Proton-Blocking Anion-Exchange Membranes for Efficient Lithium Hydroxide Recovery by Bipolar Membrane Electrodialysis.

ABSTRACT: In bipolar membrane electrodialysis (BPED), proton transport through the anion-exchange membrane (AEM) is a major factor that reduces overall process efficiency. In this study, we propose a composite AEM incorporating a proton-blocking layer that combines strongly basic and weakly basic functional groups on top of a strongly basic AEM, providing proton-blocking capability while minimizing degradation of membrane conductivity. The proton-blocking layer is prepared by reacting brominated poly(phenylene oxide) (BPPO) with diamines having different alkyl chain lengths, namely N,N,N',N'-tetramethyl-1,6-hexanediamine (TMHDA), N,N,N',N'-tetramethyl-1,3-propanediamine (TMPDA), and N,N,N',N'-tetramethylethylenediami

SUBMITTER: Lee JH 

PROVIDER: S-EPMC12843717 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature