CO2 adsorption evaluation of different biochars produced from peanut shell pyrolysis

Abstract This study investigates the CO 2 adsorption performance of peanut shell biochars produced under varying thermochemical process conditions, including different atmospheres (N 2 and CO 2 ), temperatures (600, 700 and 800 °C), and heating rates (5 and 65 °C/min). The biochars were characterized for, textural properties (BET surface area and pore volume) and morphology (SEM). CO 2 adsorption capacity of the biochar samples produced under different experimental conditions was also measured using a thermogravimetric analyzer. Results indicate that increasing pyrolysis temperature generally enhances CO 2 adsorption capacity, with chars produced in a CO 2 atmosphere showing superior performance due to the Boudouard reaction. The highest CO 2 adsorption of 64 mgCO 2 /g char was achieved at 700 °C and a 65 °C/min heating rate under CO 2 atmosphere. The study confirms that pyrolysis conditions significantly influence the structural properties and adsorption capabilities of peanut-shell biochars, highlighting their potential as effective and sustainable adsorbents for CO 2 capture.