Enhancement of CO2 adsorption on activated carbons produced from avocado seeds by combined solvothermal carbonization and thermal KOH activation

Joanna Siemak; Beata Michalkiewicz

doi:10.1007/s11356-023-28638-y

Enhancement of CO₂ adsorption on activated carbons produced from avocado seeds by combined solvothermal carbonization and thermal KOH activation

Environ Sci Pollut Res Int. 2023 Jul 13. doi: 10.1007/s11356-023-28638-y. Online ahead of print.

Authors

Joanna Siemak¹, Beata Michalkiewicz²

Affiliations

¹ Faculty of Chemical Technology and Engineering, Department of Catalytic and Sorbent Materials Engineering, West Pomeranian University of Technology in Szczecin, Piastów Ave. 42, 71-065, Szczecin, Poland.
² Faculty of Chemical Technology and Engineering, Department of Catalytic and Sorbent Materials Engineering, West Pomeranian University of Technology in Szczecin, Piastów Ave. 42, 71-065, Szczecin, Poland. beata.michalkiewicz@zut.edu.pl.

PMID: 37442926
DOI: 10.1007/s11356-023-28638-y

Abstract

A new strategy for ultramicroporous activated carbons production from avocado seeds was developed. Combined solvothermal carbonization and thermal KOH activation were conducted. Solvothermal carbonizations were performed in a stainless-steel autoclave lined with Teflon at the temperature of 180 °C for 12 h in three different liquids (water, methanol, isopropyl alcohol). Chars were activated by KOH. The carbonization combined with activation took place in the oven at 850 °C for 1 h. All the samples were very good CO₂ sorbents. The highest CO₂ adsorption at a pressure of 1 bar was achieved for activated carbon produced using isopropanol. The best carbon dioxide adsorption was equal to 6.47 mmol/g at 0 °C and 4.35 mmol/g at 20 °C.

Keywords: Avocado seeds; CO2 adsorption; Carbon capture; Selectivity; Solvothermal carbonization; Ultramicroporous activated carbons.