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AdsorptionPropertiesofIonicImprintedNanoTiO2onCr(Ⅵ)ZHAORui,ZHANGFan,MAOJingjing,LIUHui etal (CollegeofFoodEngineering,XuzhouInstituteofTechnology,FoodResourceDevelopmentandQualitySafeKeyConstructionLaboratory,Xuzhou,Jiangsu221000)Abstract [Objective]ToresearchtheadsorptionpropertiesofionicimprintednanoTiO2onCr(Ⅵ).[Method]Byusingsurfaceionimprintedtechnique,Cr(Ⅵ)imprintednanometerTiO2waspreparedinaceticacidsolution,withK2Cr2O7astemplatemolecule,chitosanasthefunctionalmonomer,andKH560ascrosslinker.Besides,thestructure,appearanceandadsorptionpropertiesofthispolymerwerestudiedbyadoptingscanningelectronmicroscopy(SEM)andstaticadsorptionbalancedexperiment.[Result]ThispolymerhadagoodabilityofadsorbingCr(Ⅵ)undertheconditionofpH2,adsorptionvibratingfor30minandthe0.30gdosage.Theadsorptionratecouldreach96.2%.Whenputin13mLof1mol/LNaOHsolutionfor40minutes,theratewouldreach90%.Themaximumadsorptioncapacityoftheimprintedandnonimprintedpolymerparticleswere23.5and47.7mg/g,respectively,andtheselectivityofadsorptionwas6.92mg/g.Themaximumenrichmentmultiplewas100.Addingstandardrecoveryratewasbetween95.7% and105.2%,whiletherelativestandarddeviation(RSD)wasbetween1.90% and5.05%.[Conclusion]Cr(Ⅵ)imprintedpolymerhasrelativelygoodadsorptionpropertyandsignificantspecificadsorption.Keywords Ionimprinted;NanoTiO2;Cr(Ⅵ);Enrichment;Separation
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Cr 0.60 12.80 5.88 6.92Cu 0.60 4.05 2.80 1.25Pb 0.60 3.03 1.75 1.28Cd 0.30 1.85 1.20 0.65Zn 0.30 0.50 0.25 0.25
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25 3 2.901 96.750 3 2.814 93.8100 3 2.718 90.6150 3 2.592 86.4200 3 2.064 68.8300 3 2.454 81.8400 3 2.454 75.0500 3 2.001 66.7
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,2011(3):120-123.[3]UYSALM,LRFANA.RemovalofCr(VI)fromIndustrialWastewatersbyAdsorption:PartI:Determinationofoptimumcondition[J].JHazardMater,2007,149(2):482-491.
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[6]ROUNDHILLDM,KOCHHF.Methodsandtechniquesfortheselectiveextractionandrecoveryofoxo-anions[J].ChemSocRev,2002,31(1):60-67.
[7]LIC,CHENH,LIZ.AdsorptiveremovalofCr(VI)byFe-modifiedsteamexplodedwheatstraw[J].ProcessBiochem,2004,39(5):541-545.
[8]DURANA,TUZENM,SOYLAKM.Preconcentrationofsometraceelementsviausingmultiwalledcarbonnanotubesassolidphaseextractionadsorbent[J].Journalofhazardousmaterials,2009,169(1/2/3):466-471.
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[11]STAFIEJA,PHRZYNSKAK.Solidphaseextractionofmetalionsusingcarbonnanotubes[J].Microchemicaljournal,2008,89(1):29-33.
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