Two-dimensional (2D) materials membranes have gained widespread attention for their unique structure and outstanding separation performance. Herein, we developed a 2D vermiculite nanofiltration (TiO@VMT) membrane using TiO nanoparticles as versatile intercalator. The interlayer spacing of vermiculite nanosheets was tuned from 1.352 ± 0.002 nm to 1.424 ± 0.004 nm. As a result, the optimized TiO@VMT membrane exhibited high water flux of 261 L m h, which was 14 times higher than that of vermiculite membrane, simultaneously showed excellent rejections (>98 %) for various organic dyes (molecular weight >374 g mol). Due to the photocatalytic degradation ability of TiO nanoparticles towards organic foulants, the TiO@VMT membrane possessed excellent anti-fouling performance, with a flux recovery rate exceeding 90 % under UV radiation after three cycles of filtration experiment using oil-in-water emulsion and BSA solution as model foulants. Accordingly, our work may offer a possible route for the development of 2D nanofiltration membrane for efficient water purification.

中文翻译：

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采用 TiO2 纳米颗粒作为多功能嵌入剂的二维蛭石纳滤膜，用于增强水净化

二维（2D）材料膜因其独特的结构和优异的分离性能而受到广泛关注。在此，我们使用 TiO2 纳米粒子作为多功能嵌入剂开发了一种二维蛭石纳滤 (TiO@VMT) 膜。蛭石纳米片的层间距从1.352±0.002 nm调整到1.424±0.004 nm。结果，优化后的TiO@VMT膜表现出261 L m h的高水通量，比蛭石膜高14倍，同时对各种有机染料（分子量> 374 g mol）表现出优异的截留率（> 98 %） ）。由于TiO纳米颗粒对有机污染物的光催化降解能力，TiO@VMT膜具有优异的防污性能，经过3个循环的水包油乳液过滤实验，在紫外辐射下通量恢复率超过90% BSA 溶液作为模型污染物。因此，我们的工作可能为开发用于高效水净化的二维纳滤膜提供可能的途径。