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Capacitive deionization technology and its application in heavy metal separation and recovery |
REN Yan-na, NIE Lu-jie, WANG Lei, WANG Xu-dong |
Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Membrane Separation of Shaanxi Province, Research Institute of Membrane Separation Technology of Shaanxi Province, School of Environmental &Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China |
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Abstract Capacitive deionization (CDI), as a promising water treatment technology, is of great significance for the resource recovery of heavy metal wastewater. This paper describes the characteristics of conventional capacitive deionization (CDI), membrane capacitive deionization (MCDI), flow-through capacitive deionization (FT-CDI), inverted capacitive deionization (I-CDI), flow-electrode capacitive deionization (FCDI), and hybrid capacitive deionization (HCDI) systems, and analyzes the factors affecting the performance of heavy metal ion removal. The conclusions indicate that the removal performance of heavy metal ions is closely related to the equipment configurations, electrode materials, solution properties and operating conditions. Finally, combined with the recent application achievements of CDI technology in the separation of heavy metal ions, the future development direction of CDI technology was prospected, in order to provide reference for the research and application of CDI technology in the field of heavy metal wastewater treatment.
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Received: 15 March 2023
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