简介：Organicamendmentssuchasvermicompostandbiocharhavebeenreportedtoenhancesoilfertilityandcropproductivity.However,whethertheco-applicationofbothamendmentshassynergisticeffectsorwhethersuchbenefitsareaccompaniedbytheriskofgaseousnitrogen(N)lossinanagroecosystemremainsunknown.Asoilcolumnexperimentwithafullyfactorialdesignwasconductedusingthreelevelsofvermicompost(nodose,lowdose(1%,weight:weight),andhighdose(3%,weight:weight))withoutorwithbiochar(1%,weight:weight)toinvestigatetheireffectsonricegrowthandgaseousNlossacrossthecropgrowingseason.Ourresultsdemonstratedthatsynergisticinteractionsexistedbetweenvermicompostandbiocharinpromotingcropyield.Comparedwithbiocharamendmentalone,biocharcombinedwithvermicompostsignificantly(P<0.01)increasedriceyieldby26.5%–35.3%.However,highdoseofvermicompostsignificantly(P<0.01)increasedthecumulativeammonia(NH3)andnitrousoxide(N2O)emissions.Inthepresenceofvermicompost,theincorporationofbiocharamendmentsignificantly(P<0.01)decreasedthecumulativeN2Oemissionby14.1%–18.6%.ThelowestemissionfactorvalueofNH3andN2Owasachievedusingbiocharincombinationwithlowdoseofvermicompost.Thisstudyrevealedthatthecombinationofbiocharandmoderatedoseofvermicompostoffersanovelapproachtopromotecropproductivitywhilereducingtheenvironmentalrisk.

简介：有10厘米的规模的镉硫化物(CdS)缓冲区层

简介：Aseriesofhighsurfaceareagraphiticcarbonmaterials(HSGCs)werepreparedbyball-millingmethod.EffectofthegraphiticdegreeofHSGCsonthecatalyticperformanceofBa-Ru-K/HSGC-x(xistheball-millingtimeinhour)catalystswasstudiedusingammoniasynthesisasaprobereaction.ThegraphiticdegreeandporestructureofHSGC-xsupportscouldbesuccessfullytunedviathevariationofball-millingtime.RunanoparticlesofdifferentBa-Ru-K/HSGC-xcatalystsarehomogeneouslydistributedonthesupportswiththeparticlesizesrangingfrom1.6to2.0nm.ThegraphiticdegreeofthesupportiscloselyrelatedtoitsfacileelectrontransfercapabilityandsoplaysanimportantroleinimprovingtheintrinsiccatalyticperformanceofBa-Ru-K/HSGC-xcatalyst.更多还原

简介：Core-shellstructurednanosphereswithmesoporoussilicashellandNicore(denotedasNi@meso-SiO2)arepreparedthroughathree-stepprocess.MonodispersedNiprecursorsarefirstprepared,andthencoatedwithmesoporousSiO2.FinalNi@meso-SiO2spheresareobtainedaftercalcination.TheproductsarecharacterizedbyX-raypowderdiffraction,transmissionelectronmicroscopyandN2adsorption-desorptionmethods.Thesesphereshaveahighsurfaceareaandarewelldispersedinwater,showingahighcatalyticactivitywithaTOFvalueof18.5,andoutstandingstabilityinhydrolyticdehydrogenationofammoniaboraneatroomtemperature.

简介：Toimprovetheinitialcoulombicefficiencyandbulkdensityoforderedmesoporouscarbons,activeFe2O3nanoparticleswereintroducedintotubularmesoporechannelsofCMK-5carbon,whichpossesseshighspecificsurfacearea(>1700m2g-1)andlargeporevolume(>1.8cm3g-1).FineFe2O3nanoparticleswithsizesintherangeof57nmwerehighlyandhomogenouslyencapsulatedintoCMK-5matrixthroughammonia-treatmentandsubsequentpyrolysismethod.TheFe2O3loadingwascarefullytailoredanddesignedtowarrantahighFe2O3contentandadequatebufferspaceforimprovingtheelectrochemicalperformance.Inparticular,suchFe2O3andmesoporouscarboncompositewith47wt%loadingexhibitsaconsiderablystablecycleperformance(683mAhg-1after100cycles,99%capacityretentionagainstthatofthesecondcycle)aswellasgoodratecapability.Thefabricationstrategycaneffectivelysolvethedrawbackofsinglematerial,andachieveahigh-performancelithiumelectrodematerial.

简介：Selectivecatalyticoxidation(SCO)ofammoniawascarriedoutoverCu-MncompoundscatalystsmodifiedwithtrivalentrareearthoxideCe2O3andLa2O3respectively.TiO2wasusedassupportanddifferentratioofO2weretestedinordertofindanappropriateO2concentration(vol.%),andtheresultsshowedthat1%O2(vol.%)waspropitioustoSCOofammonia.TheeffectsofthetworareearthoxidesmodifiedcatalystsCe2O3-Cu-Mn/TiO2andLa2O3-Cu-Mn/TiO2onthecatalyticactivityandselectivityofammoniaoxidationwereinvestigatedunderthereactionconditionof500ppmammonia,1%O2(vol.%),atthetemperaturefrom125to250oC.TheresultsrevealedthebeneficialroleofCe2O3andLa2O3incatalyticactivityatlowtemperatureandleanoxygenconcentration,whilethemodificationwithCe2O3andLa2O3ledtothenegativeinfluenceonN2selectivity.ForthecatalystsmodifiedwithCeshowedlowerNOandN2OselectivitythanthecatalystsmodifiedwithLa,thentheeffectsofdifferentCeloadingsoncatalyticactivityandselectivitywerealsoconsidered,incombinationwithcatalystspreparationmethods,whichincludeincipientwetimpregnation,sol-gelmethodandco-precipitation.Resultsrevealedthatthecatalystspreparedbysol-gelmethodobtainedpreferablecatalyticactivitycomparedwiththeothers,reaching99%ammoniaat200oC,whereas96%NOwasdetected.Italsoindicatedthatdifferentcatalystpreparationmethodsignificantlydeterminedproductiondistribution.