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《Kinetic modeling of fluoride adsorption from aqueous solution onto bone char》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、ChemicalEngineeringJournal158(2010)458–467ContentslistsavailableatScienceDirectChemicalEngineeringJournaljournalhomepage:www.elsevier.com/locate/cejKineticmodelingoffluorideadsorptionfromaqueoussolutionontobonecharR.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:TherateoffluorideadsorptionfromwatersolutiononbonecharwasinterpretedbyusingadiffusionalReceived19July2009modelaswellaskineticmodels.TheexperimentaldataforthefluorideconcentrationdecaywereobtainedReceivedinrevisedform11January2010inarotatingbasketadsorber.
4、ThediffusionalmodelconsideredthattheoverallrateofadsorptionwasAccepted12January2010duetothefollowingsteps:externalmasstransfer,intraparticlediffusionandadsorptiononanactivesite.Itwasassumedthattherateofadsorptionontheactivesiteswasinstantaneous.Furthermore,Keywords:theov
5、erallrateofadsorptionoffluoridewascontrolledbytheporevolumediffusion.ThediffusionalAdsorptionmodelfittedtheexperimentalconcentrationdecaycurvessatisfactorilyandtheeffectiveporevolumeBonechardiffusivityofthefluorideinthebonecharvariedfrom2.73×10−6to3.71×10−6cm2/s.Thetortuosi
6、tyEffectivediffusivityFluoridefactorofthebonecharwasestimatedfromtheeffectivediffusivityofthefluorideandvariedbetweenTortuosity1.7and2.3.Itwasrecommendedtouseanaveragetortuosityfactorofp=2.1toestimatetheeffectivediffusioncoefficientoffluorideinbonechar.Theeffectivediffusiv
7、ityoffluorideandthetortuosityfactorwerenotdependentupontheoperatingconditions.Thefirst-,second-andnth-orderkineticmodelswerefittedtotheexperimentalconcentrationdecaydata.Theresultsrevealedthatthesecond-andthenth-orderkineticmodelsadjustedtheexperimentaldatasatisfactorily;ne
8、vertheless,therateconstantsvariedwiththeoperatingconditionswithoutareasonabletrend.Itwasconcludedthatth
