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1、第32卷第1期无机材料学报Vol.32No.12017年1月JournalofInorganicMaterialsJan.,2017文章编号:1000-324X(2017)01-0018-07DOI:10.15541/jim20160293蔗渣活性炭二次活化制备及其吸附CO2性能研究魏建文,林志峰,何泽瑜,和凯凯,耿琳琳,廖雷(桂林理工大学广西矿冶与环境科学实验中心,桂林541004)摘要: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
2、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3.45mmol/g,而AC的CO2吸附量仅有1.79mmol/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。关键词:蔗渣;活性炭;二次活化;二氧化碳;吸附中
3、图分类号:TQ174文献标识码:ABagasseActivatedCarbonReactivationPromotesAdsorptionofCO2WEIJian-Wen,LINZhi-Feng,HEZe-Yu,HEKai-Kai,GENGLin-Lin,LIAOLei(GuangxiScientificExperimentCenterofMining,MetallurgyandEnvironment,GuilinUniversityofTechnology,Guilin541004,China)Abstract:Activatedcarbon(AC)wasprepar
4、edfrombagasseusingZnCl2astheactivator.Thenewtypeofacti-vatedcarbon(KAC)waspreparedfromACusingKOHasthesecondactivator.CO2adsorption/desorptionproper-tiesweredeterminedbythermalgravimetricanalysismethod(TGA).Theactivatedcarbonmaterialswerecharacter-izedbyFouriertransforminfraredspectroscop
5、e(FTIR),N2adsorption-desorptionandscanningelectronmicroscope(SEM).TheresultsshowedthatCO2adsorptionquantitiesofKACandACwere3.45mmol/gand1.79mmol/g,re-spectivelyat60℃.KAChasabetteradsorptioncapacitythanAC.TheCO2adsorptioncapacityafterfiveadsorp-tion/desorptioncyclesshowednoobviouschanges,
6、displaythematerialsgoodregenerationperformance.There-sultsofFTIRspectrashowedthatthecharacteristicpeaksofthetwoactivatedcarbonmaterialswerealmostthesame.Thepolarityoftheactivatedcarbonsurfaceincreasedwiththeincreaseofhydroxylandcarboxylgroupsonactivatedcarbons.N2adsorption-desorptionspec
7、traandSEMimagesdemonstratedthatallthetwokindsofmateri-alshadabundantpores,andKAChadmuchmoreporeswhichresultedinbetteradsorptioncapacity.Keywords:bagasse;activatedcarbon;reactivation;carbondioxide;adsorption收稿日期:2016-05-03;收到修改稿日期:2016-06-20基金项目:国家自然科学基金(51566003);广西自然科学基金