A graphene oxide/chitosan polyelectrolyte layer was used to modify the surface of a polyvinyl alcohol/tetraethyl orthosilicate membrane by layer-by-layer interfacial complexation and, thus, improve the pervaporation characteristics. The interfacial complexation between the chitosan and graphene oxide was confirmed by Fourier-transform infrared and X-ray photoelectron spectroscopy; the changes in surface hydrophilicity after layer-by-layer modification were examined by contact angle measurements, and the morphology of the layer-by-layer membrane was elucidated by field-emission scanning electron microscopy analysis. The pervaporation performance of the modified membranes was evaluated by performing the separation of water-isopropanol (IPA) azeotropes under different operating conditions. In the pervaporation experiments, the best performance was obtained using a membrane with 15 chitosan-GO layers (denoted 15L-L(CH-GO)). For this membrane, the flux increased from 13.6 to 76.4 g/m²h and the separation factor decreased from 56,720 to 4,001 as the feed temperature was varied from 30 to 60 °C for an 80: 20 (w/w) IPA/water feed. The apparent permeation activation energies were calculated and that of IPA (122.8 kJ/mol) was greater than that of water (47.4 kJ/mol).

使用氧化石墨烯/壳聚糖聚电解质层通过逐层界面络合来改性聚乙烯醇/原硅酸四乙酯膜的表面，从而改善了全蒸发特性。壳聚糖和氧化石墨烯之间的界面络合通过傅里叶变换红外和X射线光电子能谱确定。通过接触角测量来检查逐层修饰后表面亲水性的变化，并通过场发射扫描电子显微镜分析来阐明逐层膜的形态。通过在不同的操作条件下进行水-异丙醇（IPA）共沸物的分离来评估改性膜的全蒸发性能。在渗透蒸发实验中 使用具有15个壳聚糖-GO层的膜（表示为15L-L（CH-GO））可获得最佳性能。对于这种膜，通量从13.6 g / m增加到76.4 g / m²小时后，对于80:20（w / w）IPA /水进料，进料温度从30变为60°C，分离系数从56,720降至4,001。计算了表观渗透活化能，并且IPA的表观渗透活化能（122.8kJ / mol）大于水的表观渗透活化能（47.4kJ / mol）。