Effect of Hydrothermal Carbonization Parameters and Performance of Carbon Dioxide Adsorption on Pineapple Peel Waste Biochar

Abstract

Abstract Low‐cost biochar adsorbents were prepared from pineapple peel waste (PPW) via hydrothermal carbonization (HTC) for CO 2 capture. The effects of hydrothermal carbonization temperature, retention time, and heating rate were studied. The hydrochar samples were further carbonized to produce pineapple peel biochar adsorbents. The effects of CO 2 concentration in the feed, adsorption temperature, and feed flow rate on adsorption capacity were investigated in a fixed‐bed column adsorption system. The experimental data were analyzed using pseudo‐first‐order and pseudo‐second‐order kinetics, and the Avrami equation. The CO 2 adsorption capacity of this system was improved with increasing CO 2 feed concentration and decreased with rising temperature and feed flow rate. The Avrami kinetics model was best fitted to the experimental data. The CO 2 adsorption performance of PPW biochar (PPW‐BC) in a fixed‐bed column was successfully predicted by the Thomas and Yoon‐Nelson models. The prepared PPW‐BC adsorbents could be a viable option for CO 2 capture because they were synthesized from a low‐cost biomass source and are environmentally benign.