多巴胺辅助聚乙烯亚胺沉积交联的复合纳滤膜制备（英文）

发布时间：2018-02-25 21:45

本文关键词： 多巴胺共沉积纳滤膜耐碱性　出处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2017年02期 　论文类型：期刊论文

【摘要】：目的:利用多巴胺改性构建一种简单制备荷正电复合纳滤膜,解决多巴胺类改性材料耐碱性差的问题。创新点:1.利用共沉积技术与交联反应成功制备了荷正电复合纳滤膜;相较于传统多巴胺改性膜,该复合膜的稳定性大大提高。2.经过测试表征,制备得到的纳滤膜的分离尺寸属于疏松纳滤膜范围,可用于相应尺度的分离领域。方法:1.通过多巴胺与聚乙烯亚胺共沉积,首先实现二者的表面沉积,随后通过交联剂交联制备复合膜(图1);2.对改性膜前后表面理化性质进行相应表征(表2和图3~6);3.通过测试通量和截留等性能及分析相关纳滤模型,表征该复合膜分离性能(图7和8,公式(5)和(7));4.通过长期分离测试及碱性溶液清洗,测试复合膜的稳定性和耐碱性。结论:1.成功制备了具有荷正电性的复合纳滤膜;2.通过通量和截留数据拟合分析得出该膜截留尺寸在1.5 nm和2 nm之间,属于疏松纳滤膜,可用于相应尺度分离;3.该复合膜具有良好的稳定性及耐碱性,应用范围更广。
[Abstract]:Objective: to construct a simple positively charged composite nanofiltration membrane with dopamine modification to solve the problem of poor alkali resistance of dopamine modified materials. 1. The positive charge composite nanofiltration membrane was successfully prepared by co-deposition and cross-linking reaction. Compared with the traditional dopamine modified membrane, the stability of the composite membrane is greatly improved. 2. The separation size of the prepared nanofiltration membrane belongs to the loose nanofiltration membrane. Method: 1.Through co-deposition of dopamine and polyethyleneimide, the surface deposition of dopamine and polyethyleneimine can be realized. Then the composite membrane was prepared by crosslinking with crosslinking agent (fig. 1 / 2). The physical and chemical properties of the surface before and after the modified membrane were characterized (Table 2 and fig. 3). The flux and retention properties were tested and the related nanofiltration models were analyzed. The separation properties of the composite membrane (figs. 7 and 8, formula 5) and the composite membrane were characterized by long term separation test and alkaline solution cleaning. The stability and alkalinity resistance of the composite membrane were tested. Conclusion: 1. The composite nanofiltration membrane with positive charge was successfully prepared. Through the fitting analysis of flux and interception data, it was found that the size of the membrane was between 1.5 nm and 2 nm, which was a loose nanofiltration membrane. The composite membrane has good stability, alkali resistance and wide application range.
【作者单位】： MOE
【基金】：supported by the National Natural Science Foundation of China(Nos.51273176 and 51573159) the Fundamental Research Funds for the Central Universities(No.2016QNA4032),China
【分类号】：TQ051.893

【相似文献】