SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2024, Vol. 71 ›› Issue (7): 45-57.DOI: 10.1016/j.cjche.2024.04.011

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Waste acid recovery utilizing monovalent cation permselective membranes through selective electrodialysis

Yanran Zhu1, Yue Zhou1, Qian Chen1, Rongqiang Fu2, Zhaoming Liu2, Liang Ge1, Tongwen Xu1   

  1. 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
  • Received:2023-12-01 Revised:2024-04-24 Online:2024-08-30 Published:2024-07-28
  • Contact: Liang Ge,E-mail:geliang@ustc.edu.cn;Tongwen Xu,E-mail:twxu@ustc.edu.cn
  • Supported by:
    This research was 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) and Major Science and Technology Innovation Projects in Shandong Province (2022CXGC020415).

Waste acid recovery utilizing monovalent cation permselective membranes through selective electrodialysis

Yanran Zhu1, Yue Zhou1, Qian Chen1, Rongqiang Fu2, Zhaoming Liu2, Liang Ge1, Tongwen Xu1   

  1. 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
  • 通讯作者: Liang Ge,E-mail:geliang@ustc.edu.cn;Tongwen Xu,E-mail:twxu@ustc.edu.cn
  • 基金资助:
    This research was 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) and Major Science and Technology Innovation Projects in Shandong Province (2022CXGC020415).

Abstract: 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/FeCl2 system, when a current density of 20 mA·cm-2 and a volume ratio of 1:2 are applied. Similarly, in the H2SO4/FeSO4 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.

Key words: Selective electrodialysis, Wastewater, Monovalent cation permselective membranes, Separation, Recovery

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/FeCl2 system, when a current density of 20 mA·cm-2 and a volume ratio of 1:2 are applied. Similarly, in the H2SO4/FeSO4 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