Research on CO2 Adsorption Properties of PEI-Functionalized ZIF-8 Synthesized by Zinc Acetate-Assisted Mechanochemical Method
To develop high-efficiency CO2 adsorbents suitable for large-scale production,high specific surface area ZIF-8 samples were synthesized through an efficient mechanochemical method.Zinc acetate was utilized as an auxiliary abrasive,with ZnO serving as the metal precursor.The synthesis conditions and advantages of the mechanochemical method were investigated.Furthermore,polyethyleneimine(PEI)was impregnated into the ZIF-8 samples via a wet impregnation technique.The synthesized samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier-transform infrared spectroscopy(FT-IR),and nitrogen adsorption/desorption measurement.Their CO2 adsorption performance was also evaluated.The results showed that the mechanochemical method efficiently synthesized ZIF-8 materials in a short time with a high yield of 80.7%.This method significantly reduced the quantities of organic solvents and ligands required,and produced ZIF-8 with smaller particle sizes.The performance of ZIF-8 in CO2 adsorption was significantly improved with the incorporation of PEI,where the adsorbent loaded with 60%(mass fraction)PEI demonstrated the highest adsorption capacity,reaching 90.21 mg/g at 50℃.This represented an approximately 14-fold enhancement over the capacity of ZIF-8 alone.Additionally,the composite material demonstrated good stability and regeneration performance,suggesting its potential for widespread application in CO2 adsorption.
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