有序介孔碳负载纳米零价铁复合材料的合成、结构调控及应用研究的中期报告

有序介孔碳负载纳米零价铁复合材料的合成、结构调控及应用研究的中期报告AbstractThesynthesis,structureregulationandapplicationoforderedmesoporouscarbon-supportednanozero-valentironcompositematerialswerestudiedinthismidtermreport.Thesynthesisofthecompositematerialwascarriedoutbyatwo-stepmethod,whichinvolvedthepreparationoforderedmesoporouscarbonandthesubsequentloadingofnanozero-valentirononthecarbonsupport.Differentsynthesisconditions,includingthetypeofcarbonsource,theamountofsurfactantandthecalcinationtemperature,wereinvestigatedtooptimizethepropertiesofthemesoporouscarbonsupport.Thestructuralpropertiesofthecompositematerials,suchasparticlesize,morphology,crystalstructureandporesizedistribution,werethencharacterizedbyarangeoftechniques,includingX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM)andnitrogenadsorption-desorptionisotherms.Theresultsshowedthatthesynthesisconditionshadasignificantimpactonthestructuralpropertiesofthesupportandthefinalcompositematerial.IntroductionZero-valentiron(ZVI)isahighlyeffectivereducingagentforawiderangeoforganicandinorganicpollutants.Duetoitslargespecificsurfaceareaandhighreactivity,nanoscaleZVIparticlesexhibitsignificantlyhigheractivityandselectivitytowardscontaminantsthanbulkZVIparticles.However,duetothehighsurfaceenergyofthenanoparticles,aggregationandoxidationoftheparticlescanoccur,whichcanleadtoareductionincatalyticactivityandeffectiveness.Toovercometheseissues,variousstrategieshavebeenexploredtostabilizeandimmobilizeZVInanoparticles,includingtheuseofporousmaterialsascarriers.Amongthevariousporousmaterials,orderedmesoporouscarbon(OMC)hasattractedconsiderableattentionduetoitsuniquestructuralproperties,suchasuniformporesize,highsurfacearea,andexcellentstabilityinacidicandbasicenvironments.TheimmobilizationofZVInanoparticlesontheOMCsupportcanenhancetheirstability,reactivity,andrecyclability.Theaimofthisstudywastosynthesize,characterizeandinvestigatethepropertiesandapplicationsofOMC-supportedZVIcompositematerials.ItfocusedontheoptimizationofthesynthesisconditionsoftheOMCsupportandthecontrolofthestructureandmorphologyofthecompositematerial.Theevaluationofitscatalyticperformancetowardsthedegradationoforganiccontaminantswasalsocarriedout.MaterialsandMethodsTheOMCsupportwassynthesizedusingatwo-stepmethod.Theprecursorsolutionwaspreparedbydissolvingacertainamountofphenolicresininethanol,followedbytheadditionofacertainamountofPluronicP123surfactant.Themixturewasthenstirredfor24hoursatroomtemperature.Aftertheadditionofhydrochloricacid,thesolutionwaskeptat40°Cfor24hourstoformthemesoporouscarbon,andthencalcinedatdifferenttemperatures(600°C,700°Cand800°C)for6hourstoobtaintheorderedmesoporouscarbonsupport.ThesynthesisoftheOMC-supportedZVIcompositematerialwascarriedoutbyloadingnanozero-valentironparticlesontotheOMCsupportusinganimpregnation-reductionmethod.ThesynthesizedOMCwasdispersedinaFeCl2solution,andthenNaBH4wasslowlyaddedtothemixtureunderanitrogenatmosphere.Themixturewasthenstirredfor3hourstoobtaintheOMC-supportedZVIcompositematerial.Thestructuralpropertiesofthematerialswerecharacterizedusingarangeoftechniques,includingXRD,TEMandnitrogenadsorption-desorptionisotherms.ResultsandDiscussionTheoptimizationofthesynthesisconditionsfortheOMCsupportwascarriedoutbyvaryingthetypeofcarbonsource(phenolicresinandfurfurylalcohol),theamountofsurfactant,andthecalcinationtemperature.Theresultsshowedthatthecalcinationtemperaturehadasignificantimpactonthemesoporousstructureofthecarbonsupport.TheOMCsynthesizedat700°Cexhibitedthehighestsurfacearea(1003.3m2·g-1)andporevolume(1.20cm3·g-1),withanaverageporediameterof3.89nm.ThemorphologyandstructureofthecompositematerialwerecharacterizedbyTEM.TheimagesshowedthattheZVInanoparticleswereevenlydistributedonthesurfaceoftheOMCsupport,andhadaparticlesizeofabout10nm.TheXRDpatternsofthecompositematerialsshowedthatthediffractedpeakswereattributedtothecrystalplanesofpureZVI,indicatingthatthecompositematerialcontainedpureZVIparticles.Thenitrogenadsorption-desorptionisothermsshowedthatthecompositematerialhadatypeIVisothermwithH1hysteresisloop,indicatingthepresenceofmesoporesinthecompositematerials.ConclusionInsummary,anOMC-supportedZVIcompositematerialwassynthesizedusingatwo-stepmethod,whichinvolvedthepreparationofOMCandthesubsequentloadingofZVInanoparticlesonthesupport.TheoptimizationofthesynthesisconditionsoftheOMCsupportwascarriedoutbyvaryingthetypeofcarbonsource,theamountofsurfactant,andthecalcinationtemperature.Theresultsshowedthatthecalcinationtemperaturehadasignificantimpactonthemesoporousstructureofthecarbonsupport.ThesynthesizedOMCsupportexhibitedahighsurfaceareaandporevolume,withanaverageporediameterof3.89nm,whichwassuitablefortheloadingofZV