Graphene oxide (GO)-based pervaporation membranes have great potential for desalination and lithium containing brine enrichment. However, they experienced critical challenges when used in aqueous solution and exposed to oscillating temperatures due to swelling and microdefects. In this work, the GO-based membranes were fabricated by the filtration of GO suspension with sulfonate-containing diamine molecules on porous substrates, then dip-coated with chitosan and polyvinyl alcohol (PVA). The resultant GO-based membranes demonstrated 99.99% salt rejection during pervaporation using NaCl or lithium-containing concentrated inland brine with humic acid as the feed solution under oscillating temperature. The intercalation of diamine molecules inside the GO nanochannels was able to increase water flux by 20% while the coated chitosan/PVA layer reduced structural defects and undesired scaling/fouling on the membrane surface resulting in minimal reduction of water flux (16%) over 72 h of oscillating temperature pervaporation. Moreover, the membrane exhibited good stability after chemical cleaning. The proposed GO-based membranes provided significant performance sustainability in concentrated inland brine and oscillating feed temperature condition.

基于氧化石墨烯 (GO) 的渗透蒸发膜在海水淡化和含锂卤水富集方面具有巨大潜力。然而，由于膨胀和微缺陷，它们在水溶液中使用并暴露于振荡温度时遇到了严峻的挑战。在这项工作中，通过在多孔基材上用含磺酸盐的二胺分子过滤 GO 悬浮液，然后用壳聚糖和聚乙烯醇 (PVA) 浸涂来制备基于 GO 的膜。在振荡温度下，使用 NaCl 或含锂的浓缩内陆盐水以腐殖酸作为进料溶液，所得的基于 GO 的膜在渗透蒸发过程中表现出 99.99% 的盐截留率。二胺分子在 GO 纳米通道内的嵌入能够将水通量增加 20%，而涂覆的壳聚糖/PVA 层减少了膜表面的结构缺陷和不希望的结垢/污垢，导致水通量的最小降低（16%）超过 72 h 的振荡温度渗透蒸发。此外，该膜在化学清洗后表现出良好的稳定性。所提出的基于 GO 的膜在浓缩内陆盐水和振荡进料温度条件下提供了显着的性能可持续性。