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The capture of CO2 by two kinds of adsorbent, mesoporous silica including SBA-15, MCM-41, and pre-expanded MCM-41 grafted with mono-, di-, and tri-aminosilanes, and activated carbon fiber cloth (ACFC) is studied.Temperature swing adsorption (TSA) and electric swing adsorption (ESA) are used to regenerate mesoporous silica and ACFC, respectively, after adsorption of CO2 from a gas stream containing 10% to 30% of CO2 in nitrogen.