Department of Biotechnology and Nanomedicine, SINTEF Industry, 7034 Trondheim, Norway.
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA.
Science. 2022 Apr;376(6588):90-94. doi: 10.1126/science.abj9351. Epub 2022 Mar 31.
Advances in membrane technologies that combine greatly improved carbon dioxide (CO) separation efficacy with low costs, facile fabrication, feasible upscaling, and mechanical robustness are needed to help mitigate global climate change. We introduce a hybrid-integrated membrane strategy wherein a high-permeability thin film is chemically functionalized with a patchy CO-philic grafted chain surface layer. A high-solubility mechanism enriches the concentration of CO in the surface layer hydrated by water vapor naturally present in target gas streams, followed by fast CO transport through a highly permeable (but low-selectivity) polymer substrate. Analytical methods confirm the existence of an amine surface layer. Integrated multilayer membranes prepared in this way are not diffusion limited and retain much of their high CO permeability, and their CO selectivity is concurrently increased in some cases by more than ~150-fold.
需要开发兼具高二氧化碳（CO）分离效率、低成本、易于制造、可放大以及机械稳定性的膜技术，以帮助缓解全球气候变化。我们提出了一种混合集成膜策略，其中高渗透性的薄膜通过化学接枝方式在表面层上接枝具有 CO 亲和性的支链。高溶解度机制使富含水蒸气的目标气流中的 CO 在表面层中浓缩，随后通过高渗透性（但选择性低）的聚合物基底快速传输 CO。分析方法证实了胺表面层的存在。以这种方式制备的集成多层膜不受扩散限制，保持了较高的 CO 渗透性，在某些情况下，CO 选择性可提高 150 倍以上。
