Abstract Graphene oxide (GO) has been widely used for the fabrication of nanofiltration membranes because precise molecular sieving can be achieved through the narrow interlayer spacing between stacked GO sheets. Herein, the scalable and continuous fabrication of a GO membrane is demonstrated by using a slot-die coater at a coating speed of 6 mm s−1. The thickness of the GO membrane can be controlled in 100-nm scale depending on the concentration of the GO solution and substrate morphology. Moreover, the coating layer and d-spacing (6.5–7.5 A) of the GO membrane is preserved, even in aqueous solution, as GO is partially reduced by NaOH treatment (so-called deoxygenated GO, dGO). A membrane performance test reveals that the dGO membrane is effective for filtering sub-nanometer-size dye molecules with a rejection rate of up to 99% (brilliant blue G) and a pure water permeance of 30 LMH bar−1. The dGO membrane operates stably under cross-flow and high pressure up to 12 bar. Scale-up of the GO membrane fabrication using the slot-die coating technique is feasible because the coating process is continuous.

中文翻译：

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通过连续缝模涂布可扩展制备脱氧氧化石墨烯纳滤膜

摘要 氧化石墨烯 (GO) 已广泛用于制造纳滤膜，因为通过堆叠 GO 片材之间的狭窄层间距可以实现精确的分子筛分。在此，通过使用狭缝式涂布机以 6 mm s-1 的涂布速度证明了 GO 膜的可扩展和连续制造。GO 膜的厚度可以控制在 100 nm 范围内，具体取决于 GO 溶液的浓度和基板形态。此外，即使在水溶液中，GO 膜的涂层和 d 间距（6.5-7.5 A）也得以保留，因为 GO 被 NaOH 处理部分还原（所谓的脱氧 GO，dGO）。膜性能测试表明，dGO 膜可有效过滤亚纳米级染料分子，截留率高达 99%（亮蓝色 G），纯水渗透率为 30 LMH bar−1。dGO 膜在错流和高达 12 bar 的高压下稳定运行。使用槽模涂布技术放大 GO 膜的制造是可行的，因为涂布过程是连续的。