Effect of Reaction Parameters on CO2 Absorption from Biogas Using CaO Sorbent Prepared from Waste Chicken Eggshell

Taslima Akter; Rahim Abdur; Mohammad Shahinuzzaman; Mohammad Shah Jamal; Mohammad Abdul Gafur; Swapan Kumer Roy; Shahin Aziz; Md Aftab Ali Shaikh; Mosharof Hossain

doi:10.1021/acsomega.3c06226

Effect of Reaction Parameters on CO₂ Absorption from Biogas Using CaO Sorbent Prepared from Waste Chicken Eggshell

ACS Omega. 2023 Nov 3;8(45):43000-43007. doi: 10.1021/acsomega.3c06226. eCollection 2023 Nov 14.

Authors

Taslima Akter¹, Rahim Abdur¹, Mohammad Shahinuzzaman¹, Mohammad Shah Jamal¹, Mohammad Abdul Gafur², Swapan Kumer Roy³, Shahin Aziz³, Md Aftab Ali Shaikh^{4

5}, Mosharof Hossain¹

Affiliations

¹ Institute of Fuel Research and Development, Bangladesh Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-E-Khuda Road, Dhanmandi, Dhaka 1205, Bangladesh.
² Pilot Plant and Process Development Center, Bangladesh Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-E-Khuda Road, Dhanmandi, Dhaka 1205, Bangladesh.
³ BCSIR Laboratories, Bangladesh Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-E-Khuda Road, Dhanmandi, Dhaka 1205, Bangladesh.
⁴ Bangladesh Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-E-Khuda Road, Dhanmandi, Dhaka 1205, Bangladesh.
⁵ Department of Chemistry, University of Dhaka, Dhaka 1000, Bangladesh.

Abstract

This study provides an efficient and straightforward approach to eliminate carbon dioxide (CO₂) by absorption using a calcium oxide (CaO) sorbent derived from chicken eggshells. The sorbent concentration, stirring speed, and contact time were varied. The optimal condition for CO₂ removal was a 10% calcium hydroxide (Ca(OH)₂) suspension at 600 rpm with 20 min interaction. This optimum condition conferred the ever-highest absorption (98.71%) of CO₂ through Ca(OH)₂ suspensions from eggshell-derived CaO. X-ray diffraction was used to identify crystallographic phases and optimum conditions revealed calcium carbonate (CaCO₃) formation with the highest intensity, Fourier transform infrared spectroscopy revealed peaks for the carbonate (CO₃^2-) group, field emission scanning electron microscopy was used to investigate the morphological and structural properties of the sorbent before and after CO₂ absorption, and thermogravimetric analysis was performed to understand the reaction mechanism. According to the kinetic analysis, the sorbent can be fully decomposed with a minimum activation energy (E_a) of 89.09 kJ/mol.