Abstract By utilizing the synergistic effect of polyelectrolyte (PEL) and sulfonated graphene oxide (SGO), novel composite membranes were prepared to achieve ultrafast transport of water molecules in isopropanol pervaporation dehydration. As confirmed by FTIR, Raman, XPS and XRD measurements, the sulfonation modification resulted in defects and uneven interlayer structure within SGO membrane (SGOM), which could enlarge the free volume for low-resistance water channels. The microstructure changes of composite membranes were observed via FESEM. The measured pervaporation behavior of pure components indicates that the transport capacity of SGOMs has been enhanced compared with graphene oxide membranes. After coated with an ultrathin PEL layer, the synergistic effect of highly enhanced water adsorption from the PEL layer and ultrafast permeation channels from SGOM facilitates the rapid and selective transport of water molecules through the membrane, which ensures excellent isopropanol dehydration performances. Both the flux and separation selectivity increase with temperature. At 70 °C, the flux can reach up to 3.67 kg m−2 h−1 with 99.90 wt% water content in permeate. The prepared membrane also possesses enhanced mechanical strength with firm interfacial adhesion. All the results evidence that SGO-based membranes possess outstanding advantages in isopropanol dehydration.

中文翻译：

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具有增强的异丙醇渗透蒸发脱水水传输能力的磺化氧化石墨烯基膜

摘要 利用聚电解质（PEL）和磺化氧化石墨烯（SGO）的协同作用，制备了新型复合膜以实现异丙醇渗透蒸发脱水中水分子的超快传输。FTIR、拉曼、XPS 和 XRD 测量证实，磺化改性导致 SGO 膜（SGOM）内的缺陷和不均匀的层间结构，这可能会扩大低电阻水通道的自由体积。通过FESEM观察复合膜的微观结构变化。纯组分的渗透蒸发行为表明，与氧化石墨烯膜相比，SGOM 的传输能力得到了增强。涂上超薄 PEL 层后，来自 PEL 层的高度增强的水吸附和来自 SGOM 的超快渗透通道的协同效应促进了水分子通过膜的快速和选择性传输，从而确保了出色的异丙醇脱水性能。通量和分离选择性都随温度增加。在 70 °C 时，通量可以达到 3.67 kg m-2 h-1，渗透物中的水含量为 99.90 wt%。制备的膜还具有增强的机械强度和牢固的界面附着力。所有结果都证明基于 SGO 的膜在异丙醇脱水方面具有突出的优势。通量和分离选择性都随温度增加。在 70 °C 时，通量可以达到 3.67 kg m-2 h-1，渗透物中的水含量为 99.90 wt%。制备的膜还具有增强的机械强度和牢固的界面附着力。所有结果都证明基于 SGO 的膜在异丙醇脱水方面具有突出的优势。通量和分离选择性都随温度增加。在 70 °C 时，通量可以达到 3.67 kg m-2 h-1，渗透物中的水含量为 99.90 wt%。制备的膜还具有增强的机械强度和牢固的界面附着力。所有结果都证明基于 SGO 的膜在异丙醇脱水方面具有突出的优势。