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A facile approach for preparation of positively charged nanofiltration membranes by in-situ crosslinking between polyamide-imide and polyethylenimine
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2018-06-07 , DOI: 10.1016/j.seppur.2018.06.020
Aydın Cihanoğlu , Sacide Alsoy Altinkaya

Polyamide-imides (PAI) are attractive materials for membrane formation due to their high chemical and thermal stability. In this study, we report a facile approach for preparing positively charged nanofiltration (NF) membranes using a one-step process. Polyethylenimine (PEI) was dissolved in a coagulation bath and formed in-situ ionic crosslinking with PAI during phase inversion. The membranes were characterized by attenuated total reflectance Fourier Transform Infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), atomic force microscopy (AFM), contact angle and zeta potential measurements. The most positively charged membrane was obtained when the pH of the coagulation bath was adjusted to 10. This membrane showed a significant decrease in contact angle and surface roughness and increase in the pure water permeability (PWP) compared to the plain PAI membrane. The salt rejection performance of the crosslinked PAI membrane was measured using MgCl2, CaCl2, NaCl and Na2SO4 salts. The rejection of Mg2+ and Ca2+ ions was found to be 95.6% and 90.2%, respectively. The crosslinked membrane showed excellent chemical stability when stored in HCl solution at pH 3 up to 7 days. Antifouling behaviour of the optimized membrane was tested using bovine serum albumin (BSA) and flux recovery ratio of the membrane was found to be 92.2% at the end of 3 h filtration. The results suggest that the positively charged PAI membranes crosslinked with PEI may have a potential in recovering valuable cationic metals from acid mine wastewater.



中文翻译:

通过聚酰胺-酰亚胺和聚乙烯亚胺之间的原位交联制备带正电荷的纳滤膜的简便方法

聚酰胺酰亚胺(PAI)由于具有很高的化学稳定性和热稳定性,是形成膜的诱人材料。在这项研究中,我们报告了一种使用一步法制备带正电荷的纳滤(NF)膜的简便方法。将聚乙烯亚胺(PEI)溶解在混凝浴中,并在相转化过程中与PAI形成原位离子交联。膜的特征在于衰减全反射傅里叶变换红外光谱(ATR-FTIR),扫描电子显微镜(SEM),能量色散X射线分析(EDX),原子力显微镜(AFM),接触角和Zeta电位测量。将凝结浴的pH调节至10时,可获得带正电的膜。与普通PAI膜相比,该膜的接触角和表面粗糙度显着降低,并且纯水渗透率(PWP)增加。使用MgCl测量交联的PAI膜的除盐性能2,CaCl 2,NaCl和Na 2 SO 4盐。发现Mg 2+和Ca 2+离子的截留率分别为95.6%和90.2%。当在pH 3的HCl溶液中保存长达7天时,交联膜显示出优异的化学稳定性。使用牛血清白蛋白(BSA)测试了优化过的膜的防污性能,在3 h过滤结束时,膜的通量回收率为92.2%。结果表明,与PEI交联的带正电的PAI膜可能具有从酸性矿山废水中回收有价值的阳离子金属的潜力。

更新日期:2018-06-07
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