Synthesis and CO2 adsorption properties of amino-functionalized bimetallic ZIF
Zeolitic imidazolate framework materials(ZIFs)have demonstrated considerable promise in the field of CO2 adsorption and separation as a highly porous class of materials characterized by their high specific surface area,porosity and stable pore structure.In order to improve the CO2 adsorption capabilities of ZIFs,a dual ap-proach involving pre-synthetic and post-synthetic functionalization was implemented.A one-pot synthesis meth-od at ambient temperature was utilized to produce hollow bimetallic zeolitic imidazolate framework materials(Co/Zn-ZIF).Following this,tetraethylenepentamine(TEPA)was employed as a post-synthetic functionaliza-tion modifier through impregnation to synthesize TEPA@Co/Zn-ZIF,which was utilized for CO2 adsorption and circular experimentation.Comparative analysis of TEPA@Co/Zn-ZIF with ZIF-8 and Co/Zn-ZIF was car-ried out using XRD,FT-IR,SEM,and other analytical techniques.The results of the adsorption experiments indicated that the modified material displayed a significantly increased CO2 adsorption capacity of 2.53 mmol/g,representing a 60％improvement over ZIF-8 and a 33％improvement over Co/Zn-ZIF.This enhancement can be attributed to the improved electrostatic interaction between the active metal centers and CO2 following metal do-ping,as well as the chemisorption resulting from the acid-base reaction of-NH2 with CO2.Additionally,TEPA@Co/Zn-ZIF maintained a satisfactory adsorption effect of 1.99 mmol/g even after undergoing five cycles.
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