Preparation of amine-functionalized fumed SiO2 materials and their performance for CO2 adsorption
A series of fumed silica materials with different polyethyleneimine(PEI)loadings as CO2 adsorbents were pre-pared by using the equal-volume impregnation method.The composition,structure,actual loading amount of PEI,and ther-mal stability of the adsorbents were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),ther-mogravimetric analysis(TGA),Fourier-transform infrared spectroscopy(FT-IR),and nitrogen physical adsorption measure-ments.The effects of PEI relative molecular weight,loading amount,and environmental temperature on the CO2 adsorption performance of the adsorbents were investigated.It was found that the 50%-PEI(600)-SiO2 adsorbent exhibited the best CO2 adsorption performance at 100℃,with a maximum adsorption capacity of 130.6 mg/g when the relative molecular weight of PEI was 600 and the loading amount was 50%(mass fraction).Furthermore,the adsorbent showed excellent cyclic performance,with only 4.8%performance loss after 5 cycles.The adsorbent was cost-effective and held great potential for application in CO2 capture from thermal runaway flue gases of lithium-ion batteries.
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