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1、JournalofColloidandInterfaceScience308(2007)438450www.elsevier.com/locate/jcisIdentificationofselectiveion-exchangeresinforfluoridesorptionS.Meenakshi∗,NatrayasamyViswanathanDepartmentofChemistry,GandhigramRuralUniversity,Gandhigram624302,TamilNadu,IndiaReceived29August200
2、6;accepted8December2006Availableonline29January2007AbstractThedefluoridationcapacity(DC)ofachelatingresin,namelyIndionFR10(IND),andCeraliteIRA400(CER),ananion-exchangeresin,werecomparedundervariousequilibratingconditionsfortheidentificationofselectivesorbent.Theresultsshow
3、edthatchelatingresinismoreselectivethanananion-exchangeresinforfluorideremoval.ThefluoridesorptionwasreasonablyexplainedusingFreundlichandLangmuirisotherms.Thesurfacemorphologyofresinsbeforeandafterfluoridesorptionwasobservedusingscanningelectronmicroscopy(SEM).Fouriertrans
4、forminfraredspectroscopy(FTIR)wasusedforthedeterminationoffunctionalgroupsresponsibleforfluoridesorption.VariousthermodynamicparameterssuchasG0,H0,S0,andEahavebeencalculatedtounderstandthenatureofsorption.Thesorptionkineticmechanismwasstudiedwithreaction-basedanddiffus
5、ion-basedmodels.Thesorptionprocesswasfoundtobecontrolledbypseudo-second-orderandparticlediffusionmodels.Theperformanceoftheresinsstudiedhasbeentestedwithfieldsamplescollectedfromafluoride-endemicarea.©2006ElsevierInc.Allrightsreserved.Keywords:Fluoride;Sorption;IndionFR10;
6、CeraliteIRA400;Freundlich;Langmuir;Pseudo-firstorder;Pseudo-secondorder;Particlediffusion;Porediffusion1.Introductionficult,sincetheorderofselectivityforanionicspeciesbyanion-exchangeresinsisasfollows:citrate>SO2−,oxalate>I−>4Fluorosis,anendemicpublichealthproblem,prevails
7、inNO−>CrO2−>Br−>SCN−>Cl−>formate>acetate3422nationsaroundtheglobe.Itisacripplingdisorderknown>F−[19].Consequentlythecation/chelatingtyperesinsweretooccurduetotheentryoffluorideintothebody.Theex-equallyemployedforsorptionoffluoride[2024].Researchcessiveingestionoffluoridethr
8、oughdrinkingwatercausesworkonfluorideremovalhasbeencarriedoutusingmetal-dental,skeletal,andnonskeletalfo
