Journal
POLYMERS
Volume 14, Issue 23, Pages -Publisher
MDPI
DOI: 10.3390/polym14235240
Keywords
chitosan; pyrolysis; biochar; freeze-drying; chitosan-films; CO2-adsorption
Categories
Funding
- Ministerio de Ciencia e Innovacion (Spain) [TED2021-130756B-C31]
- Junta de Andalucia [P20_00375, UMA18-FEDERJA-126]
- FEDER funds
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This study used different morphologies of chitosan to synthesize biochars and found that the biochar synthesized from chitosan formed by the freeze-dried method showed the highest CO2-adsorption capacity and higher resistance to pyrolytic treatment. CO2-adsorption capacity decreases with increasing temperature, indicating a physical process of adsorption.
Three chitosans with different morphologies have been used (commercial chitosan powder, chitosan in film form and chitosan in globular form synthesized by the freeze-dried method) for the synthesis of biochars. The pyrolytic treatment has revealed that the biochar synthesized from the chitosan formed by the freeze-dried method reaches the highest CO2-adsorption capacity (4.11 mmol/g at 0 degrees C and a pressure of 1 bar) due to this adsorbent is highly microporous. Moreover, this biochar is more resistant to the pyrolytic treatment in comparison to the biochars obtained from the commercial chitosan and chitosan in the form of film. CO2-adsorption studies at different temperatures have also shown that the adsorption capacity diminishes as the adsorption temperature increases, thus suggesting that the adsorption takes place by a physical process.
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