Waste acid recovery utilizing monovalent cation permselective membranes through selective electrodialysis  

作　　者：Yanran Zhu Yue Zhou Qian Chen Rongqiang Fu Zhaoming Liu Liang Ge Tongwen Xu 

机构地区：[1]Anhui Provincial Engineering Laboratory of Functional Membrane Materials and Technology,Department of Applied Chemistry,School of Chemistry and Materials Science,University of Science and Technology of China,Hefei 230026,China [2]Key Laboratory of Charged Polymeric Membrane Materials of Shandong Province,Shandong Tianwei Membrane Technology Co.,Ltd.,Weifang 261000,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第7期45-57,共13页中国化学工程学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(2022YFB3805100);National Natural Science Foundation of China(22222812 and 22178330);Anhui Provincial Key Research and Development Plan(202104b11020030);Major Science and Technology Innovation Projects in Shandong Province(2022CXGC020415).

摘　　要：Selective electrodialysis(SED)has surfaced as a highly promising membrane separation technique in the realm of acid recovery owing to its ability to effectively separate monovalent ions through the utilization of a potential difference.However,the current SED process is limited by conventional commercial monovalent cation permselective membranes(MCPMs).This study systematically investigates the use of an independently developed MCPM in the SED process for acid recovery.Various factors such as current density,volume ratio,initial ion concentration,and waste acid systems are considered.The independently developed MCPM offers several advantages over the commercial monovalent selective cation-exchange membrane(CIMS),including higher recovered acid concentration,better ion flux ratio,improved acid recovery efficiency,increased recovered acid purity,and higher current efficiency.The SED process with the MCPM achieves a recovered acid of 95.9%and a concentration of 2.3 mol·L^(–1) in the HCl/FeCl_(2) system,when a current density of 20 mA·cm^(-2) and a volume ratio of 1:2 are applied.Similarly,in the H_(2)SO_(4)/FeSO_(4) system,a purity of over 99%and a concentration of 2.1 mol·L^(–1) can be achieved in the recovered acid.This study thoroughly examines the impact of operation conditions on acid recovery performance in the SED process.The independently developed MCPM demonstrates outstanding acid recovery performance,highlighting its potential for future commercial utilization.

关 键 词：Selective electrodialysis WASTEWATER Monovalent cation permselective membranes SEPARATION RECOVERY 

分 类 号：TQ028.8[化学工程] X703[环境科学与工程—环境工程]