氧化石墨烯高压膜的制备及其在水处理中的应用研究进展

Research progress on the application of graphene oxide in preparation of highpressure membranes for water purification

氧化石墨烯(GO)是一种理想的二维结构分离膜材料。从GO结构性质入手,探讨了GO混合基质膜和GO层压膜(GO膜)的制备及其在水处理中的研究现状与前景。分析了GO的添加方式对混合基质膜性能的影响,未来需要进一步对GO表面的活性基团进行改性以提高其分散性和与聚合物的相容性,并加强GO及改性GO的添加方式对膜性能影响的研究。GO混合基质膜在一定程度上可克服传统聚合物膜的Trade-off效应,技术成熟度较高、应用前景较好。GO膜在水溶液中的不稳定性是其在水处理中应用中的瓶颈,在系统分析提高GO膜稳定性的方法的基础上,进一步指出需要探讨采用新型交联剂或多种稳定方法同步强化其稳定性的可行性,同时其在实际应用中的稳定性及长期运行效果需要进一步研究和验证,以利于开拓其应用。

Graphene oxide(GO)as a two-dimensional material is ideal for membrane fabrication.In this review,the preparation of GO mixed matrix membrane and GO-based membrane and their application in water treatment were discussed.From the perspective of membrane preparation,the effects of the addition method of GO on the performance of mixed matrix membranes and the methods to improve the stability of GObased membranes were discussed.For mixed matrix membranes,the functional groups of GO need to be modified to improve its dispersibility and compatibility with the polymer matrix,and the effect of addition methods on the performance of nanofiltration membranes should be further studied.GO mixed matrix membranes can overcome the trade-off effect to some extent,and have high technical maturity and good application prospects.For GO-based membrane,the instability in water limits its application in water treatment.To overcome this bottleneck,the methods to improve the stability is comprehensively reviewed.The new type of crosslinker and or multiple stabilization methods should be developed.More importantly,the long-term stability of GO-based membranes in water needs further investigation for real application.