Graphene oxide (GO)-based membranes have received increasing attention recently in liquid separation field. However, the abundant hydrophilic groups of GO nanosheets would cause instability of GO-based membranes under hydrated conditions. In addition, GO-based membranes often suffer from severe membrane fouling in practical application. In this study, polydopamine (PDA) crosslinked GO was synthesized by simply immersing GO into the dopamine alkaline solution and used to prepare GO@PDA/PES composite membranes. Then, a zwitterionic polymer, synthesized by quaterisation reaction of polyethyleneimine (PEI) and sodium chloroacetate, was grafted on the surface of PDA crosslinked GO membrane via Michael addition reaction between amino groups of PEI and quinone groups of PDA. The bonding between GO nanosheets reinforced the structural stability, resulting in the formation of water stable membranes. The grafted zwitterionic polymer coating could improve the membrane surface hydrophilicity, endowing the membranes promising anti-fouling ability. The resulting membrane achieved a flux of 49.5 L m⁻² h⁻¹ bar⁻¹ with relatively high rejection of about 100%, 82% and 67% for Congo Red, Orange G and Methyl Orange respectively. The membrane exhibited good anti-fouling properties as well as structural stability under alcohol environments, showing considerable potential in water treatment.

基于氧化石墨烯（GO）的膜最近在液体分离领域中受到越来越多的关注。但是，GO纳米片的丰富亲水基团会在水合条件下引起基于GO的膜的不稳定性。另外，基于GO的膜在实际应用中经常遭受严重的膜污染。在这项研究中，通过简单地将GO浸入多巴胺碱性溶液中即可合成聚多巴胺（PDA）交联的GO，并用于制备GO @ PDA / PES复合膜。然后，将聚乙烯亚胺（PEI）和氯乙酸钠的季铵化反应合成的两性离子聚合物通过PEI的氨基和PDA的醌基之间的迈克尔加成反应接枝到PDA交联的GO膜的表面上。GO纳米片之间的粘合增强了结构稳定性，导致形成水稳定的膜。接枝的两性离子聚合物涂层可以改善膜表面的亲水性，赋予膜有希望的防污能力。所得膜的通量为49.5 L m^-2 h ^-1 bar ^-1，刚果红，橙G和甲基橙的相对较高的截留率分别约为100％，82％和67％。该膜表现出良好的防污性能以及在酒精环境下的结构稳定性，在水处理中显示出巨大的潜力。