Graphene oxide (GO) composite membranes were fabricated on polyacrylonitrile (PAN) substrates via inserting copper hydroxide nanostrands (CHNs) between GO sheets and coupling with an ultrathin hydrophilic sodium alginate (SA) top-layer. The prepared membranes were characterized by using FESEM, FTIR, XRD, water contact angle and nanoscratch measurements. The intercalation of CHNs could enlarge ultrafast water permeation channels in base GO membrane without destroying its interlayered structure. Hydrogen bonding and electrostatic interaction ensured SA layer could firmly adhere onto base GO membrane, which should be conducive to swelling prevention and selective moisture enrichment. The dehydration performance was investigated as a function of SA deposit, CHNs intercalation, and feed temperature. Under optimal SA deposit, the permeation flux could be improved by 30 wt% after the intercalation of CHNs between GO sheets. The permeation flux through the prepared membrane could reach up to 3.65 kg mh with an excellent separation selectivity (99.70 wt% water content in permeate) at 70 °C for 10 wt% water–ethanol solution. The permeation flux and separation selectivity both increased with elevated temperatures, revealing the complete anti-trade-off behavior. The prepared membrane also possessed enhanced mechanical strength and firm interfacial adhesion, which ensured its integrity in practical operating conditions.

中文翻译：

---

优化具有聚电解质保护层的纳米链插入氧化石墨烯膜以增强乙醇渗透汽化脱水


通过在 GO 片之间插入氢氧化铜纳米链 (CHN) 并与超薄亲水性海藻酸钠 (SA) 顶层偶联，在聚丙烯腈 (PAN) 基材上制备氧化石墨烯 (GO) 复合膜。通过FESEM、FTIR、XRD、水接触角和纳米划痕测量对制备的膜进行表征。 CHNs的嵌入可以扩大GO基底膜中的超快水渗透通道，而不破坏其层间结构。氢键和静电相互作用确保SA层能够牢固地粘附在GO基膜上，这应该有利于防止膨胀和选择性富集。研究了脱水性能与 SA 沉积、CHN 插层和进料温度的关系。在最佳的 SA 沉积下，在 GO 片之间插入 CHN 后，渗透通量可提高 30 wt%。对于 10 wt% 的水-乙醇溶液，在 70 °C 下，通过所制备的膜的渗透通量可达 3.65 kg mh，具有优异的分离选择性（渗透液中水含量为 99.70 wt%）。渗透通量和分离选择性均随温度升高而增加，揭示了完全的反权衡行为。制备的膜还具有增强的机械强度和牢固的界面粘附力，确保了其在实际操作条件下的完整性。