)nanofiltration membranes[J].Desalination,2013,315(8):156-163.
[12]夏敏玲,潘巧明.1种荷正电纳滤膜的制备[J].化工生产与技术,2014,21(3):16-19.
[13]CHEN S H,CHANG D J,LIOU R M,et al.Preparation and separation properties of polyami-de nanofiltration membrane[J].Journal of Applied Polymer Science,2010,3(5):1112-1118.
[14]HU D,XU Z L,WEI Y M.A high performance silica-fluoropolyamide nanofiltration membrane prepared by interfacial polymerization[J].Separation&Purification Technology,2013,110(5):31-38.