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1、ChemicalEngineeringJournal158(2010)458–467ContentslistsavailableatScienceDirectChemicalEngineeringJournaljournalhomepage:www.elsevier.com/locate/cejKineticmodelingof?uorideadsorptionfromaqueoussolutionontobonecharR.Leyva-Ramosa,?,J.Rivera-Utrillab,N.A.Medellin-Castilloa,
2、M.Sanchez-PolobaCentrodeInvestigacionyEstudiosdePosgrado,FacultaddeCienciasQuimicas,UniversidadAutonomadeSanLuisPotosi,Av.Dr.M.NavaNo.6,SanLuisPotosiSLP78210,MexicobDepartamentodeQuimicaInorganica,FacultaddeCiencias,UniversidaddeGranada,18071Granada,Spainarticleinfoabstr
3、actArticlehistory:Therateof?uorideadsorptionfromwatersolutiononbonecharwasinterpretedbyusingadiffusionalReceived19July2009modelaswellaskineticmodels.Theexperimentaldataforthe?uorideconcentrationdecaywereobtainedReceivedinrevisedform11January2010inarotatingbasketadsorber.
4、ThediffusionalmodelconsideredthattheoverallrateofadsorptionwasAccepted12January2010duetothefollowingsteps:externalmasstransfer,intraparticlediffusionandadsorptiononanactivesite.Itwasassumedthattherateofadsorptionontheactivesiteswasinstantaneous.Furthermore,Keywords:theov
5、erallrateofadsorptionof?uoridewascontrolledbytheporevolumediffusion.ThediffusionalAdsorptionmodel?ttedtheexperimentalconcentrationdecaycurvessatisfactorilyandtheeffectiveporevolumeBonechardiffusivityofthe?uorideinthebonecharvariedfrom2.73×10?6to3.71×10?6cm2/s.Thetortuosi
6、tyEffectivediffusivityFluoridefactorofthebonecharwasestimatedfromtheeffectivediffusivityofthe?uorideandvariedbetweenTortuosity1.7and2.3.Itwasrecommendedtouseanaveragetortuosityfactorofp=2.1toestimatetheeffectivediffusioncoef?cientof?uorideinbonechar.Theeffectivediffusiv
7、ityof?uorideandthetortuosityfactorwerenotdependentupontheoperatingconditions.The?rst-,second-andnth-orderkineticmodelswere?ttedtotheexperimentalconcentrationdecaydata.Theresultsrevealedthatthesecond-andthenth-orderkineticmodelsadjustedtheexperimentaldatasatisfactorily;ne
8、vertheless,therateconstantsvariedwiththeoperatingconditionswithoutareasonabletrend.Itwasconcludedthatth
