KOH活化木质素制备高比表面积活性炭特性研究_英文_.docx

DOI10.11715/rskxjs.R201308009PreparationandCharacterizationofActivatedCarbonsBasedAlkaliLigninbyKOHChemicalActivationXiaoGang，Wu Rongbing，ZhouHuilong，NiMingjiang，GaoXiang，Cen Kefa(State Key LaboratoryofCleanEnergy Utilization，ZhejiangUniversity，Hangzhou 310027，China)2Abstract：Activatedcarbon(AC)withhighspecificsurface areawas preparedfromalkaliligninby chemicalactivation withKOHanditscharacteristicswereinvestigated.Theactivationprocesseswereconductedatvarioustemperatures(T， 600—900 ℃)，KOH/ligninmass ratios(R，1∶1—4∶1)，activationtimes(t，1—3 h).Bothscanningelectronmicros-copy(SEM)andnitrogenadsorptionisothermasBrunauer-Emmett-Teller(BET)wereusedtoidentifythestructuralcharac-teristicsofthetestedAC，andFouriertransforminfraredspectroscopy(FT-IR)methodwasappliedtoanalyzesurfacefunc-tionalgroups.Underexperimentalconditions，theoptimumconditionforpreparinghighspecificsurfaceACof2684 m/gwasR＝3∶1，T＝750 ℃，t＝1 h.TheresultsshowedthatRwasthecriticalfactorinfluencingtheBETspecificsurfaceareacomparedwithT andt.Pore distributionof thepreparedAC mainlyconcentratedon microporesand mesopores.Chemicalgroups such as —OHand—C＝O werecharacterized by FT-IR.Keywords：lignin；activatedcarbon；chemicalactivation；KOHKOH活化木质素制备高比表面积活性炭特性研究肖刚，吴荣兵，周慧龙，倪明江，高翔，岑可法(浙江大学能源清洁利用国家重点实验室，杭州 310027)摘 要：以木质素为制备原料，采用KOH 为活化剂制备高比表面积活性炭．通过探究不同活化温度、活化剂与木质素质量比、活化时间对活性炭孔隙结构的影响，优化木质素活性炭的制备工艺．采用 BET、SEM、FTIR等手段 对活性炭性能进行表征．实验结果表明，最佳制备工况为KOH/木质素质量比为 3∶1，活化时间 1 h，活化温度为 750 ℃．其中，KOH/木质素质量比对焦炭孔隙结构影响最大，活化温度次之，活化时间影响最小．制备的活性炭比m/g表面积最高可达2 684 2 ，孔径分布以中微孔居多，表面含有—OH、—C＝O 等基团．关键词：木质素；活性炭；化学活化；KOH中图分类号：TK6 文献标志码：A 文章编号：1006-8740(2014)01-0014-07Activatedcarbon(AC)iswidelyusedduetoitsad-sorptivecapacitywithahighspecificsurfaceareaandfunctionalgroups，suchasadsorbentfor removalofpollutions[1-2]，catalystsupport incatalysis[3-4]andgasstorage[5]. Theworld demandfor ACwasabout4.28millionmetrictonnesin2012anditisexpectedtoin-creaseby morethan10%per yearover thenextfiveyea