天然沸石改性及其吸附除氟性能研究.pdf

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3、午琢’虧V后FL日，_口電話(huà)：郵編：AbstractTraceamountoffluorideiSindispensabilitytohumanbutanexeessofintakeoffluorideisharmfultohumanbodyInChina，thepermissiblelimitoffluorideindrinkingwaterisbetween05and10m∥L，andthefluorideremovaltreatm

4、entisnecessarywhenmorethanthestandardAmongsometreatmenttechnologies，adsorptionbecauseofitssimplicityofoperation，costeffectiveness，selectivityhighefficiencyandtheavailabilityofawiderangeofadsorbents，isstilloneofthemostext

5、ensivelyusedmethodsforthefluorideremovalfromwaterZeoliteisakindofnormaladsorberTheadsorptioncapacityofnaturalzeoliteislOWSOitmustbeactivatedinordertOattainahigheradsorptioncapacityOnthiscondition，astudyonmodificationofna

6、turalzeoliteanditsdefluorinationabilitywascarriedoutNaturalzeolitewasmodifiedwithacid，alkali，saltsolution，respectivelyDefluorinati—onabilityofmodifiedzeolitewasstudiedwithadsorptionexperiments，andoptimalmodificationcondi

7、tionwaspresentedAseriesofbatchsorptionexperimentswereconductedtostudytheinfluenceofvariousfactorssuchaspH，adsorbentdose，initialfluorideconcentration，temperature，equilibriumcontacttimeandCOexistinganionsonthesorptionofflu

8、orideAccordingtotheSEM，BETXRFFTIRandXRDanalysis，theadsorptionmechanismofthemodifiedzeoliteswerepreliminarystudiedTheresultsshowedthattheeffectoffluorideremovalofnaturalzeolitemodifiedbyferricchloridehasimprovedsignifican

9、tlyAfterimmersionfor24hwith10％ferricchloridesolutioninl：lratiocantotreatmentthewaterwithfluorideconcentrationof2mg／Lstandardswhentheamountof59／150mlandreactiongtimeis5hTheadsorptionoffluoridewasfollowedpseudo—secondorder

10、kineticsTheadsorptionrateincreasedwiththetemperatureincreasedfirstandthendecreasedIntherawwaterfluorideconcentrationislessthan20mg／g，theequilibriumadsorptiondatafiredwelltoLangmuiradsorptionisothermandshowingmaximumfluor

11、ideadsorptioncapacityofO091mg／gcomparedtotheunmodifiedzeoliteisgreatlyimprovedandequilibriumconstantofO28L／mgAtlowconcentrationsoffluoride，thehigherthetemperature，thehigherthesaturatedadsorptioncapacityIntherawwaterfluor

12、ideconcentrationismorethan20mg／g，theequilibriumadsorptiondatafittedwelltoFreundlichadsorptionisothermWhenthedosageof89，theadsorptioncapacityisthelargestIntherangeofdrinkingwater，pHhaslittleinfluencetoflurideremovaleffect