Liu Lulu, Wu Weilin, Jin Xiaogang, Luo Xiong, Wu Lili
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
School of Pharmaceutical Sciences, Hunan University of Medicine, No.492 South Jinxi Road, Huaihua 418000, China.
Polymers (Basel). 2023 Apr 24;15(9):2018. doi: 10.3390/polym15092018.
Nanofiltration membranes are of great significance to the treatment of dye wastewater. Interfacial polymerization is a widely used method to fabricate nanofiltration membranes. In this study, the interaction of tannic acid-assisted polyethylene polyamine (PEPA) with terephthalaldehyde (TPAL) was performed on PES ultrafiltration membranes using novel nitrogen-rich amine monomers and relatively less reactive aldehyde-based monomers. A new nanofiltration membrane ((T-P-T)/PES) was prepared by interfacial polymerization. Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy were used to analyze the elemental composition, bonding state, and surface morphology of the membrane surface. The effects of the PEPA deposition time, TPAL concentration, interfacial reaction time, and curing time on the nanofiltration layer were investigated. The modified membrane, prepared under optimal conditions, showed strong dye separation ability. The permeation of the modified membrane could reach 68.68 L·m·h·bar, and the rejection of various dyes was above 99%. In addition, the (T-P-T)/PES membrane showed good stability during long-term dye separation.
纳滤膜对染料废水的处理具有重要意义。界面聚合是制备纳滤膜广泛采用的方法。在本研究中，使用新型富氮胺单体和反应活性相对较低的醛基单体，在聚醚砜（PES）超滤膜上进行了单宁酸辅助的聚乙烯多胺（PEPA）与对苯二甲醛（TPAL）的相互作用。通过界面聚合制备了一种新型纳滤膜（(T-P-T)/PES）。利用傅里叶变换红外光谱、X射线光电子能谱和扫描电子显微镜对膜表面的元素组成、键合状态和表面形貌进行了分析。研究了PEPA沉积时间、TPAL浓度、界面反应时间和固化时间对纳滤层的影响。在最佳条件下制备的改性膜表现出很强的染料分离能力。改性膜的渗透通量可达68.68 L·m⁻²·h⁻¹·bar⁻¹，对各种染料的截留率均在99%以上。此外，(T-P-T)/PES膜在长期染料分离过程中表现出良好的稳定性。
