Solid-solvent processing of ultrathin, highly loaded mixed-matrix membrane for gas separation

• 成果类型: Article
• 署名作者: Chen, Guining; Chen, Cailing; Guo, Yanan; Chu, Zhenyu; Pan, Yang; Liu, Guozhen; Liu, Gongping; Han, Yu; Jin, Wanqin; Xu, Nanping
• 署名单位: Nanjing Tech University; King Abdullah University of Science & Technology; Suzhou Laboratory
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9441
• DOI: 10.1126/science.adi1545
• 发表日期: 2023-09-22
• 页码: 1350-1356
• 关键词: molecular-sieve membrane; mof membranes; hydrogen; polymer; DESIGN; layer

摘要

Mixed-matrix membranes (MMMs) that combine processable polymer with more permeable and selective filler have potential for molecular separation, but it remains difficult to control their interfacial compatibility and achieve ultrathin selective layers during processing, particularly at high filler loading. We present a solid-solvent processing strategy to fabricate an ultrathin MMM (thickness less than 100 nanometers) with filler loading up to 80 volume %. We used polymer as a solid solvent to dissolve metal salts to form an ultrathin precursor layer, which immobilizes the metal salt and regulates its conversion to a metal-organic framework (MOF) and provides adhesion to the MOF in the matrix. The resultant membrane exhibits fast gas-sieving properties, with hydrogen permeance and/or hydrogen-carbon dioxide selectivity one to two orders of magnitude higher than that of state-of-the-art membranes.