CO2 adsorption study on ZIF-8

https://doi.org/10.62239/jca.2024.086

Abstract

This article presents the results for synthesis of ZIF-8 and its CO₂ adsorption ability. The material was characterized by XRD, TEM, BET,… ZIF-8 was a porous structure and high BET surface area. ZIF-8 showed great potential for the capture of carbon dioxide, having a capacity of 11,176 mmol/g and the data of CO₂ adsorption on ZIF-8 were well fitted to the Langmuir isotherm. The principle mechanism of CO₂ adsorption on ZIF-8, simultaneous proton transfer and nucleophilic attack of nitrogen on the CO₂ molecules created an ammonium carbamate; after that, the bond for zinc ion with ammonium carbamate was formed. Morever, the interaction of ammonium with carbamate of neighboring ammonium carbamate species also increase CO₂ adsorption capacity.