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《Sorption behavior of fluoride ions from aqueous solutions by hydroxyapatite》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、JournalofHazardousMaterials180(2010)297–302ContentslistsavailableatScienceDirectJournalofHazardousMaterialsjournalhomepage:www.elsevier.com/locate/jhazmatSorptionbehavioroffluorideionsfromaqueoussolutionsbyhydroxyapatiteM.Jiménez-Reyes,M.Solache-Ríos∗InstitutoNacionaldeIn
2、vestigacionesNucleares,Depto.deQuímica,Apdo.Postal18-1027,11801México,D.F.,MexicoarticleinfoabstractArticlehistory:TheeffectsofpH,contacttime,fluoride-ionconcentration,andthedoseofsorbentonthesorptionofReceived13January2010fluorideionsbyhydroxyapatitewerestudied.Equilibriu
3、mwasreachedin16hofcontacttimeandtheReceivedinrevisedform26March2010maximumsorptionoffluorideionswasinthepHeqrangebetween5and7.3.ThehighestefficiencyintheAccepted7April2010sorptionsystemwasdeterminedbyusing0.01gofhydroxyapatiteand25mLofsolution.Thepseudo-Availableonline14Ap
4、ril2010secondordermodeldescribedthekineticsorptionprocesses,andtheFreundlichmodel,thesorptionisothermprocess.TheseresultsindicatedthatthemechanismwaschemisorptiononaheterogeneousKeywords:material.Fluorideionswerepartiallydesorbedusinganalkalinesolution.Fluoride©2010Elsev
5、ierB.V.Allrightsreserved.SorptionHydroxyapatite1.Introductiontheeffectofotheranions,andtheconcentrationoffluorideionsinthefluoridesorptionwithanano-hydroxyapatite/chitincompos-Fluorideisanessentialconstituentforbothhumanandanimals;ite.Thepurposeofthepresentpaperwastocarryo
6、utasystematichowever,thetotalamountingestedoritsconcentrationindrinkingstudyofparameterssuchaspH,contacttime,fluoride-ionconcen-watermustbewithincertainlimits[1].Forexample,accordingtotrationandsorbentdoseinordertoelucidatethesorptionbehaviorTheWorldHealthOrganization(WHO
7、)standardsthepermissibleoffluorideionsbyhydroxyapatiteaswellasthedesorptionofflu-limitoffluorideis1.5mgL−1.Fluoride-relatedhealthhazardsareaorideionsfromthismaterialbydifferentsolutions.majorenvironmentalprobleminmanyregionsoftheworld.Whenthefluorideconcentrationishigherthan
8、thepermissiblelimit,it2.Materialsandmethodscausesdentalandskeletalfluorosis,bonediseases,mottlingofteeth
