CO<sub>2</sub> adsorption study on ZIF-8

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.