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<p>Climate change mitigation requires efficient and low-cost approaches for carbon dioxide (CO<sub>2</sub>) capture, and valorization of fruit waste offers a sustainable pathway to address this challenge. This study establishes a systematic modeling framework for interpreting CO<sub>2</sub> adsorption on activated hydrochars derived from banana and orange peels synthesized via hydrothermal carbonization. Multiple kinetic and isotherm models were evaluated using both the coefficient of determination (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{R}^{2}\)</EquationSource> </InlineEquation>) and the Akaike Information Criterion (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:AIC\)</EquationSource> </InlineEquation>) to ensure robust comparison. Kinetic analyses revealed that the pseudo-second-order model (<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\:{R}^{2}\)</EquationSource> </InlineEquation> = 0.997, lowest <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\:AIC\)</EquationSource> </InlineEquation>) and Elovich model best describe the uptake behavior, indicating chemisorption on heterogeneous surfaces. Equilibrium data were most consistent with the Tóth and Sips models (<InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\:{R}^{2}\)</EquationSource> </InlineEquation> &gt; 0.99), supporting monolayer adsorption coupled with micropore filling. By combining statistical rigor with mechanistic interpretation, this work advances understanding of the adsorption mechanisms of fruit waste-derived hydrochars and highlights their promise as scalable and sustainable sorbents for CO<sub>2</sub> capture.</p>

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CO2 uptake on fruit wastes-derived activated hydrochars: systematic modeling of adsorption kinetics and isotherms

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月5日

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  • Sooraj Mohan,
  • K. Ashwini,
  • P. Dinesha

摘要

Climate change mitigation requires efficient and low-cost approaches for carbon dioxide (CO2) capture, and valorization of fruit waste offers a sustainable pathway to address this challenge. This study establishes a systematic modeling framework for interpreting CO2 adsorption on activated hydrochars derived from banana and orange peels synthesized via hydrothermal carbonization. Multiple kinetic and isotherm models were evaluated using both the coefficient of determination ( \(\:{R}^{2}\) ) and the Akaike Information Criterion ( \(\:AIC\) ) to ensure robust comparison. Kinetic analyses revealed that the pseudo-second-order model ( \(\:{R}^{2}\) = 0.997, lowest \(\:AIC\) ) and Elovich model best describe the uptake behavior, indicating chemisorption on heterogeneous surfaces. Equilibrium data were most consistent with the Tóth and Sips models ( \(\:{R}^{2}\) > 0.99), supporting monolayer adsorption coupled with micropore filling. By combining statistical rigor with mechanistic interpretation, this work advances understanding of the adsorption mechanisms of fruit waste-derived hydrochars and highlights their promise as scalable and sustainable sorbents for CO2 capture.