Abstract Sulfonated poly(ether ether ketone) (SPK)/imidized graphene oxide (IGO) composite cation exchange membrane (CEM) with varied composition was prepared and assessed as a promising candidate for water desalination by electrodialysis (ED). Incorporation of multi-functionalized ( SO3H and COOH) IGO in SPK matrix leads a high performance CEM with improved electrochemical and physicochemical properties (conductivity, permselectivity, water content and ion-exchange capacity), stabilities (thermal, mechanical, and chemical) essential for diversified electro-membrane processes. Due to the presence of multi-functional oxygenated groups, strong hydrogen bonding between IGO and SPK led suitable hydrophobic–hydrophilic architecture and formation of ionic clusters responsible for ion conducting channels. Well optimized SPK/IGO-8 composite CEM exhibited good water uptake (32.56%), ion-exchange capacity (2.16 meq·g−1), high permselectivity (0.87), and conductivity (5.40 × 10−2 S cm−1) due to high molality of sulphonic acid groups. Relatively high limiting current density (Ilim) value for SPK/IGO-8 composite CEM provide a broad window for applying high current density across the electrodialyser to achieve fast water desalination without any unwanted water splitting. Further, low frictional coefficient between counter-ion and membrane matrix plus good electrodialysis performance of SPK/IGO-8 composite CEM revealed its potential candidate for water desalination.

中文翻译：

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用于电渗析水淡化的具有改进的导电性和稳定性的磺化聚（醚醚酮）/酰亚胺化氧化石墨烯复合阳离子交换膜

摘要 制备了具有不同成分的磺化聚醚醚酮 (SPK)/酰亚胺化氧化石墨烯 (IGO) 复合阳离子交换膜 (CEM)，并将其评估为电渗析 (ED) 海水淡化的有希望的候选者。在 SPK 基质中加入多功能化（SO3H 和 COOH）IGO 导致高性能 CEM，具有改进的电化学和物理化学性质（电导率、渗透选择性、含水量和离子交换容量）、稳定性（热、机械和化学）对于多样化的电膜工艺。由于多功能氧化基团的存在，IGO 和 SPK 之间的强氢键导致合适的疏水-亲水结构和负责离子传导通道的离子簇的形成。优化良好的 SPK/IGO-8 复合 CEM 表现出良好的吸水率 (32.56%)、离子交换容量 (2.16 meq·g−1)、高渗透选择性 (0.87) 和电导率 (5.40 × 10−2 S cm−1)由于磺酸基团的摩尔浓度高。SPK/IGO-8 复合 CEM 的相对较高的极限电流密度 (Ilim) 值为在电渗析器上施加高电流密度提供了一个广阔的窗口，以实现快速脱盐，而不会产生任何不需要的水分解。此外，反离子和膜基质之间的低摩擦系数以及 SPK/IGO-8 复合 CEM 的良好电渗析性能揭示了其用于海水淡化的潜在候选者。SPK/IGO-8 复合 CEM 的相对较高的极限电流密度 (Ilim) 值为在电渗析器上施加高电流密度提供了一个广阔的窗口，以实现快速脱盐，而不会产生任何不需要的水分解。此外，反离子和膜基质之间的低摩擦系数以及 SPK/IGO-8 复合 CEM 的良好电渗析性能揭示了其用于海水淡化的潜在候选者。SPK/IGO-8 复合 CEM 的相对较高的极限电流密度 (Ilim) 值为在电渗析器上施加高电流密度提供了一个广阔的窗口，以实现快速脱盐，而不会产生任何不需要的水分解。此外，反离子和膜基质之间的低摩擦系数以及 SPK/IGO-8 复合 CEM 的良好电渗析性能揭示了其用于海水淡化的潜在候选者。