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The coexistence of antibiotic and heavy metals in water poses a significant challenge for remediation. In this study, an asymmetric capacitive deionization (CDI) system was developed using nitric acid (HNO3) modified activated carbon fiber (ACF-HNO3) as the cathode and pristine ACF as the anode. The modified ACF electrode presented increased oxygen-containing functional groups, lower ion diffusion resistance, and higher charge transfer capability. The removal of tetracycline (TC) and heavy metal ion (Cu2+) in either coexisting system or single component system by CDI followed pseudo-first order kinetics, driven by a combination of electrosorption and electrochemical oxidation reactions. In comparison to TC-only and Cu2+-only removal, Cu2+ facilitated TC removal, whereas TC slightly inhibited Cu2+ removal under coexisting condition. After five regeneration cycles, the removal performance of modified ACF decreased by less than 20%, demonstrating excellent electrode recyclability and system stability. Overall, these findings highlight the substantial potential of the CDI system for treating wastewater co-contaminated with organic pollutants and heavy metals.

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Removal of Coexisting Tetracycline and Cu2+ from Water by a Modified ACF Electrochemical System

  • 会议论文

  • 发表日期：

    2026年

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  • Qiao Li,
  • Jian Lang,
  • Jiyuan Jin,
  • Nairui Yang,
  • Wenyou Wu,
  • Zhenyu Chen,
  • Sicheng Ding,
  • Jianbing Li,
  • Wenchuan Ding

摘要

The coexistence of antibiotic and heavy metals in water poses a significant challenge for remediation. In this study, an asymmetric capacitive deionization (CDI) system was developed using nitric acid (HNO3) modified activated carbon fiber (ACF-HNO3) as the cathode and pristine ACF as the anode. The modified ACF electrode presented increased oxygen-containing functional groups, lower ion diffusion resistance, and higher charge transfer capability. The removal of tetracycline (TC) and heavy metal ion (Cu2+) in either coexisting system or single component system by CDI followed pseudo-first order kinetics, driven by a combination of electrosorption and electrochemical oxidation reactions. In comparison to TC-only and Cu2+-only removal, Cu2+ facilitated TC removal, whereas TC slightly inhibited Cu2+ removal under coexisting condition. After five regeneration cycles, the removal performance of modified ACF decreased by less than 20%, demonstrating excellent electrode recyclability and system stability. Overall, these findings highlight the substantial potential of the CDI system for treating wastewater co-contaminated with organic pollutants and heavy metals.