Factors influencing the removal of fluoride from aqueous solution by

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1、JournalofHazardousMaterialsB133(2006)119128FactorsinfluencingtheremovaloffluoridefromaqueoussolutionbycalcinedMgAlCO3layereddoublehydroxidesLiangLva,b,JingHea,MinWeia,D.G.Evansa,XueDuana,∗aKeyLaboratoryofScienceandTechnologyofControllableChemicalReactions,Mini

2、stryofEducation,BeijingUniversityofChemicalTechnology,Box98,15BeiSanHuanDongLu,ChaoYangDistrict,Beijing100029,ChinabTheWestBranchofZhejiangUniversityofTechnology,Zhejiang324006,ChinaReceived11April2005;receivedinrevisedform6August2005;accepted3October2005Ava

3、ilableonline15December2005AbstractLayereddoublehydroxides(LDH)calcinedatdifferenttemperatures(denotedasCLDH)havebeendemonstratedtorecovertheiroriginallayeredstructureinthepresenceofappropriateanions.Inthelightofthisso-calledmemoryeffect,astudyofremovaloffluor

4、idefromaqueoussolutionbycalcinedMgAlCO-LDHhasbeencarriedout.TheLDHcalcinedat500◦Chadthehighestcapacityofremovaloffluorideion,3becauseofretentionofitsintrinsicstructure.TheCLDHwithanMg/Alratioof2hasaremarkableabilitytoadsorbanions.Theadsorptionloadingishigherf

5、orthecalcinedMgAl-LDHthanforcalcinedZnAlandNiAl-LDH.Theinfluenceofvaryingtheconditionsforremovaloffluoride,suchasthepHofaqueoussolution,theinitialfluorideconcentration,thedosageofadsorbent,andtemperatureonremovaloffluoridehavebeeninvestigated.Theinfluenceofco-exi

6、stinganionsinfluorideaqueoussolutionindicatesthatthepercentageofremovaloffluorideincreasedinorderPO3−

7、rideionsbytheCLDHmaterialwas98%orhigher.Theresidualfluorideconcentrationwasfoundtobe0.4mg/Lwithaninitialconcentrationof20mg/L,whichmeetsthenationalstandardfordrinkingwaterquality.TheFreundlichisothermandLangmuirisothermwereusedtofitthedataofequilibriumexperime

8、nts.TheresultsofX-raydiffraction,FT-IRandTG-MSdemonstratethattheadsorptionphenomenonisaccompaniedbyrehydrationwithconcomitantuptakeoffluorideionstorebuildtheinitiallayeredstructure.©2005ElsevierB