金红石型纳米二氧化钛制备中的若干影响因素

3142004JOURNALOFBEIJINGUNIVERSITYOFCHEMICALTECHNOLOGYVol.31,No.42004(,100029):TiCl4,pH(TEM)X2(XRD)(BET),,,:;;:TM201:2003212223:,1978,3E2mail:[e-mail],,[124],,,,,TiO24001000,(TiCl4Ti(SO4)2)TiCl4TiO2,,,[527][5],TiCl4TiO2,,,:pH1,,,pH015310,,pH,703h,12h,,TiO2H2800,X(XPertPhiliphs),,TiO22211TiCl4,TiCl45H2O()TiCl42H2O(),TiCl4+5H2OTiCl45H2O(1)TiCl45H2OTiCl3(OH)4H2O+HCl(2)TiCl3(OH)4H2OTiCl2(OH)23H2O+HCl(3)TiCl2(OH)23H2OTiCl(OH)32H2O+HCl(4)TiCl(OH)32H2OTi(OH)4H2O+HCl(5)TiOHHOTiTiOTi+H2O(6)Ti(OH)4H2O(H2TiO3),,Ti(OH)4H2O(6),OH-Cl-,OH-Cl-(TiOTi),Ti(OH)4,H+Cl-,Ti(OH)4H2O,Ti(OH)4,TiO2,;1TiO2XRD,TiCl4013molL-1pH310,703h1TiO2Fig.1InfluenceofcalcineonTiO2,:,70,,,,,,,,,,TiO2212TiCl4,TiCl4,TiCl4,TiO2,,(2(C)(D))2(C)pH=310,703h,TiCl4015molL-1,(D)pH=310,703h,TiCl4011molL-12,(C)(D),,,TiCl4,,(TiCl4/NH3H2O),,TiCl4013molL-1TiCl4013molL-1pH110(),70pH110(),703h3hTiCl4015molL-1TiCl4011molL-1pH310,70pH310,703h3h2TiCl4TiO2TEMFig.2TEMphotographsofTiO2particlesatlowtemperaturefromTiCl4solution213TiCl4,,[8],,,,,,,:,TiO2,Ti(OH)4,,TiO21,,,214pH,pH,H+,pH215,pHTiO2,TiO2714:(2(A)),,NH3H2OZNH+4+OH-TiCl4,,NH+4,pH,,TiO2,pH2(A)TiO2,216,TiO2,TiO2,,,,TiO21,TiO2,TiO2,,,,,TiO2217TiO2XRDTiO2XRD11,2=2713867,3611140,54116923,,TiO2218TiO2BET1,dBET=6/Sw[9](TiO2,SwTiO2),9168nm,TEM1,,,,,TiO21TiO2BETTable1BETanalysisofTiO2t/Sw/(m2/g)dBET/nm70156100910380147175915390134153101473(1)TiCl4,TiO2,TiO2,(2)TiO2,510nm(3)TiCl4,TiO2,;,TiO2;,,,TiO2(4),,,,TiO2(5)TiO2,[1],,.TiO2[J].,1998,26(3):225-229[2],,.[J].,2003,23(1):20-23[3],.[J].,2000(3):37-41[4],,.TiO2[J].,2002(2):51-55[5],,,.[J].,2000,20(7):19-22[6],,,.[J].,2000,20(7):13-16[7],,.[J].,2002,22(12):5-9[8],,.[M].:,2002,25-35[9],,.TiO2[J].,2001,32(3):332-333(22)812004[1].[J].,2000,28(23):25-27[2].[J].,2002,22(12):52-55[3].[J].,2003,35(3):11-13[4],,.[J].,2003,21(1):122-125[5],,,.2Fe2O3[J].,2000,15(6):1093-1096[6],,,.[J].,2000,28(6):585-588[7],,.BaTiO3[J].,1995,10(4):385-388[8],.[M].:,1987,257-264[9],,.[M]..:,2003,229-231ChemicalmodificationofaluminiumhydroxideMaShu2huaGuoFenChenJian2feng(ResearchCenteroftheMinistryofEducationforHighGravityEngineeringandTechnology,BeijingUniversityofChemicalTechnology,Beijing100029,China)Abstract:SodiumaluminatewascarbonatedbyCO2inastirredtankreactortoformaluminiumhydroxide,whichwassubsequentlychemicallymodifiedwithaspecialnon2halogenmodifierunderahightemperatureandpressuretoyieldasubstanceX.BymeansofTG,TEM,XRDandFTIR,itisfoundthatthesubstanceXisanewflatrhombicsubstancewhosedecompositiontemperatureishigherthan340,weightlossapproximately50%,andenthalpyofthermaldecomposition235215kJ/kg.Themainmechanismofthemodificationiscoordi2nationeffectofaluminiumatomwithemptyporbitsandoxygenatomwithisolatedpairsofelectronsinthemod2ifier.Keywords:aluminiumhydroxide;chemicalmodification;newsubstance;coordination()(18)Keyfactorsonpreparionofrutilenano2titaniaHouQiangGuoFen(ResearchCenteroftheMinistryofEducationforHighGravityEngineeringandTechnology,BeijingUniversityofChemicalTechnology,Beijing100029,China)Abstract:NanometertitaniawasdirectlypreparedusingTiCl4solutionatlowertemperaturebyliquidphasede2position.Theeffectsofreactantconcentration,reactiontemperature,pHvalue,additiveandcalcineonTiO2crystallinesizeandmorphologywerediscussed.TheTiO2particleswerecharacterizedbyTEM,XRDandBET.Theresultshowstheproductisquasisphericalrutiletitaniananoparticleswithstableproductquality.Thenano2titaniapowderscanbepreparedwithdifferentsizesandevendispersionbycontrollingreactionconditions.Thismethodissimpleandmaybeemployedtopreparerutilenanocrystalswithoutheattreatment.Keywords:liquidphasedeposition;titania;rutile()222004