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1、JournalofHazardousMaterials168(2009)888–894ContentslistsavailableatScienceDirectJournalofHazardousMaterialsjournalhomepage:www.elsevier.com/locate/jhazmatRemovalof?uorideionsfromaqueoussolutionbywastemudBarisKemera,DuyguOzdesa,AliGundogdua,VolkanN.Buluta,CelalDurana,MustafaSoyla
2、kb,?aKaradenizTechnicalUniversity,FacultyofArts&Sciences,DepartmentofChemistry,61080Trabzon,TurkiyebErciyesUniversity,FacultyofArts&Sciences,DepartmentofChemistry,38039Kayseri,TurkiyearticleinfoabstractArticlehistory:Thepresentstudywascarriedouttoassesstheabilityoforiginalwastem
3、ud(o-WM)anddifferentReceived16January2009typesofactivatedwastemudwhichareacid-activated(a-WM)andprecipitatedwastemud(p-WM),inReceivedinrevisedform19February2009ordertoremoveexcessof?uoridefromaqueoussolutionbyusingbatchtechnique.Thep-WMexhibitedAccepted19February2009greaterperfo
4、rmancethantheothers.AdsorptionstudieswereconductedasafunctionofpH,contacttime,Availableonline3March2009initial?uorideconcentration,adsorbentconcentration,temperature,etc.Studieswerealsoperformedtounderstandtheeffectofsomeco-existingionspresentinaqueoussolutions.Adsorptionprocess
5、wasKeywords:foundtobealmostindependentofpHforalltypesofwastemud.AmongthekineticmodelstestedFluorideforp-WM,pseudo-second-ordermodel?ttedthekineticdatawellwithaperfectcorrelationcoef?cientRemovalAdsorptionvalueof1.00.Itwasfoundthattheadequatetimefortheadsorptionequilibriumof?uori
6、dewasonly1h.ThermodynamicparametersincludingtheGibbsfreeenergy(G?),enthalpy(H?),andentropy(S?)Wastemudrevealedthatadsorptionof?uorideionsonthep-WMwasfeasible,spontaneousandendothermicinthetemperaturerangeof0–40?C.Experimentaldatashowedagood?twiththeLangmuirandFreundlichadsorp
7、tionisothermmodels.ResultsofthisstudydemonstratedtheeffectivenessandfeasibilityofWMforremovalof?uorideionsfromaqueoussolution.?2009ElsevierB.V.Allrightsreserved.1.Introductionber,fertilizermanufacturingandnaturalsources[5,6].AccordingtotheWorldHealthOrganization(WHO)themaximumal
8、low-Fluorideisanaturalmineralthatisfoundinmanyf
