Composite anion exchanges membranes are prepared by incorporating quaternized graphene oxide (QGO) within poly(vinyl alcohol) (PVA) or the mixture of PVA and quaternized polyethyleneimine (QPEI), followed by cross-linking with formaldehyde. The PVA-QGO series of membranes have low ion exchange capacities (IECs) of 0.10–0.37 mmol/g and low water uptakes (W_R) of 16.1%–22.0%, leading to high area resistances (>60 Ω cm²). The PVA-QPEI-QGO series of membranes show much lower area resistances of 2.47–6.04 Ω cm², which is ascribed to the improved IECs (0.86–1.37 mmol/g) and W_R (46.8%–71.4%). Both series of membranes show higher alkali resistance than commercial membrane AMV. Their weight losses are in the range of 0.5%–8.9% after immersion in 60 °C 2 mol/L NaOH alkaline solution for 32 days, while the value of AMV membrane is 19.2%. When utilized for electrodialysis (ED) application to recover NaOH from NaOH/Na₂WO₄ mixture, the prepared membranes exhibit high selectivity, as evidenced by the low leakage ratio of Na₂WO₄. The leakage ratio of the optimized composite membrane to WO₄²⁻ is only 5.1%, while the leakage ratio of AMV membrane is up to 61.4%. To explore this reason, the composite membranes are selected for the ED separation of monovalent ions. The separation efficiency (S) of the optimized membrane is 83.9%, which is similar to the value of commercial anion selective membrane NEOSEPTA® ACS (88.7%), confirming further the selectivity of the composite membranes.

通过将季铵化氧化石墨烯（QGO）掺入聚乙烯醇（PVA）或PVA和季铵化聚乙烯亚胺（QPEI）的混合物中，然后与甲醛交联来制备复合阴离子交换膜。PVA-QGO系列膜的离子交换容量（IECs）为0.10–0.37 mmol / g，吸水率（W _R）为16.1％–22.0％，导致较高的面积电阻（> 60Ωcm ²）。PVA-QPEI-QGO系列膜的面积电阻低得多，为2.47–6.04Ωcm ²，这归因于改进的IEC（0.86–1.37 mmol / g）和W _R（46.8％–71.4％）。这两个系列的膜均显示出比市售膜AMV更高的耐碱性。在60°C 2 mol / L NaOH碱性溶液中浸泡32天后，它们的重量损失在0.5％–8.9％的范围内，而AMV膜的值为19.2％。当用于电渗析（ED）应用以从NaOH / Na ₂ WO ₄混合物中回收NaOH时，制得的膜表现出高选择性，如Na ₂ WO ₄的低泄漏率所证明。优化复合膜对WO ₄ ^2-的泄漏率仅为5.1％，而AMV膜的泄漏率高达61.4％。为了探索这个原因，选择复合膜用于ED分离单价离子。优化膜的分离效率（S）为83.9％，与商业阴离子选择性膜NEOSEPTA®ACS的值（88.7％）相似，进一步证实了复合膜的选择性。