資源描述：
《Removal of fluoride ions from aqueous solution at low》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、Availableonlineatwww.sciencedirect.comJournalofHazardousMaterials152(2008)571579Removalof?uorideionsfromaqueoussolutionatlowpHusingschwertmanniteAkbarEskandarpoura,MauriceS.Onyangob,?,AoyiOchiengc,ShigeoAsaiaaMaterial,PhysicsandEnergyEngineering,NagoyaUniversity,Nagoya464-8603
2、,JapanbCentreforProcessEngineering,DepartmentofProcessEngineering,UniversityofStellenbosch,Stellenbosch,PrivateBagX1,Matieland7602,SouthAfricacSchoolofChemicalandMetallurgicalEngineering,UniversityofWitwatersrand,PrivateBag3,Wits2050,SouthAfricaReceived13November2006;receivedi
3、nrevisedform16April2007;accepted10July2007Availableonline12July2007AbstractWastewatercontaining?uoriderequirespolishingafterprecipitation/coagulationtreatmentinordertomeetstringentenvironmentallegislation.Accordingly,adsorptioncharacteristicsof?uorideontoschwertmanniteadsorben
4、twerestudiedinabatchsystemwithrespecttochangesininitialconcentrationof?uoride,equilibriumpHofsamplesolution,adsorbentdosageandco-existingions.Equilibriumadsorptiondatawereobtainedat295.6,303and313K,andareinterpretedintermsoftwo-siteLangmuir,Freundlich,LangmuirFreundlich,Redlic
5、hPeterson,Toth′andDubininRadushkevitchisothermmodels.Theexperimentalandequilibriummodelingresultsrevealedthatthecapacityofschwertmannitefor?uorideishighbutinsensitivetochangesinsolutiontemperature.AnincreaseinequilibriumpHofsamplesolutionreducedsigni?cantlythe?uorideremovalef?
6、ciency.Inbinarycomponentsystems,inner-spherecomplexformingspecieshadnegativeeffectson?uorideadsorptionwhileouter-spherecomplexformingspeciesimprovedslightlythe?uorideremovalef?ciency.Theschwertmanniteadsorbentwasregenerableandhadtheabilitytolowerthe?uorideconcentrationtoaccept
7、ablelevels.?2007ElsevierB.V.Allrightsreserved.Keywords:Fluoride;Schwertmannite;Removal;Polishing;Treatment;Adsorption;Wastewater1.Introduction?uorideionsrequiresarobustandaneffectivetechnique.Duetothehighconcentrationof?uorideintheindustrialef?uent,theManagementofhealthhazardo
8、usionssuchas?uorideisofmostpopularlyappliedseparationtechnolo
