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

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 & DEG;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 & DEG;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 & DEG;C and 4.35 mmol/g at 20 & DEG;C.

Automated summary

A new strategy for producing ultramicroporous activated carbons from avocado seeds was developed, which involved solvothermal carbonization and thermal KOH activation. The samples exhibited excellent CO2 sorption capacities, with the best adsorption achieved using isopropanol as the solvent. The highest CO2 adsorption was 6.47 mmol/g at 0°C and 4.35 mmol/g at 20°C.