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Related Concept Videos

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Updated: Jul 23, 2025

Author Spotlight: Standardizing the Development of Amine-Based Silica Composites as CO2 Adsorbents for Direct Air Capture
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CO2 capture by microporous carbon based on Brazil nut shells.

Luiz K C de Souza1, Flaviana C P Ribeiro2, Rayanne O Araujo2

  • 1Department of Chemistry, Federal University of Amazonas, Manaus, Amazonas, Brazil. ls@ufam.edu.br.

Environmental Science and Pollution Research International
|July 14, 2023
PubMed
Summary

Researchers developed activated carbon from Brazil nut waste for carbon dioxide (CO2) capture. This sustainable material shows high CO2 adsorption capacity, offering a promising alternative for reducing greenhouse gas emissions.

Keywords:
BiomassCO2 captureCarbon materialsChemical activationMicroporesPhysical activation

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Rising carbon dioxide (CO2) emissions from human activities intensify the greenhouse effect and drive climate change.
  • Urgent need for effective CO2 capture technologies to mitigate climate change.
  • Porous carbon materials from lignocellulosic waste offer a sustainable and cost-effective solution for CO2 capture.

Purpose of the Study:

  • To synthesize activated carbon from Brazil nut biomass residues for CO2 capture.
  • To investigate the efficacy of physical and chemical activation methods in producing porous carbon.
  • To evaluate the CO2 adsorption performance of the synthesized materials.

Main Methods:

  • Synthesis of activated carbon from Brazil nut lignocellulosic residue using physical and chemical activation.
  • Characterization of porous structure using N2 adsorption-desorption isotherms.
  • Measurement of CO2 adsorption capacity at different temperatures and pressures.

Main Results:

  • Both physical and chemical activation yielded microporous carbon structures.
  • Chemical activation resulted in higher surface areas (1421–2730 m²/g) compared to physical activation (912 m²/g).
  • The chemically activated sample (BS6-K1) demonstrated superior CO2 adsorption (3.8 and 6 mmol/g at 25°C and 0°C, respectively), attributed to a high volume of ultramicropores.

Conclusions:

  • Activated carbon synthesized from Brazil nut residues is a viable precursor for CO2 capture materials.
  • The developed material offers a sustainable and efficient alternative for CO2 mitigation technologies.
  • The high CO2 adsorption capacity is linked to the material's specific microporous structure.