以蔗渣为原料,以ZnCl2为活化剂制备出活性炭AC,并用KOH对活性炭AC进行二次活化制备活性炭KAC.用热重法测定材料的CO2吸附脱附性能,傅里叶红外光谱、氮气物理吸附-脱附和扫描电镜对样品进行表征.结果表明:KAC具有优异的CO2吸附性能,在60℃下其对CO2吸附量可达3.45 mmol/g,而AC的CO2吸附量仅有1.79 mmol/g.KAC的CO2吸附能力明显优于AC.循环吸附脱附的结果表明,经过5次吸附-脱附,材料的吸附量无显著变化,表明材料具有良好的再生性能.傅里叶红外分析结果表明两种活性炭材料的特征峰基本一致,活性炭表面官能团中羟基和羧基可以使活性炭表面的极性增大.氮气物理吸附-脱附和扫描电镜结果表明材料都具有发达的孔径结构,但KAC的孔径结构比AC更发达,因此其对CO2的吸附能力也更强.
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