地聚合物水泥固化重金属的研究

9320066JOURNALOFBUILDINGMATERIALSVol.9,No.3Jun.,2006:2005-04-27;:2005-06-17:(1963-),,,.E2mail:[e-mail]:1007-9629(2006)03-0341-061,1,1,2(1.,071002;2.,071001):,,,Cu(),Zn(),Pb(),Cd(),Cr()Ni().,.X(XRD)(FTIR)(SEM),.:;;;:O635:AStudyontheSolidificationofHeavyMetalsbyFlyAshBasedGeopolymersXUJian2zhong1,ZHOUYun2long1,TANGRan2xiao1,2(1.CollegeofChemistryandEnvironmentalScience,HebeiUniversity,Baoding071002,China;2.CollegeofScience,AgricultureUniversityofHebei,Baoding071001,China)Abstract:Byusingflyashasbasicingredient,aseriesofflyashbasedgeopolymericmatricesweresynthesizedandsomeexperimentalevidencesaboutimmobilizationefficienciesofheavymet2alssuchasCu(),Zn(),Pb(),Cd(),Cr()andNi()werepresented.Accordingtothetoxicitycharacteristicleachingprocedure(TCLP),itisfoundthattheseheavymetalscanbeeffectivelysolidifiedintothegeopolymericmatrices.ThroughtheresultsofX2raydiffraction(XRD),scanningelectronmicroscopy(SEM)andinfraredspectroscopy(FTIR),itisconcludedthatthesolidificationmechanismofgeopolymertotheseheavymetalsisacombinationofchemi2calbondandphysicalencapsulation.Keywords:flyash;geopolymer;heavymetal;solidification/./[1].,,.,...,©1994-2014ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[2,3].,,[46].,.,.,,ICP2OES,XRD,FT2IR,SEM.11.1(,);(CP,);(AR);(AR);(AR,n1.570.07);(AR);(AR);(AR);(AR);(AR);(AR).6508h..1.1Table1Compositionofflyashw/%SiO2Al2O3CaOFe2O3MgOTiO2SO3IL47.4230.901.885.381.931.500.787.801.2,,3min(0.1%),5min1min,,6024h,14dX(Y-2000,Cu)(SEM2KYKY-2800B)(Vector27,).2,3.2Table2CompositionsofsamplesusedforinvestigationSamplew(metakaolin)/%Typeofalkaliw(alkali)%m(water)/m(flyash)m(SiO2)/m(Al2O3)A16KOH60.671.37B16KOH60.671.37C16NaOH60.671.37DI16KOH60.671.373Table3ContentofheavymetalsinsampleAtoIw/%HeavymetalABCDEFGHICd00.10.10.100000Cr00.10.100.10000Cu00.10.1000.1000Ni00.10.10000.100Pb00.10.100000.10Zn00.10.1000000.12439©1994-2014ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(toxicitycharacteristicleachingprocedure).:(0.032mm)(pH=2.880.05)24h,,4%50,4,(ICP2OES,PerkinElmerOptima4300).22.16BC(2);1.AI4.428dTable4Compressivestrengthsofgeopolymericsamplesafter28dcuringMPaABCDEFGHI22.325.517.531.518.525.025.030.029.54,(C)(B),.,,[5].,6BA;DI.,Cd(D),Pb(H)Zn(I);Cu(F)Ni(G);Cr(E).2.2X(XRD)(SEM)1XRD;2XRD.2,XRD,XRD2040,;,X,X.1,2,.,,.1XRDFig.1X2raydiffractionspectraofflyashandmetakaolin3B,C.3,,.,B,,[2].3433:©1994-2014ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(b)SampleC(a)SampleB3B,CFig.3SEMmicrographoffracturesurfaceofgeopolymericsamplesBandC2.3(IR),[SiO4],AlSi[AlO4],.,SiOSi,OSiOSiOAl.,,[7,8].A,DI4.4:(1)IR1010cm-1,SiOSiAlOSi.,.(2)570cm-1SiOAl.,,SiO4.(3),455cm-1SiO,,.700cm-14AlO4,.4439©1994-2014ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:©1994-2014ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(Pb).,ZnCd.,,.5:(1);(2)CB,C[9].31..,Cd,PbZn,Cr,CuNi.2.,.PbNi,Cr,Zn,CuCd.Pb,,,ZnCd.3.XRD,SEMFTIR,.:[1]HALIMC,AMALR,BEYDOUND,etal.ImplicationsofthestructureofcementitiouswastescontainingPb(),Cd(),As()andCr()ontheleachingofmetals[J].CementandConcreteResearch,2004,34(7):1093-1102.[2]DAVIDOVITSJ.Geopolymers:inorganicpolymericnewmaterials[J].JournalThermalAnalysis,1991,37(8):1633-1656.[3],.[J].,1998,26(2):46-50.[4]vanJAARSVELDJGS,vanDEVENTERJSJ.Thepotentialuseofgeopolymericmaterialstoimmobilisetoxicmetals.Part.Theoryandapplications[J].MineralsEngineering,1997,10(7):659-669.[5]vanJAARSVELDJGS,vanDEVENTERJSJ.Thepotentialuseofgeopolymericmaterialstoimmobilisetoxicmetals.Part.Materialandleachingcharacteristics[J].MineralsEngineering,1999,12(1):75-91.[6]PHAIRJW,vanDEVENTERJSJ.EffectofsilicateactivatorpHontheleachingandmaterialcharacteristicsofwaste2basedinorganicpolymers[J].MineralsEngineering,2001,14(3):289-304.[7]LEEWKW,vanDEVENTERJSJ.Useofinfraredspectroscopytostudygeopolymerizationofheterogeneousamorphousaluminosilicates[J].Langmuir,2003,19(21):8726-8734.[8],,.[J].,2004,22(2):233-239.[9]PHAIRJW,vanDEVENTERJSJ,SMITHJD.Mechanismofpolysialationintheincorporationofzirconiaintoflyash2basedgeopolymerisation[J].Industrial&EngineeringChemistryResearch,2000,39(8):2925-2934.6439©1994-2014ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.