Abstract Laminated graphene oxide (GO) membrane is promising in desalination owing to allowing unimpeded water permeation through the tunable interlayer nanochannels. To achieve highly efficient and stable desalination performance of GO membrane is crucial. Herein, GO membranes intercalated and cross-linked by poly(vinyl alcohol) (PVA) and supported on cellulose microfiltration membrane were fabricated via pressure-assisted filtration method for application in pervaporation desalination of high-salinity water. The interlayer spacing and microstructure of the GO membranes is successfully tailored by searching for appropriate intercalated PVA amount for cross-linking. The nanochannel microstructure was probed and its effect on the mass transport property of the membranes was revealed. The results show that the permeability of the GO-PVA membranes was dependent on both d-spacing and 3D cross-linking network between GO nanosheets. The optimized GO-PVA membranes displayed an outstanding water flux of over 98 kg/m2h and 99.99% salt rejection in desalinating 10 wt% NaCl solution at 85 °C. Benefiting from the formation of brick-mortar structure of GO layers with high adhesion strength provided by the cross-linked PVA chains with GO nanosheets, the membranes could toughly resist sonication destruction test and exhibited stable and reliable performance in pervaporation. The study helps understanding and optimizing the constitution of inner structure of intercalated GO membrane for efficient separation.

中文翻译：

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定制聚乙烯醇插层氧化石墨烯膜的微观结构，通过渗透蒸发提高高盐度水的脱盐性能

摘要 层压氧化石墨烯 (GO) 膜由于允许水无阻碍地渗透通过可调层间纳米通道，因此在海水淡化方面很有前景。实现GO膜高效稳定的脱盐性能至关重要。在此，通过压力辅助过滤方法制造了由聚乙烯醇（PVA）插入和交联并负载在纤维素微滤膜上的 GO 膜，用于高盐度水的渗透蒸发脱盐。通过寻找合适的 PVA 插入量进行交联，成功地调整了 GO 膜的层间距和微观结构。对纳米通道微结构进行了探测，并揭示了其对膜传质性能的影响。结果表明，GO-PVA 膜的渗透性取决于 GO 纳米片之间的 d 间距和 3D 交联网络。优化后的 GO-PVA 膜在 85 °C 下对 10 wt% NaCl 溶液进行脱盐时显示出超过 98 kg/m2h 的出色水通量和 99.99% 的脱盐率。得益于GO纳米片交联的PVA链提供的具有高粘合强度的GO层砖砂结构的形成，该膜可以坚韧地抵抗超声破坏试验，并在渗透蒸发中表现出稳定可靠的性能。该研究有助于理解和优化插入式GO膜的内部结构构成，以实现高效分离。优化后的 GO-PVA 膜在 85 °C 下对 10 wt% NaCl 溶液进行脱盐时显示出超过 98 kg/m2h 的出色水通量和 99.99% 的脱盐率。得益于GO纳米片交联的PVA链提供的具有高粘合强度的GO层砖砂结构的形成，该膜可以坚韧地抵抗超声破坏试验，并在渗透蒸发中表现出稳定可靠的性能。该研究有助于理解和优化插入式GO膜的内部结构构成，以实现高效分离。优化后的 GO-PVA 膜在 85 °C 下对 10 wt% NaCl 溶液进行脱盐时显示出超过 98 kg/m2h 的出色水通量和 99.99% 的脱盐率。得益于GO纳米片交联的PVA链提供的具有高粘合强度的GO层砖砂结构的形成，该膜可以坚韧地抵抗超声破坏试验，并在渗透蒸发中表现出稳定可靠的性能。该研究有助于理解和优化插入式GO膜的内部结构构成，以实现高效分离。该膜具有较强的抗超声破坏试验能力，渗透汽化性能稳定可靠。该研究有助于理解和优化插入式GO膜的内部结构构成，以实现高效分离。该膜具有较强的抗超声破坏试验能力，渗透汽化性能稳定可靠。该研究有助于理解和优化插入式GO膜的内部结构构成，以实现高效分离。