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
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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