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氧化石墨烯改性聚乙烯亚胺/木质素磺酸钠纳滤膜的制备及性能研究

作者：耿欣，严庆，姚媛媛，李继定，雷建都，王璐莹

单位： 1. 北京林业大学林木生物质化学北京市重点实验室，北京 100083； 2. 清华大学化学工程国家重点实验室，北京 100084

关键词：纳滤膜；层层自组装；氧化石墨烯；木质素磺酸钠；聚乙烯亚胺

DOI号：

分类号： O636.2; TQ 028.8

出版年,卷(期):页码： 2021,41(3):37-43

摘要：

在聚乙烯亚胺（PEI）/木质素磺酸钠（SL）纳滤膜的基础上，利用层层自组装技术，制备了氧化石墨烯（GO）改性的PEI/SL纳滤膜，通过ATR-FTIR、XPS、SEM等表征手段研究添加GO对复合膜结构的影响。结果表明GO加入PEI或SL不影响自组装过程，并可嵌入改性膜的分离层内，且发现GO在PEI中的分散性优于其在SL中的分散性。在1.0 MPa操作压力下，GO改性膜分离2 g/L MgSO4溶液的纳滤性能测试结果显示，GO在PEI溶液中添加量为0.025 g/L和0.035 g/L时性能较优，在SL溶液中添加量为0.015 g/L和0.025 g/L时性能较优，其中最优膜截留率可达90%，较未改性的PEI/SL膜提高了19%。本文通过层层自组装法制备的GO改性的新型纳滤膜，为改善纳滤膜性能提供了参考。

On the basis of polyethyleneimine (PEI)/sodium lignosulphonate (SL) nanofiltration membranes, graphene oxide (GO) modified PEI/SL nanofiltration membranes were prepared through layer-by-layer assembly technology. The characterizations, such as ATR-FTIR, XPS, SEM, have be used to study the influence of GO on the structure of the composite membrane. The results show that the self-assembly process can successfully prepare GO modified PEI/SL membranes, in which the GO sheets are incorporated in the PEI/SL layer. It is also found that the GO distributes better in PEI than that in SL. Then the nanofiltration performance, tested by using 2 g/L MgSO4 solution at the operating pressure of 1.0 MPa, indicates that the separation performance is improved when 0.025 g/L to 0.035 g/L GO dispersed in the PEI solution or 0.015 g/L to 0.025 g/L GO dispersed in SL solution. The optimal membrane exhibits the rejection reaching 90%, which is 19% higher than the PEI/SL membrane. In this paper, the GO modified nanofiltration membrane prepared by layer-by-layer self-assembly method can be provide a reference for the improvement in nanofiltration performance.

基金项目：

中央高校基本科研业务费专项资金 (2019ZY01); 国家自然科学基金 (21736001、21776153、21978024).

作者简介：

耿欣（1996年-），女，河南安阳人，硕士，从事方向为膜材料与膜改性方面的研究.

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