화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.83, 136-144, March, 2020
DOI10.1016/j.jiec.2019.11.021  Export Citation
Carbon electrodes with ionic functional groups for enhanced capacitive deionization performance
Oneeb ul Haq, Da-Seul Choi, Jae-Hwan Choi1, †, and Youn-Sik Lee†
  • Division of Chemical Engineering, Jeonbuk National University, 567 Baekje-Daero, Deokjin-gu, Jeonju, Jeonbuk, 54896, Republic of Korea
  • 1Department of Chemical Engineering, Kongju National University, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan, Chungnam, 31080, Republic of Korea
E-mail:,
Capacitive deionization (CDI) has proved to be a clean and green technology; however, the charge leakage in the electrode pores during the adsorption-desorption cycles lowers the desalination efficiency. In this work, commercially available activated carbon was chemically treated to give the activated carbon surface either immobilized amino groups or sulfonic acid groups. The amino group-containing and sulfonic group-containing carbon materials were used as anode and cathode electrodes, respectively, in assembling a CDI (AC-CDI) cell. The salt adsorption capacity, salt removal efficiency, and charge efficiency of the AC-CDI cell were over two times higher than those of the untreated carbon-based CDI cell and comparable with those of the membrane CDI (MCDI) cell. The greatly improved desalination performance of the AC-CDI cell was attributed to enhanced wettability, faster diffusion of counter ions to each electrode via electrostatic attraction, and the prevention of re-adsorption of ions via repulsion between the charged layers and co-ions during adsorption-desorption cycle. Thus, it can be concluded that chemically modified carbon-based CDI cell is highly promising for practical application.
Keywords:Capacitive deionization;Ion exchange;Functionalized Activated carbon;Salt removal
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