Two-dimensional MXene membranes with biomimetic sub-nanochannels for enhanced cation sieving.

ABSTRACT: Membranes with high ion permeability and selectivity are of considerable interest for sustainable water treatment, resource extraction and energy storage. Herein, inspired by K⁺ channel of streptomyces A (KcsA K⁺), we have constructed cation sieving membranes using MXene nanosheets and Ethylenediaminetetraacetic acid (EDTA) molecules as building blocks. Numerous negatively charged oxygen atoms of EDTA molecules and 6.0 Å two-dimensional (2D) sub-nanochannel of MXene nanosheets enable biomimetic channel size, chemical groups and tunable charge density for the resulting membranes. The membranes show the capability to recognize monovalent/divalent cations, achieving excellent K⁺/Mg²⁺ selectivity of 121.2 using mixed salt solution as the feed, which

SUBMITTER: Xu R 

PROVIDER: S-EPMC10427654 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature