Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria, 3800, Australia.
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, 230027, China.
Nat Commun. 2023 Apr 15;14(1):2161. doi: 10.1038/s41467-023-37932-9.
Engineering different two-dimensional materials into heterostructured membranes with unique physiochemical properties and molecular sieving channels offers an effective way to design membranes for fast and selective gas molecule transport. Here we develop a simple and versatile pyro-layering approach to fabricate heterostructured membranes from boron nitride nanosheets as the main scaffold and graphene nanosheets derived from a chitosan precursor as the filler. The rearrangement of the graphene nanosheets adjoining the boron nitride nanosheets during the pyro-layering treatment forms precise in-plane slit-like nanochannels and a plane-to-plane spacing of ~3.0 Å, thereby endowing specific gas transport pathways for selective hydrogen transport. The heterostructured membrane shows a high H permeability of 849 Barrer, with a H/CO selectivity of 290. This facile and scalable technique holds great promise for the fabrication of heterostructures as next-generation membranes for enhancing the efficiency of gas separation and purification processes.
将不同的二维材料工程化为具有独特物理化学性质和分子筛分通道的异质结构膜，为设计用于快速和选择性气体分子传输的膜提供了一种有效方法。在这里，我们开发了一种简单而通用的热压层层法，从氮化硼纳米片作为主要支架和由壳聚糖前体衍生的石墨烯纳米片作为填充剂来制造异质结构膜。在热压层层处理过程中，与氮化硼纳米片相邻的石墨烯纳米片的重排形成了精确的平面内狭缝状纳米通道和~3.0Å 的面-面间距，从而赋予了选择性氢气传输的特定气体传输途径。异质结构膜表现出高的 H 渗透率为 849 Barrer，H/CO 选择性为 290。这种简单且可扩展的技术为制造下一代用于提高气体分离和净化过程效率的异质结构膜提供了很大的前景。
