Removal of fluoride from water through ion exchange by mesoporous

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1、JournalofColloidandInterfaceScience272(2004)399403www.elsevier.com/locate/jcisRemovaloffluoridefromwaterthroughionexchangebymesoporousTioxohydroxideLiNgeeHo,∗TatsumiIshihara,SoichiroUeshima,HiroyasuNishiguchi,andYusakuTakitaDepartmentofAppliedChemistry,870-1192OitaUniversity,O

2、ita,JapanReceived30June2003;accepted19August2003AbstractInourpreviousstudy,wefoundthatTi(OH)4exhibitedfluorideionexchangeproperties.Inordertoimprovetheionexchangecapacity,mesoporousTioxohydroxide(TiOx(OH)y)hadbeenpreparedbyusingdodecylamineastemplate.Zirconiaandsilicahadbeenin

3、troducedintothemesoporousTioxohydroxidetoenhancetheionexchangecapacity.ThemesoporousstructureandthemorphologyofthemesoporousmaterialsobtainedwereconfirmedusingXRDandSEM,respectively.Afluorideionexchangestudywasdoneoneachsample.ResultsshowedthatmesoporousTioxohydroxidecontaining

4、zirconiaexhibitedthehighestfluorideionexchangecapacity,asithasthesmallestparticlesize,withhighuniformityamongthemesoporousmaterialsprepared.Ó2003ElsevierInc.Allrightsreserved.Keywords:Fluoride;Titaniumoxohydroxide;Zirconia;Silica;Ionexchange;Pollution1.Introductionaslime(Ca(OH

5、)2),dolomite(magnesiumsalts),andalum(Al2(SO4)3)havebeenwidelyused[6].Althoughthepre-Fluoride-relatedhealthhazardsareconsideredtobeama-cipitationmethodissimpleandeconomical,therequiredjorenvironmentalprobleminmanyregionsoftheworld[1].dosagesareveryhigh,whichcausessludgedisposa

6、lprob-Thepresenceoffluorideindrinkingwatercanbebeneficiallems.Adsorbentssuchasalumina[7],flyash[8],andcar-ordetrimentaldependingontheconcentration[2].Accord-bon[9]areusedtoadsorbfluoridefromwastewater.How-ingtoWHOstandards,theacceptablelimitoffluorideinever,theadsorptioncapacities

7、ofthesemethodsdecreasepotablewateris1.5mg/l[3].Excessfluorideconsump-sharplyundersalineconditions[10].Ontheotherhand,ittioncausesdentalandskeletalfluorosisproblems.Increas-wasreportedthatCeO2isabletoexchangefluorideionsse-ingpublicconcernregardingexcessivefluoridecontentinlective

8、ly[11].CeO2dispersedintopolymermatrixisacom-drinkingwaterhasledtostr