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<p>The CO<sub>2</sub> adsorption characteristics of olive waste activated carbon (AC) treated with monoethanolamine (MEA) was investigated. The amine effect on the AC was characterized with SEM, FTIR, TGA and N<sub>2</sub> adsorption–desorption. The results revealed that the amine group effect of the adsorbent enhanced the CO<sub>2</sub> adsorption. The maximum amount of CO<sub>2</sub> adsorption obtained by AC and AC-MEA was 7.3 and 14.2&#xa0;mmol.g<sup>−1</sup> at 298&#xa0;K and 14&#xa0;bar. The experimental CO<sub>2</sub> adsorption were evaluated with the Langmuir model, which exhibits a near perfect fit, and this indicated the heterogeneous character of the adsorbent surfaces. The kinetic study and the isosteric heat of adsorption have assessed by the Clausius–Clapeyron equation which indicated the physisorption process. The response surface methodology (RSM) was used to assess the effects of process variables and their interaction on the response (CO<sub>2</sub> adsorption) to obtain the optimal conditions. From the ANOVA findings, increasing temperature has a negative impact on the adsorption capacity, namely at low temperature for both adsorbent samples, the adsorption capacity adsorption capacity is raised.</p>

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CO2 adsorption onto activated carbon through functionalization by monoethanolamine: experimental and RSM modeling

  • 期刊论文

  • 发表日期：

    2025年4月13日

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  • Hedi Jedli,
  • Souhail Mohammed Bouzgarrou,
  • Rym Hassani,
  • Ehab Sabi,
  • Khalifa Slimi

摘要

The CO2 adsorption characteristics of olive waste activated carbon (AC) treated with monoethanolamine (MEA) was investigated. The amine effect on the AC was characterized with SEM, FTIR, TGA and N2 adsorption–desorption. The results revealed that the amine group effect of the adsorbent enhanced the CO2 adsorption. The maximum amount of CO2 adsorption obtained by AC and AC-MEA was 7.3 and 14.2 mmol.g−1 at 298 K and 14 bar. The experimental CO2 adsorption were evaluated with the Langmuir model, which exhibits a near perfect fit, and this indicated the heterogeneous character of the adsorbent surfaces. The kinetic study and the isosteric heat of adsorption have assessed by the Clausius–Clapeyron equation which indicated the physisorption process. The response surface methodology (RSM) was used to assess the effects of process variables and their interaction on the response (CO2 adsorption) to obtain the optimal conditions. From the ANOVA findings, increasing temperature has a negative impact on the adsorption capacity, namely at low temperature for both adsorbent samples, the adsorption capacity adsorption capacity is raised.