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Amine-modified waste tires for CO2 capture and resource utilization.

Napatjira Jaree1, Dusadee Tumnantong1, Jirapong Luangchaiyaporn2

  • 1Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.

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|August 12, 2025
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Summary

Waste tires were modified with tetraethylenepentamine (TEPA) to create an effective carbon dioxide (CO2) adsorbent. This material demonstrated high reusability and potential for converting captured CO2 into valuable chemicals.

Keywords:
Amine modification, Electrochemical CO2 reduction reactionCO2 adsorption-desorptionWaste tire

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Chemical Engineering

Background:

  • Waste tires (WTs) pose a significant environmental challenge due to their large accumulation.
  • Developing efficient methods for carbon dioxide (CO2) capture is crucial for mitigating climate change.

Purpose of the Study:

  • To functionalize waste tires into an effective adsorbent material for CO2 capture.
  • To investigate the performance of amine-modified waste tire materials for selective CO2 adsorption.
  • To explore the potential for converting captured CO2 into value-added products.

Main Methods:

  • Waste tire powder was modified with tetraethylenepentamine (TEPA) at various loading levels (2.5-15%).
  • CO2 adsorption capacity and selectivity were evaluated under ambient conditions.
  • Kinetic studies were performed using Avrami's model to understand adsorption mechanisms.
  • Reusability was tested over multiple adsorption-desorption cycles at 60°C under vacuum.
  • Electrochemical conversion of adsorbed CO2 to chemicals was investigated.

Main Results:

  • 10% TEPA-modified waste tire material (WT10T) exhibited optimal CO2 adsorption performance.
  • Adsorption kinetics followed Avrami's model, indicating both physisorption and chemisorption.
  • WT10T demonstrated excellent reusability over 10 cycles with minimal performance loss.
  • Captured CO2 could be electrochemically converted into valuable products like methane and hydrogen.

Conclusions:

  • Amine-modified waste tires offer a sustainable and cost-effective solution for CO2 capture.
  • The developed adsorbent material shows promise for industrial applications in carbon capture and utilization.
  • This approach provides a dual benefit of waste material valorization and greenhouse gas reduction.