Green preparation of CaO-based CO2 adsorbent by calcium-induced hydrogenation of shell wastes at room/moderate temperature

Yang-Yang Hao; Ming-Xiu Xiao; Guo-Cui Mao; Jin-Peng Wang; Zhan-Kuo Guo; Bao-Xia Dong; Yun-Lei Teng

doi:10.1016/j.jenvman.2024.120782

Green preparation of CaO-based CO₂ adsorbent by calcium-induced hydrogenation of shell wastes at room/moderate temperature

J Environ Manage. 2024 Apr 25:359:120782. doi: 10.1016/j.jenvman.2024.120782. Online ahead of print.

Authors

Yang-Yang Hao¹, Ming-Xiu Xiao¹, Guo-Cui Mao¹, Jin-Peng Wang¹, Zhan-Kuo Guo¹, Bao-Xia Dong², Yun-Lei Teng³

Affiliations

¹ School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, PR China.
² School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, PR China. Electronic address: bxdong@yzu.edu.cn.
³ School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, PR China. Electronic address: ylteng@yzu.edu.cn.

PMID: 38669884
DOI: 10.1016/j.jenvman.2024.120782

Abstract

Capturing CO₂ using clamshell/eggshell-derived CaO adsorbent can not only reduce carbon emissions but also alleviate the impact of trash on the environment. However, organic acid was usually used, high-temperature calcination was often performed, and CO₂ was inevitably released during preparing CaO adsorbents from shell wastes. In this work, CaO-based CO₂ adsorbent was greenly prepared by calcium-induced hydrogenation of clamshell and eggshell wastes in one pot at room/moderate temperature. CO₂ adsorption experiments were performed in a thermogravimetric analyzer (TGA). The adsorption performance of the adsorbents obtained from the mechanochemical reaction (BM-C/E-CaO) was superior to that of the adsorbents obtained from the thermochemical reaction (Cal-C/E-CaO). The CO₂ adsorption capacity of BM-C-CaO at 650 °C is up to 36.82 wt%, but the adsorption decay rate of the sample after 20 carbonation/calcination cycles is only 30.17%. This study offers an alternative energy-saving method for greenly preparing CaO-based adsorbent from shell wastes.

Keywords: CO(2) capture; CaO; Clamshell; Eggshell.