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<p>Plastics have become an inevitable part of our daily life and have been used in various household and industrial sectors, which leads to plastic waste accumulation that has been considered a serious threat to the environment, affecting the ecosystem and humankind. In recent years, researchers have focused on valorizing plastic waste into functional carbon materials due to their enriched functional properties and structural stability. Further, the capacitive deionization (CDI) has emerged as an efficient electrosorptive technology that remediates inorganic contaminants present in the wastewater. In view of this, the present research investigates the transformation of mixed plastic waste into N-doped char using urea as a nitrogen dopant for the development of a functional electrode. The developed functional electrode performance has been investigated in a semibatch cuboidal configured CDI unit of volume 1.7&#xa0;L and the optimal conditions have been predicted using central composite design (CCD). The resulting crosslinked N-doped mixed plastic char-chitosan functional electrode (NMPC-CS) exhibits a mesopore distribution with specific capacitances of 725&#xa0;F/g for 1&#xa0;M sodium sulphate electrolyte, and for 25 ppm Cr(VI) solution, it attains 182&#xa0;F/g. The optimal voltage, flow rate and feed Cr(VI) concentration were determined as 2.5&#xa0;V, 50 mL/min and 100 ppm, respectively, using CCD. The electrosorption capacity and the removal efficiency of NMPC-CS for Cr(VI) removal were obtained as 49.46&#xa0;mg/g and 90.42% respectively at the optimal conditions. The plastic-derived functional electrode effectively mitigates Cr(VI) ions in batch with recirculation CDI, which proves the potential for eco-economic scale-up in the near future.</p> Graphical abstract <p></p>

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Valorizing mixed plastic waste into N-doped electrosorptive electrodes: a resilient chromium mitigation technology

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Vigneshhwaran Ganesan,
  • Meera Sheriffa Begum Kadhar Mohamed

摘要

Plastics have become an inevitable part of our daily life and have been used in various household and industrial sectors, which leads to plastic waste accumulation that has been considered a serious threat to the environment, affecting the ecosystem and humankind. In recent years, researchers have focused on valorizing plastic waste into functional carbon materials due to their enriched functional properties and structural stability. Further, the capacitive deionization (CDI) has emerged as an efficient electrosorptive technology that remediates inorganic contaminants present in the wastewater. In view of this, the present research investigates the transformation of mixed plastic waste into N-doped char using urea as a nitrogen dopant for the development of a functional electrode. The developed functional electrode performance has been investigated in a semibatch cuboidal configured CDI unit of volume 1.7 L and the optimal conditions have been predicted using central composite design (CCD). The resulting crosslinked N-doped mixed plastic char-chitosan functional electrode (NMPC-CS) exhibits a mesopore distribution with specific capacitances of 725 F/g for 1 M sodium sulphate electrolyte, and for 25 ppm Cr(VI) solution, it attains 182 F/g. The optimal voltage, flow rate and feed Cr(VI) concentration were determined as 2.5 V, 50 mL/min and 100 ppm, respectively, using CCD. The electrosorption capacity and the removal efficiency of NMPC-CS for Cr(VI) removal were obtained as 49.46 mg/g and 90.42% respectively at the optimal conditions. The plastic-derived functional electrode effectively mitigates Cr(VI) ions in batch with recirculation CDI, which proves the potential for eco-economic scale-up in the near future.

Graphical abstract