Affiliation:
1. Key Laboratory of Precision and Intelligent Chemistry, Department of Applied Chemistry, School of Chemistry and Materials Science University of Science and Technology of China Hefei Anhui China
Abstract
AbstractThe recovery of acid/base from industrial wastewater via membrane technology is energy efficient and has a low carbon footprint, while demanding high‐performing ion exchange membranes. It remains a grand challenge for ion exchange membranes, enabling concomitantly fast H+/OH− transport and high ion selectivity. This article presents a negatively charged microporous polymer membrane, a sulfonated polyxanthene membrane, which has intrinsic micropore channels for H+/OH− permeation, and we find that highly selective H+ and OH− transport can be acquired with the same membrane. This membrane exhibits a high H+/Fe2+ selectivity of 617 (6.3 times that of the commercial CIMS membrane) in acid recovery and a very high OH−/WO42− selectivity of 649 (the highest value ever reported) in alkali recovery while maintaining comparable H+/OH− transport rate. The results highlight the importance of hydrophilic micropores as ion‐selective channels in constructing high‐performing ion exchange membranes for resource recovery.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China