Abstract In this study, we report a facile and straightforward graphene oxide pre-coating method to prepare defect-free, ultrathin film composite ceramic hollow fiber membranes. By coating a graphene oxide (GO) interlayer, the defect-free thin alumina active layer with sub-micrometer thicknesses was successfully coated on highly porous substrates without thick interlayers. The GO interlayer not only prevents the pore-clogging of the substrate by boehmite nanoparticles but also helps the thin and uniform formation of active layers. Since the ultrathin GO interlayer was naturally removed during the calcination process of the active layer over 400 °C, the ceramic thin-film composite (TFC) membranes with controllable active layer thickness and pore size were obtained. Prepared ceramic TFC membranes showed outstanding separation performance, which was 2–8 times higher water flux at the same MWCO, compared to commercial multilayered ceramic ultrafiltration membranes. The results demonstrate the superior separation properties of ceramic TFC membranes, and the potential of cost-effective GO interlayer pre-coating methods for fabricating inorganic based membranes for various molecular separation applications.

中文翻译：

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用于高渗透陶瓷薄膜复合膜的牺牲氧化石墨烯夹层

摘要 在这项研究中，我们报告了一种简便易行的氧化石墨烯预涂层方法来制备无缺陷的超薄膜复合陶瓷中空纤维膜。通过涂覆氧化石墨烯 (GO) 夹层，亚微米厚度的无缺陷薄氧化铝活性层成功涂覆在没有厚夹层的高度多孔基材上。GO 夹层不仅可以防止勃姆石纳米粒子对基材的孔隙堵塞，而且还有助于形成薄而均匀的活性层。由于活性层在400°C以上的煅烧过程中超薄GO中间层被自然去除，因此获得了活性层厚度和孔径可控的陶瓷薄膜复合（TFC）膜。制备的陶瓷 TFC 膜表现出优异的分离性能，与商用多层陶瓷超滤膜相比，相同 MWCO 下的水通量高 2-8 倍。结果证明了陶瓷 TFC 膜的优异分离性能，以及具有成本效益的 GO 夹层预涂层方法用于制造用于各种分子分离应用的无机膜的潜力。