CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China.
Anal Chem. 2020 Oct 20;92(20):13630-13633. doi: 10.1021/acs.analchem.0c02446. Epub 2020 Sep 1.
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.
手性材料通常是手性膜分离的关键。在这项工作中，我们提出了一种新的策略，通过机械搅拌诱导涡旋结构，可将非手性多孔石墨烯膜转化为手性多孔石墨烯膜。通过新设计的一步法直接从石墨而不是氧化石墨烯合成了具有可控纳米孔的多孔石墨烯。然后通过搅拌过滤将多孔石墨烯固定在超滤膜上，形成多孔石墨烯膜，用于对 DL-氨基酸进行对映选择性分离：例如，l-/d-苯丙氨酸的分离因子达到 4.76。有趣的是，我们首次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。
