Energy-autonomous KCl extraction from brine via biomimetic covalent-organic-framework membranes and redox-driven ion transport.

ABSTRACT: Selective extraction of KCl from complex salt lake brines remains a challenging task due to the presence of competing ions and the high energy requirements of conventional separation methods. To overcome these limitations, we have developed a biomimetic separation system that integrates three-dimensional (3D) covalent organic framework (COF) membranes with redox-mediated energy harvesting. These COF membranes are designed with sub-nanometer cavity channels decorated with oxygen-containing groups, which enable fine-tuning of electrostatic potential. This design allows for the simultaneous separation of anions and cations through valence-dependent short-range interactions. By coupling the COF membranes with Ag/AgCl redox pairs, the system converts the salinity gradient across the membrane in

SUBMITTER: Guo Q 

PROVIDER: S-EPMC12749934 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature