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Solving two environmental problems simultaneously：Microporous carbon derived from mixed plastic waste for CO2

Xiaoli Zhou1, Liyao Zhu2, Weiliang Dong3

  • 1Key Laboratory for Waste Plastics Biocatalytic Degradation and Recycling, Nanjing Tech University, Nanjing, 211816, PR China; College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, PR China.

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Summary

This study converts mixed plastic waste into porous carbon for carbon dioxide (CO2) capture. The resulting material shows high CO2 uptake and adsorption rates, offering a dual solution for plastic pollution and carbon emissions.

Keywords:
Autogenic pressure carbonizationCO(2) adsorptionKOH activationPlastic wastePorous carbon

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Plastic waste and carbon emissions are significant global challenges.
  • Previous research focused on single plastic types (e.g., PET) for CO2 capture materials.
  • Utilizing mixed plastic waste (MPW) for functional materials is crucial for practical applications.

Purpose of the Study:

  • To develop porous carbon materials from MPW for efficient CO2 capture.
  • To investigate the impact of activation methods on material properties.
  • To evaluate the CO2 adsorption performance of the synthesized porous carbons.

Main Methods:

  • Mixed plastic waste (MPW) was processed using cascading autogenic pressure carbonization (APC).
  • Chemical activation with potassium hydroxide (KOH) was employed to create porous structures.
  • CO2 adsorption capacity, kinetics, selectivity, and cyclic stability were measured.

Main Results:

  • A carbon yield of 56% was achieved from MPW via APC.
  • Optimal porous carbon was obtained at a KOH/C ratio of 4, exhibiting a large micropore area.
  • The material demonstrated a maximum CO2 adsorption of 2.7 mmol g⁻¹ at 298 K and 1 bar, with fast kinetics and good N2 selectivity.

Conclusions:

  • Porous carbon derived from MPW is a viable adsorbent for CO2 capture.
  • The developed material offers high CO2 uptake, rapid adsorption, and excellent cyclic stability.
  • This approach provides a sustainable pathway for managing plastic waste and mitigating carbon emissions.