Chiral materials are usually the key to the separation of chiral membranes. In this work, we propose a new strategy that chiral porous graphene membrane can be fabricated from nonchiral porous graphene by mechanical stirring to induce vortex structure. Porous graphene with controlled, nanosized pores was synthesized by a newly designed, one-pot process directly from graphite as opposed to graphene oxide. Then porous graphene was immobilized on ultrafiltration membrane through filtering while stirring to form porous graphene membrane, which was applied for enantioselective separation toward DL-amino acids: for example, the separation factor of l-/d-phenylalanine reached 4.76. Interestingly, we first observed that the front and back sides of the porous graphene membrane exhibited opposite optical activities.

中文翻译：

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涡旋多孔石墨烯手性膜的对映选择性分离。

手性材料通常是分离手性膜的关键。在这项工作中，我们提出了一种新的策略，可以通过机械搅拌从非手性多孔石墨烯制备手性多孔石墨烯膜以诱导涡旋结构。通过新设计的一锅法直接从石墨（而不是氧化石墨烯）合成了具有受控纳米孔的多孔石墨烯。然后在搅拌的同时通过过滤将多孔石墨烯固定在超滤膜上以形成多孔石墨烯膜，将其用于对DL-氨基酸的对映选择性分离：例如，l- / d的分离因子-苯丙氨酸达到4.76。有趣的是，我们首先观察到多孔石墨烯膜的正面和背面表现出相反的光学活性。