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1、Desalination249(2009)687–693ContentslistsavailableatScienceDirectDesalinationjournalhomepage:www.elsevier.com/locate/desalDefluoridationofdrinkingwaterusingchemicallymodifiedbentoniteclayabbb,⁎SanjayP.Kamble,PriyadarshiniDixit,SadhanaS.Rayalu,NitinK.LabhsetwaraChemicalEngineeringandProcessDevelopmen
2、tDivision,NationalChemicalLaboratory(NCL-CSIR),Dr.HomiBhabhaRoad,Pune-411008,IndiabEnvironmentalMaterialsUnit,NationalEnvironmentalEngineeringResearchInstitute(NEERI-CSIR),NehruMarg,Nagpur-400020,IndiaarticleinfoabstractArticlehistory:Adsorptionpotentialofmetaloxide(lanthanum,magnesiumandmanganese
3、)incorporatedbentoniteclayAccepted26January2009wasinvestigatedfordefluoridationofdrinkingwaterusingbatchequilibriumexperimentstogaininsightofAvailableonline8October2009adsorptionbehavior,kineticsandmechanismsofadsorptionoffluorideion.Theeffectofvariousphysico-chemicalparameterssuchaspH,adsorbentdose
4、,initialfluorideconcentrationandthepresenceofKeywords:interferingco-ionsonadsorptionoffluoridehasbeeninvestigated.The10%La-bentoniteshowshigherDefluoridationfluorideuptakecapacityfordefluoridationofdrinkingwaterascomparedtoMg-bentonite,Mn-bentonite10%La-bentoniteandbarebentoniteclay.Theuptakeoffluoridei
5、nacidicpHwashigherascomparedtoalkalinepH.TheWatertreatmentLangmuirandFreundlichequilibriumadsorptiondatafittedreasonablywellinbothLangmuirandFreundlichisothermmodels.Itwasadsorptionisothermsalsoobservedthatinthepresenceofcertainco-existingionscanhavepositiveeffectonremovaloffluoride,Kineticmodelingw
6、hilecarbonateandbicarbonateanionsshowdeleteriouseffect.Therateofadsorptionwasreasonablyrapidandmaximumfluorideuptakewasattainedwithin30min.Themodifiedadsorbentmaterialshowsbetterfluorideremovalpropertiesforactualfieldwater,whichcouldbeduetothepositiveeffectofotherco-ionspresentinthefieldwater.©2009Else
7、vierB.V.Allrightsreserved.1.Introductiondevelopmentofeffectiveadsorbentmaterialsfordefluoridationofwater.Variousmaterials(e.g.lime,alum,aluminumsulfate,poly-Waterpollutionanditstreatmenttoavailsafedrinkingwaterisa
