過渡金屬氧化物納米材料的制備及其在分析檢測和水處理中的應用的中期報告AbstractInthismidtermreport,wesummarizeourprogressinpreparingtransitionmetaloxidenanomaterialsandtheirapplicationsinanalyticalandwatertreatmentpurposes.WesynthesizedvarioustransitionmetaloxidesincludingFe2O3,Co3O4,andNiOusingsol-gelandhydrothermalmethods.CharacterizationsusingTEM,SEM,XRD,andBETrevealedthatthesynthesizednanomaterialswerehighlycrystallineanduniforminsize.Thesenanoparticlesexhibitedexcellentcatalyticandadsorptionpropertiesfortheremovalofpollutantssuchasdyeandheavymetalsfromwater.Additionally,wealsoexploredthepotentialuseofthesynthesizedmaterialsingassensingandphotocatalysis.Overall,thepreparationoftransitionmetaloxidenanomaterialsandtheirapplicationpotentialhavebeendemonstrated.IntroductionNanomaterialshaveemergedasanewclassofmaterialswithdistinctpropertiescomparedtotheirbulkcounterpartsduetotheirhighsurfaceareaandquantumsizeeffects.Transitionsmetaloxideshavereceivedmuchattentioninthefieldofnanomaterialsbecauseoftheiruniqueredoxpropertiesandtheabilitytocreateoxygenvacanciesthatmakethemparticularlysuitableforvariousapplicationssuchasincatalysis,energystorage,gassensing,andenvironmentalremediation[1,2,3,4].Inthisresearchproject,wehavefocusedonthesynthesisoftransitionmetaloxidenanomaterialsincludingFe2O3,Co3O4,andNiO,andtheirpotentialapplicationsinanalyticalandwatertreatmentpurposes.ExperimentalSynthesisofFe2O3nanoparticlesFe2O3nanoparticlesweresynthesizedbythesol-gelmethod.Briefly,Fe(NO3)3?9H2O(1.8g)wasdissolvedindistilledwater(100mL),andethanol(40mL)wasadded.ThissolutionwasslowlydrippedintoasolutionofNH4OH(10mL,25%)underconstantstirring,andthereactionmixturewasagedat80°Cfor12hours.Theobtainedprecipitatewascollectedbycentrifugation,washedseveraltimeswithdistilledwaterandethanol,anddriedat80°C.SynthesisofCo3O4andNiOnanoparticlesCo3O4andNiOnanoparticlesweresynthesizedbyahydrothermalmethod.Inbrief,Co(NO3)2?6H2O(1.8g)andNi(NO3)2?6H2O(1.8g)wereseparatelydissolvedindistilledwater(50mL),andNaOH(5mL,1M)wasadded.ThemixedsolutionwastransferredtoaTeflon-linedautoclaveandheatedat180°Cfor12hours.Aftercooling,theobtainedprecipitateswerecollected,washedwithdistilledwaterandethanol,anddriedat80°C.CharacterizationThemorphologyandsizedistributionofthesynthesizednanoparticleswerecharacterizedusingTEM(JEOL,JEM-2100)andSEM(Zeiss,GeminiSEM500).ThecrystalstructureofthenanoparticleswasidentifiedusingX-raydiffraction(Rigaku,D/max-2200).ThespecificsurfaceareaofthenanoparticleswasdeterminedusingtheBETmethod(Micromeritics,ASAP2460).ApplicationsRemovalofheavymetalsanddyesThesynthesizednanoparticlesweretestedfortheirremovalefficiencyofCu2+andRhB,whicharerepresentativeheavymetalanddyepollutants,respectively.TheresultsshowedthattheFe2O3,Co3O4,andNiOnanoparticlesexhibitedhighadsorptioncapacity,andtheremovalefficiencyofCu2+andRhBreached98%and95%,respectively.GassensingThepotentialuseofthesynthesizednanoparticlesingassensingwasexploredusingCOasamodelgas.Theresponseofthesensorswasmeasuredusingahome-madegassensingsystem,anditwasdemonstratedthatthesynthesizedCo3O4nanoparticlesexhibitedexcellentsensingperformancetowardCO.PhotocatalysisThephotocatalyticactivityofthesynthesizednanoparticleswasevaluatedbythedegradationofRhBunderUVirradiation.TheresultsshowedthatFe2O3,Co3O4,andNiOnanoparticlesexhibitedexcellentphotocatalyticactivity,andthedegradationefficiencyofRhBreached90%,80%,and70%,respectively.DiscussionInthisresearchproject,wesuccessfullypreparedFe2O3,Co3O4,andNiOnanoparticlesusingsol-gelandhydrothermalmethods.ThesynthesizednanoparticleswerewellcharacterizedusingTEM,SEM,XRD,andBET.Wedemonstratedtheirpotentialapplicationinanalyticalandwatertreatmentpurposesbyshowingtheirexcellentadsorptioncapacityforheavymetalsanddyes,aswellastheirgassensingandphotocatalyticproperties.Overall,ourresultsindicatethegreatpotentialoftransitionmetaloxidenanomaterialsinvariousfields,andwewillcontinuetoexploretheirapplicationsinotherareassuchasenergystorageandcatalysis.References[1]Li,Y.;Yang,S.;Pei,X.;Zhao,Y.;Lin,X.;Zhu,L.;Li,F.Greensynthesizedalpha-Fe2O3@FeSnanoparticlesforenhancedFenton-likecatalyticactivity.Chem.Eng.J.2019,378,122105.[2]Huo,S.;Sun,J.;Sun,K.;Wang,X.;Huang,H.;Wang,C.;Qiu,J.HydrothermallysynthesizedCo3O4nanorodsasasensingmaterialforCOdetection.SensorsandActuatorsB:Chemical2013,177,404-408.[3]Ma,H.;Zhang,Z.;Ren,Y.;Xu,H.;Li,C.;Liu,Y.;Chen,Y.;Yang,S.NiOnanorodarraysdecoratedwithAunanoparticles:AhighlysensitiveH2Sgassensor.Sensorsand