简介:Anovelgraphene/Agnanoparticles(NPs)hybrid(preparedbyaphysicalmethod(PM))wasincorporatedintoelectrospunTiO2fiberstoimprovevisible-light-drivenphotocatalyticproperties.Theexperimentalstudyrevealedthatthegraphene/AgNPs(PM)hybridnotonlydecreasedthebandgapenergyofTiO2,butalsoenhanceditslightresponseinthevisibleregionduetothesurfaceplasmonresonance(SPR)effect.Inaddition,comparedwiththoseofTiO2fibersincorporatingthegraphene/AgNPshybrid(preparedbyachemicalmethod(CM)),TiO2-graphene/AgNPs(PM)fibersexhibitedahighersurfacephotocurrentdensityandsuperiorphotocatalyticperformance,i.e.,thevisible-light-drivenphotocatalyticactivitywasenhancedby2times.Themainreasonsincludealowersurfacedefectdensityofthegraphene/AgNPs(PM)hybrid,asmallerparticlesize(10nm)andahigherdispersityofAgNPs,whichpromotetherapidtransferofphotoexcitedchargecarriersandinhibittherecombinationofphotogeneratedelectronsandholes.Itisexpectedthatthiskindofternaryelectrospunfiberswillbeapromisingcandidateforapplicationsinwatersplitting,solarcells,CO2conversionandoptoelectronicdevices,etc.
简介:Bismuth-basedSillen-Aurivilliuscompoundsarebeingexploredasefficientphotocatalystmaterialsforthedegradationoforganicpollutantsduetotheiruniquelayeredstructurethatfavourseffectiveseparationofelectron-holepairs.Inthiswork,wesynthesizedSillen-Aurivillius-relatedBi2YO4CIwiththebandgapof2.5eVbyasimplesolid-statereactionandsensitizedwithrhodiumnickel(RhNi)nanoparticles(NPs)toformtheRhNi/Bi2YO4CIheterostructure.PhotocatalyticactivitiesofBiOCI,Bi2YO4CIandtheRhNi/Bi2YO4CIheterostructurewereexaminedforthedegradationofrhodamine-6Gundervisible-lightillumination.ResultsdemonstratedthatthephotocatalyticdyedegradationefficiencyofRhNi/Bi2YO4CIheterostructuresishigherthanthoseofBiOCIandBi2YO4CI,attributedtothesynergisticmolecular-scalealloyingeffectofbimetallicRhNiNPs.Theplausiblemechanismforthedegradationofrhodamine-6Gandtheeffectiveelectron-holepairutilizationmechanismwerediscussed.
简介:Aone-pot,solvent-thermalprocesswasusedtocreatetheultrafineZnFe2O4nanoparticlesphotocatalyst.Duringthesolvent-thermalprocess,theinsituself-formingNaClnotonlyservedasa"cage"toconfinetheiondiffusion,butalsoactedasamicroreactorfornanocrystallitegrowth.Anaverageparticlesizeof~10nmandahigh-specificsurfaceareaof~112.9m2/gwereobservedfortheultrafineZnFe2O4nanoparticlesOwingtothesynergisticeffectofultrafineparticlesize,thefullutilizationofthevisiblelightregionandhighconductionband(CB)position,ultrafineZnFe2O4photocatalystdisplayedanefficientphotocatalyticCO2reductionundervisiblelightillumination.Besides,theultrafineZnFe2O4photocatalystshowedhighproductionselectivityforCH3CHOandC2H5OHgenerationinaqueousCO2/NaHCO3solution.Thisworkmayprovideanewideaforthesynthesisofnewhigh-efficiencyphotocatalysts.
简介:WithFe(NO3)39H2OandBi(NO3)35H2Oasrawmaterials,differentsillenite-typecompoundsandelementalbismuthwerepreparedbyafacileone-potsolvothermalmethodusingH2O,C2H5OH,(CH2OH)2andC3H8O3assolvents,respec-tively.Thestructure,morphology,elementalcompositionsandpropertiesofsampleswereexaminedbyXRD,SEM,TEM,ICP,XPS,N2adsorptionanddesorption,UV-visDRSandPL.ThephotocatalyticactivitiesofdifferentsampleswereevaluatedbythephotodegradationofRhBundervisible-lightirradiation(λ>400nm),andresultsshowthatBi36Fe2O57preparedusingC2H5OHasthesolventownstheoptimumperformance.Inordertoexplorethereactionmechanism,anadditionalexperimentwasdesignedtoinvestigatethemainactivespeciesduringthephotodegradationprocessviadissolvingdifferenttrappingagentsinthereactionsolutionbeforelightirradiation.TheresultsshowthatsuperoxideradicalanionsplayamajorroleinthissystemsincetheRhBdegradationwassignificantlysuppressedaftertheadditionofbenzoquinone.
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简介:AseriesofCd1-xZnxS/K2La2Ti3O10compositesweresynthesizedviaasimpleco-precipitationmethod.ThepreparedsampleswerecharacterizedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),X-rayenergydispersivespectroscopy(EDX),ultraviolet-visiblediffusereflection(UV-Vis),X-rayphotoelectronspectroscopy(XPS)andphotoluminescence(PL)measurements.ThecompositestructuresconsistedofCd1-xZnxSnanoparticlesevenlydistributedonthesurfaceofK2La2Ti3O10.TheabsorptionedgeofK2La2Ti3O10shiftedtothevisiblelightregionuponintroductionoftheCd1-xZnxSnanoparticles.Thephotocatalyticactivitiesofthecatalystswereevaluatedbyhydrogenproductionundervisiblelightirradiation.ThepreparedCd0.8Zn0.2S(30wt%)/K2La2Ti3O10exhibitedhigherphotocatalyticactivity,evolving6.92mmol/gH2undervisiblelightirradiationfor3h.ThepromotedphotocatalyticactivityofthecompositeswasattributedtothesynergisticeffectbetweenCd1-xZnxSandK2La2Ti3O10,whichresultedinenhancedseparationofphotogeneratedelectronsandholes.