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《Removal of fluoride ions from aqueous solution by waste mud》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、JournalofHazardousMaterials168(2009)888–894ContentslistsavailableatScienceDirectJournalofHazardousMaterialsjournalhomepage:www.elsevier.com/locate/jhazmatRemovaloffluorideionsfromaqueoussolutionbywastemudBarisKemera,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),inReceivedinrevisedform19February2009ordertoremoveexcessoffluoridefromaqueoussolutionbyusingbatchtechnique.Thep-WMexhibitedAccepted19February2009greaterperfo
4、rmancethantheothers.AdsorptionstudieswereconductedasafunctionofpH,contacttime,Availableonline3March2009initialfluorideconcentration,adsorbentconcentration,temperature,etc.Studieswerealsoperformedtounderstandtheeffectofsomeco-existingionspresentinaqueoussolutions.Adsorptionprocess
5、wasKeywords:foundtobealmostindependentofpHforalltypesofwastemud.AmongthekineticmodelstestedFluorideforp-WM,pseudo-second-ordermodelfittedthekineticdatawellwithaperfectcorrelationcoefficientRemovalAdsorptionvalueof1.00.Itwasfoundthattheadequatetimefortheadsorptionequilibriumoffluori
6、dewasonly1h.ThermodynamicparametersincludingtheGibbsfreeenergy(G◦),enthalpy(H◦),andentropy(S◦)Wastemudrevealedthatadsorptionoffluorideionsonthep-WMwasfeasible,spontaneousandendothermicinthetemperaturerangeof0–40◦C.ExperimentaldatashowedagoodfitwiththeLangmuirandFreundlichadsorp
7、tionisothermmodels.ResultsofthisstudydemonstratedtheeffectivenessandfeasibilityofWMforremovaloffluorideionsfromaqueoussolution.©2009ElsevierB.V.Allrightsreserved.1.Introductionber,fertilizermanufacturingandnaturalsources[5,6].AccordingtotheWorldHealthOrganization(WHO)themaximumal
8、low-Fluorideisanaturalmineralthatisfoundinmanyf
