Aqueous Two-Phase Interfacial Assembly of COF Membranes for Water Desalination

• DOI: 10.1007/s40820-022-00968-5
• Publication Date: 2022-11-09T20:02:52Z
• Authors: Hongjian Wang; Jiashuai Zhao; Yang Li; Yu Cao; Ziting Zhu; Meidi Wang; Runnan Zhang; Fusheng Pan; Zhongyi Jiang
• Keywords: Permeance

Aqueous two-phase system features with ultralow interfacial tension and thick region, affording unique confined space for membrane assembly. Here, the first time, an aqueous assembly method is proposed to fabricate covalent organic framework (COF) membranes. The solution containing polyethylene glycol dextran undergoes segregated phase separation into two water-rich phases. By respectively distributing aldehyde amine monomers phases, a series of COF membranes are fabricated at water-water interface. resultant exhibit high NaCl rejection 93.0-93.6% water permeance reaching 1.7-3.7 L m-2 h-1 bar-1, superior most desalination Interestingly, found have pronounced effect on structures. appropriate range (0.1-1.0 mN m-1) leads tight intact Furthermore, extended fabrication other metal-organic polymer This work exploitation fabricating in all-aqueous system, confering green generic advanced manufacturing.