氧化石墨烯在纳滤膜改性中的应用

Application of graphene oxide in nanofiltration membrane modification

传统超滤膜材料通常具有较强的疏水性,导致制备出的纳滤膜存在水通量较低、膜污染严重等问题,而通过对纳滤膜进行改性可有效解决这些问题.氧化石墨烯(GO)作为一种性能优异的新型碳材料,其表面附着了大量的羟基、羧基以及环氧基等极性基团,将其应用于纳滤膜的改性,可有效提高纳滤膜的亲水性、脱盐率以及膜表面的抗污染性等.本文介绍了利用氧化石墨烯(GO)改性纳滤膜的几种常用方式与应用,探究了GO复合纳滤膜稳定性、亲水性、脱盐率以及抗污染性提高的机理,分析了氧化石墨烯(GO)改性纳滤膜的优势以及存在的问题,为GO复合纳滤膜的发展和应用提供指导.

Traditional ultrafiltration membrane materials usually have strong hydrophobicity, which leads to the low water flux and serious membrane pollution in the prepared nanofiltration membrane(NF). However, modifying the NF can effectively solve these problems. As a new type of carbon material with excellent performance, the surface of graphene oxide(GO) was attached by a large number of polar groups such as hydroxyl, carboxyl and cyclo-oxygen groups. Application of GO in the modification of NF can effectively improve the hydrophilicity, desalination rate and anti-pollution properties on membrane surface, etc. This paper introduced several common modification methods of NF by GO and application of GO-composite NF, investigated the mechanisms for improving the stability, hydrophilic, desalination rate and anti-fouling properties of GO-composite NF, and analyzed the advantages and existing problems in the GO-composite NF. It provided guidance for the development and application of GO-composite NF.