文档名:钢渣花生壳复合活性炭制备及其甲醛脱除行为
摘要:为探索钢渣高附加值利用新途径,采用微波加热-磷酸活化法复合制备了钢渣-花生壳复合活性炭(SPAC),考察其室温条件下低质量浓度甲醛(HCHO)脱除行为,并对最佳样品的表面化学性质和微观结构进行了描述和分析.结果表明:当微波功率为550W、浸渍比为1.25:1.00、钢渣超微粉掺量(质量分数)为15%时,所制备的钢渣-花生壳复合活性炭对甲醛气体脱除率最高,即93.2%.钢渣-花生壳复合活性炭的脱除率与甲醛初始质量浓度呈负相关、而与脱除量呈正相关,其脱除动力学行为更加符合准二级动力学模型,化学因素是控制脱除反应速率的重要因素;脱除平衡特征更加符合Freundlich模型,属于优惠脱除,化学键力起到重要作用.钢渣-花生壳复合活性炭一方面具有优良的多孔结构及较大比表面积,对低质量浓度甲醛起到聚集作用;另一方面含有的铁元素(Fe2+、Fe3+价态)与锰元素(Mn2+价态)协同作用,实现对甲醛进一步吸附富集的同时,发生催化氧化脱除甲醛.该研究不仅为钢渣基功能材料的探索研究提供参考,而且为室温低浓度甲醛高效脱除提供理论支撑.
Abstract:IntroductionAsabulksolidwasteinironandsteelindustry,steelslagoccupiesalargeamountofland,andcausesenvironmentalpollution,havingagreatburdentoironandsteelindustryandsociety.Itisthusofgreattheoreticalandpracticalsignificancetoexploreeffectivewaysofsteelslagrecyclingandutilization.Formaldehyde(HCHO)asacolorless,irritatingsmelloftoxicgasisoneofcommonvolatileorganiccompounds(VOCs)inindoorair,whichcancausechronicrespiratorydiseases,leukemia,andbronchialasthmaanddamagetothenervoussystem.Activatedcarbon(AC)isextensivelyusedasanadsorbentforremovalofHCHO.ACisanextraordinaryadsorbent,butitsadsorptionefficiencyforHCHOislow.ThemodificationofACusingmetaloxides(suchasV2O5,MnO2,CuO,Fe2O3,etc.)canimprovetheservicelifeofACanditsformaldehydeadsorptionperformance.However,thepreparationcostwillincreaseduetothehighpriceofmetaloxides.Steelslagisrichinoxidesofcalcium,silicon,magnesium,iron,manganese,phosphorusandotherelements.Therefore,thecompositepreparationofecologicalACbysteelslagandbiomasswastematerialssolvestheproblemsofhighmodificationcost,shortservicelifeandpoorabsorptivity,andexpandsawayofhighvalue-addedutilizationofsteelslag.MethodsSteelslag/peanutshellactivatedcarbon(SPAC)wasfirstlypreparedviamicrowaveheatingandphosphoricacidactivation.Accordingtothenationalstandardof"Formaldehydeemissionlimitinwood-basedpanelsandtheirProductsofInteriorDecorationMaterials"(GB18580-2017),aformaldehydeabsorptivityexperimentbySPACwassystematicallymade.TheporosityofsampleswasdeterminedbyamodelASAP2020Msurfacearea&porosityanalyzerbasedontheN2adsorption-desorptionisotherm.ThemicroscopicmorphologyofSPACwasanalyzedbyamodelNANOSEM430scanningelectronmicroscopewithenergydispersespectroscope(SEM-EDS).TheelementscontentofSPACinultra-highvacuumwithAlKαlaserradiation(hυ=1486.6eV)wascharacterizedbyamodelESCALAB250X-rayphotoelectronspectrometer(XPS).ResultsanddiscussionTheresultshowthatthesamplehasanexcellentremovalefficiency(i.e.,93.2%)underthepreparationconditionof550Wmicrowavepower,1.25impregnationratioand15%steelslagcontent.Thecorrelationcoefficientsoftheexperimentalresultsandthefittedvaluesforthepseudo-second-orderkineticmodelandtheFreundlichmodelare0.9980and0.9537,respectively.ItisindicatedthattheremovalprocessofformaldehydeonSPACismoredominantduetochemisorption.TheN2adsorption-desorptionisothermisatypeIVadsorptionisothermwithH3andH4hysteresisloops,indicatingthatthesampleisamesoporousmaterial.BasedontheresultsofSEM-EDSandXPS,steelslagisloadedintotheSPACsampleandelementsFeandMnhaveacrucialrolefortheabsorptivityofformaldehyde.Thisstudyprovidedareferencefortheexplorationofsteelslagbasedfunctionalmaterials,andatheoreticalsupportfortheefficientformaldehyderemovalatroomtemperature.ConclusionsSteelslagpowdercouldbeloadedintothecompositeactivatedcarbon.Thepreparedcompositeactivatedcarbonstillretainedtheporousstructurecharacteristicssuitableforremovalofformaldehyde.ThesynergisticactionoftheelementsFeandMnfromsteelslagpowderwasbeneficialtoimprovingtheformaldehyderemoval.
作者:杜晓燕 王倩 韩伟胜 于先坤 张浩 Author:DUXiaoyan WANGQian HANWeisheng YUXiankun ZHANGHao
作者单位:安徽工业大学建筑工程学院,安徽马鞍山243032;冶金减排与资源综合利用教育部重点实验室(安徽工业大学),安徽马鞍山243002安徽工业大学建筑工程学院,安徽马鞍山243032中钢集团马鞍山矿山研究院股份有限公司,安徽马鞍山243000安徽工业大学建筑工程学院,安徽马鞍山243032;冶金减排与资源综合利用教育部重点实验室(安徽工业大学),安徽马鞍山243002;安徽工业大学冶金工程学院,安徽马鞍山243032
刊名:硅酸盐学报 ISTICEIPKU
Journal:JournaloftheChineseCeramicSociety
年,卷(期):2024, 52(7)
分类号:X753
关键词:钢渣 花生壳 活性炭 甲醛 脱除
Keywords:steelslag peanutshell activatedcarbon formaldehyde removal
机标分类号:TQ424.1X703O644
在线出版日期:2024年7月24日
基金项目:国家自然科学基金,安徽省重点研究与开发计划项目,安徽省博士后研究人员科研活动经费资助项目,冶金工程与资源综合利用安徽省重点实验室(安徽工业大学)开放基金项目,马鞍山市博士后研究人员科研活动经费资助项目钢渣-花生壳复合活性炭制备及其甲醛脱除行为[
期刊论文] 硅酸盐学报--2024, 52(7)杜晓燕 王倩 韩伟胜 于先坤 张浩为探索钢渣高附加值利用新途径,采用微波加热-磷酸活化法复合制备了钢渣-花生壳复合活性炭(SPAC),考察其室温条件下低质量浓度甲醛(HCHO)脱除行为,并对最佳样品的表面化学性质和微观结构进行了描述和分析.结果表明:当微...参考文献和引证文献
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