简介：W，N共同做TiO2nanoparticles被一个solgel方法综合。准备样品被X光检查衍射(XRD)描绘，域排放扫描电子显微镜学(FE-SEM)，传播电子显微镜学(TEM)，Fourier变换红外线的光谱学(英尺红外)，X光检查光电子光谱学(XPS)和弥漫的反射spectrophotometry(医生)。结果证明共同做的光催化剂是有22.5nm的最小的粒子尺寸的实质上一致的球形的粒子。比作未做的TiO2，N-TiO2和P-25，W的吸收边，N共同做转移到更长的波长的TiO2和它为在Xe灯(350W)下面的甲基橘子(瞬间)的降级的photocatalytic活动更高。
简介：ReactionsofCuSCNwithtetramethylthiuramdisulfideinCH3CNinthepresenceofstyreneandN,N,N',N',N'-pentamethyldiethylenetriaminegaverisetoanewcopper(Ⅰ)complexofN,N'-dimethyldithio-cabamate{[Cu(S2CNMe2)]2}n.ThetitlecompoundcrystallizedinthetriclinicP-1spacegroupwithlatticeparametersα=0.7610(4)nm,b=0.8911(4)nm,c=0.9268(5)nm,α=68.66(1)°,β=83.88(2)°,γ=79.31(2)°,V=0.5748(5)nm^3,Z=2.Thecompoundhasaunique1DchainstructurecomposedofCuSCSCuSCSeight-memberedringsandapairofCu-Sbonds,thestructureofwhichhasbeendeterminedbysingle-crystalX-raycrystallography.Theisolationofthiscompoundmayprovidesomehelpfulinformationforthecauseoftheinductionperiodsofthereverseatomtransferradicalpolymerization.
简介：ThephotodegradationreactionrateofCHCl3inTiO2particulatesuspensionwasimperovedsignificantlybyHCl-treatment.TheeffectofHCl-treatmentonthephotocatalyticactivityofTiO2wasstrdiedinaPECcellbyusingIntensity-ModulatedPhotocurrentSpectroscopy(IMPS).ThemagntudeofphotocurrentresponseandthecharacteristicfrequenciesoftheupperandlowersemicirclesinthecomplexplaneofIMPSresponsewereanalyzed,andtheccathodicandanodicreactionprocessesofphotogeneratedholesandelectronswerediscussed.Theincreasesinthecathodicandanodicphotocurrentresponseandinthetimeconstantsofbothcathodicandanodicreactionprocessesofphotogeneratedholesandelectronswerediscussed.TheincreasesinthecathodicandanodicphotocurrentresponseandinthetimeconstantsofbothcathodicandanodicreactionprocessesindicatethatHCl-treatmentleadstotheimprovementofthephotocatalyticactivityofTiO2andachangeofthephotocatalytickineticmechanism.
简介：Hydrogen,thecleanestandmostpromisingenergyvector,canbeproducedbysolarintochemicalenergyconversion,eitherbythephotocatalyticdirectsplittingofwaterintoH2andO2,or,moreefficiently,inthepresenceofsacrificialreagents,e.g.,intheso-calledphotoreformingoforganics.Efficientphotocatalyticmaterialsshouldnotonlybeabletoexploitsolarradiationtoproduceelectron–holepairs,butalsoensureenoughchargeseparationtoallowelectrontransferreactions,leadingtosolarenergydriventhermodynamicallyup-hillprocesses.RecentachievementsofourresearchgroupinthedevelopmentandtestingofinnovativeTiO2-basedphotocatalyticmaterialsarepresentedhere,togetherwithanoverviewonthemechanisticaspectsofwaterphotosplittingandphotoreformingoforganics.Photocatalyticmaterialswereeither（i）obtainedbysurfacemodificationofcommercialphotocatalysts,orproduced（ii）inpowderformbydifferenttechniques,includingtraditionalsolgelsynthesis,aimingatengineeringtheirelectronicstructure,andflamespraypyrolysisstartingfromorganicsolutionsoftheprecursors,or（iii）inintegratedform,toproducephotoelectrodeswithindevices,byradiofrequencymagnetronsputteringorbyelectrochemicalgrowthofnanotubearchitectures,orphotocatalyticmembranes,bysupersonicclusterbeamdeposition.
简介：HomogeneousNi2+-dopedtitaniagelwassynthesizedbyasol-gelprocess,andthexerogelwasthenobtainedthroughaginganddrying,leadingtotheformationofNi/TiO2nanocompositeafterheattreatmentunderasuitablereducingatmosphere.TheresultingnanocompositewascharacterizedbyTGA-DSC,TEM,XRDandBETmethods.Theresultsshowthatthestructureandgrainsizeofthenanocompositescouldbemanipulatedbyalteringtheheat-treatmentconditions,andthatthenanocompositepossessesamesoporousstructurewithaporeradiusofca.28nmandaspecifictheanatase-rutilephasetransformation.
简介：hePhotocatalyticcharacterizationofTiO2supportedonactivecarbonwasinvestigatedforphotocatalyticdecompositionofdichloroaceticacid.ItwasfoundthatTiO2/ACexhibitedahigherphotocatalyticactivitythanpureTiO2.ThereasonisthatactivecarbonactingaspowerfuladsorbentsupportsmakeshighconcentrationenvironmentsoforganicpollutantmoleculesaroundTiO2particles.
简介：Twonewdicyanamidecoordinationpolymers,{Mn(dmpz)[N(CN)2]2}2(1)and{Cu(dmpz)[N(CN)2]2}2(2)(dmpz=3,5-dimethylpyrazole),weresynthesizedandcharacterizedbysinglecrystalX-raydiffractionanalysisandIRspectroscopy.In1and2themetalionshavetwodifferentcoordinationmodes,whereoneiscoordinatedtofourdicyanamideanionsandtwomonodentatedmpzmoleculestoformaslightlydistortedoctahedralgeometry,whiletheotheradoptsoctahedralgeometry,surroundedbyfournitrileNatomsandtwoamideNatomsofthedicyanamideanions.Bothcomplexescontaintwoalternatingchainsthatareparalleltoeachother.
简介：TiO_2-coatedpolystyrenenanoparticleswerepreparedinasimpleway.First,functionalPSparticlesweresynthesizedbycopolymerizingonekindofpolymerizablesurfactantwithstyrene.Thenthestabledispersionsofpolystyrenenanoparticleswereusedastemplates,andpolystyrenenanoparticleswerecoatedwithtitaniabyinsituhydrolysisoftetra-n-butyltitanate(TBT).Nosurfacetreatmentandcentrifugation/redispersioncycleprocesswereneededduringthewholeexperiment.IsolatedPSsphereswithuni...
简介：AseriesofTiO2-XSiO2[Xdenotesthemolarfraction(%)ofsilicainthemixedoxides]withdifferentn(Ti)/n(Si)ratioswaspreparedwithammoniawaterasahydrolysiscatalyst.ThephotocatalystspreparedwerecharacterizedbyXRD,thermalanalysis,FTIR,UV-VisandSPS.ThecharacterizationresultsofFTIRandUV-VisspectrashowthatTiatomsweregraduallychangedfromoctahedralcoordinationtotetrahedralcoordinationwiththeadditionofsilica,whichisnotbeneficialforobtainingstrongBrnstedacidityandhigherphotocatalyticactivity.Thephotocatalyticactivityexperiments,whichwereconductedbyusingheptane(orSO2)asthemodelreactant,showedthatTiO2-SiO2containingasuitableamountofsilicacanexhibitmuchhigherphotocatalyticactivitythanpureTiO2.Theenhancedphotocatalyticactivitycanbeattributedtothreefollowingfactors:(1)smallercrystallinesize;(2)higherthermalstability;(3)thenewstrongBrnstedacidity.
简介：ElectrolyticfixationofCO2wasinvestigatedbyelectrocarboxylationoforganichalides(RX),andfourestersⅠ,ⅡⅢ,Ⅳ)wereobtainedinmoderateyields.ElectrochemicalreductionesterificationsofRXinthepresenceofCO2werecarriedoutonnanocry'stallineTiO2-Ptelectrode.TheelectrochemicalbehaviorofRXinthepresenceofCO2wasinvestigatedbythetechniqueofcyclicvoltammetry,andtheprobablereactionmechanismw,asproposed.
简介：Aseriesofaromaticimineswerereducedtocorrespondingaminesinexcellentyieldsby2-phenyl-N,N-dimethylbenzimidazoline(PDMBI)photochemicallyinthepresenceofmagnesiumperchloride(Mg(ClO4)2).AMg2+mediatedphotoinducedelectrontransfermechanismwasproposed.
简介：采用HF/DFT的混合泛函PBE0和UPBE0优化了配合物[Os（PH3）2（CN）2（N^N）]（其中N^N=2,2′-吡啶）的基态和激发态结构.在基态和激发态结构的基础上,利用含时密度泛函理论（TD-DFT）方法,结合极化连续介质（PCM）模型分别计算了它在二氯甲烷（1）、甲醇（2）、气态（3）和乙腈（4）溶液中的吸收和发射光谱.研究结果表明：优化得到的几何结构参数和相应的实验值符合得非常好.在极性较大的溶剂（2和4）中Os—P（1）和Os—C（1）键较长,Os—N（3）键较短,溶剂的极性会影响配合物的电子云分布.配合物在1-4溶剂中的最低能吸收和发射均来自分子轨道68→71的激发,该激发被指认为[d（Os）＋π（CN）＋π（N^N）→π＊（N^N）]的跃迁具有混合的MLCT/LLCT特征.配合物在1-4溶剂中的最低能吸收和发射分别在471,410,488和445nm以及598,536,634和545nm,表明随着溶剂极性的逐渐增大（3〈1〈4〈2）,最低能吸收和发射发生明显的蓝移.这显示出通过改变溶剂极性可以调节配合物的发光颜色.
简介：NineteenL-N-2-hydroxyethylaminoacidsandL-N,N-bis(2-hydroxyethyl)aminoacidswerepreparedfromthereactionofchlorohydrinwithL-alanine,L-valine,L-leucine,L-isoleucine,L-phenylalanine,L-serine,L-thrcunine,L-glutamicacid,L-asparticacidandglycine.L-N,N,N’,N’-tetra(2-hydroxyethyl)cystinewaspreparedbythereactionofL-cystinewithchlorohydrin.
简介：Theadsorptioncapabilityofloamsoilfornano-TiO2affectedbytheamountandintensityofleachedwaterhasbeeninvestigatedbysimulatingthenaturalrainfallprocessundertheleachingcondition.Theresultsshowthattheamountandtheintensityofleachedwateraretwoimportantfactorsaffectingtheadsorptioncapabilityofloamsoilfornano-TiO2.Theresultsindicatethatthedepthoftheloamsoilcontainingamaximalamountofnano-TiO2isproportionaltotheamountofleachedwater,whileitisinverselyproportionaltotheintensityofleachedwater,ataconstantamountoftheleachedwater.Itwasalsofoundthattheadsorptioncapabilityofsoilsfornano-TiO2canbeimprovedbyaddingothermaterials,suchasdissolvedorganicmatter(DOM),bentoniteandstraw.ItwasfoundthatDOMisthebestsorbentforimprovingtheadsorptioncapabilityofloamsoilfornano-TiO2,followedbybentonite,whilestrawisnotsuitableforthemodificationofloamsoil.Theimprovementofadsorptioncapabilityofloamsoildependsontheamountoftheseadditives.Nano-TiO2canbeeffectivelyadsorbedonthesurfacelayerofloamsoilcontaininganappropriateamountofadditive.
客服QQ：30444492琼网文【2021】1550-113号
增值电信业务经营许可证：琼B2-20210322
出版物经营许可证：新出发龙华出字第(2021)009号
广播电视节目制作经营许可证：(琼)字第00779号
版权所有 ©2002-2024 期刊网(www.qikanchina.com) 琼ICP备2021005105号
![Synthesis and Crystal Structure of <b style='color:red'>N</b>,<b style='color:red'>N</b>＇-Dimethyldithio-arbamato-Copper（Ⅰ） Polymer {[Cu（Me<b style='color:red'>2</b>dtc）]<b style='color:red'>2</b>}<b style='color:red'>n</b>](/image/thesis2 "Synthesis and Crystal Structure of <b style='color:red'>N</b>,<b style='color:red'>N</b>＇-Dimethyldithio-arbamato-Copper（Ⅰ） Polymer {[Cu（Me<b style='color:red'>2</b>dtc）]<b style='color:red'>2</b>}<b style='color:red'>n</b>")
![Two New Dicyanamide Coordination Polymers with Alternating Parallel Chains： {Mn（dmpz）[<b style='color:red'>N</b>（CN）<b style='color:red'>2</b>]<b style='color:red'>2</b>}<b style='color:red'>2</b> and {Cu（dmpz）[<b style='color:red'>N</b>（CN）<b style='color:red'>2</b>]<b style='color:red'>2</b>}<b style='color:red'>2</b>](/image/thesis7 "Two New Dicyanamide Coordination Polymers with Alternating Parallel Chains： {Mn（dmpz）[<b style='color:red'>N</b>（CN）<b style='color:red'>2</b>]<b style='color:red'>2</b>}<b style='color:red'>2</b> and {Cu（dmpz）[<b style='color:red'>N</b>（CN）<b style='color:red'>2</b>]<b style='color:red'>2</b>}<b style='color:red'>2</b>")
![[Os（PH_3）_<b style='color:red'>2</b>（CN）_<b style='color:red'>2</b>（<b style='color:red'>N</b>^<b style='color:red'>N</b>）]配合物的溶剂化显色效应](/image/thesis16 "[Os（PH_3）_<b style='color:red'>2</b>（CN）_<b style='color:red'>2</b>（<b style='color:red'>N</b>^<b style='color:red'>N</b>）]配合物的溶剂化显色效应")
