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Research Article

Adsorption properties of V(IV) on the resin-activated carbon composite electrodes in capacitive deionization

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  • Received: 6 April 2020Revised: 13 May 2020Accepted: 15 May 2020Available online: 17 May 2020
  • The composite electrodes prepared by cation exchange resins and activated carbon (AC) were used to adsorb V(IV) in capacitive deionization (CDI). The electrode made of middle resin size (D860/AC M) has the largest specific surface area and mesoporous content than other two composite electrodes. Electrochemical analysis showed that D860/AC M presents higher specific capacitance and electrical double layer capacitor, and significantly lower internal diffusion impedance, thus it exhibits the highest adsorption capacity and rate for V(IV) among three electrodes. The intra-particle diffusion model fits well the initial adsorption stage, while the liquid film diffusion model is more suitable for the fitting at the later stage. The pseudo-second-order kinetic model is fit for the entire adsorption process. The adsorption of V(IV) on the composite electrode follows the Freundlich isotherm, and thermodynamic analysis indicates that this is an exothermic process with entropy reduction and the electric field force plays a dominant role in the CDI process. This work is conducive to peep at the ions adsorption behaviors and mechanisms on the composite electrodes in CDI.
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Adsorption properties of V(IV) on the resin-activated carbon composite electrodes in capacitive deionization

  • Corresponding author:

    Shen-xu Bao    E-mail: sxbao@whut.edu.cn

  • 1. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
  • 2. Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Wuhan 430070, China
  • 3. Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan University of Science and Technology, Wuhan 430081, China

Abstract: The composite electrodes prepared by cation exchange resins and activated carbon (AC) were used to adsorb V(IV) in capacitive deionization (CDI). The electrode made of middle resin size (D860/AC M) has the largest specific surface area and mesoporous content than other two composite electrodes. Electrochemical analysis showed that D860/AC M presents higher specific capacitance and electrical double layer capacitor, and significantly lower internal diffusion impedance, thus it exhibits the highest adsorption capacity and rate for V(IV) among three electrodes. The intra-particle diffusion model fits well the initial adsorption stage, while the liquid film diffusion model is more suitable for the fitting at the later stage. The pseudo-second-order kinetic model is fit for the entire adsorption process. The adsorption of V(IV) on the composite electrode follows the Freundlich isotherm, and thermodynamic analysis indicates that this is an exothermic process with entropy reduction and the electric field force plays a dominant role in the CDI process. This work is conducive to peep at the ions adsorption behaviors and mechanisms on the composite electrodes in CDI.

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