简介：Anewmethodforthefabricationofcarbonaerogelsisreportedinthispaper.Resorcinolandfurfuralweregelatedinisopropanolwithbasiccatalystsandthendrieddirectlyunderisopropanolsupercriticalcondition,followedbycarbonizationundernitrogenatmosphere.Thebulkdensitiesofcarbonaerogelsobtainedareintherangeof0.21g/cm3～0.27g/cm3andthesizesoftheinterconnectedcarbonnano-particlesareintherangeof20nm～30nm.AlloftheaerogelsamplesexhibithighBETsurfaceareasintherangeof730m2/g～900m2/g.Thebulkdensity,micro-porevolume,meso-porevolumeandmeso-porediametercanbecontrolledbygelationconditionssuchasR/IratioandR/Cratio.

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简介：Studiedtheeffectofionicstrengthontheuptakeoftaurineonastrong-basicanionexchangeresin.ThebatchphaseequilibriumexperimentsoftaurineontheanionexchangeresinD290wereconductedatdifferentionicstrength,andthentheamountsofuptakeoftaurineontheresinatdifferentpHweredetermined.TheionexchangemechanismsoftaurineontheanionexchangeresinatdifferentpHwerediscussed.Experimentalresultsshowedthatwithincreaseoftheionicstrengthofsolution,theadsorbedamountoftaurineontheresinD290decreased;AddingsmallamountsofNaOHorHClintothesystemoftaurineaqueoussolution/D290anionresinwouldmaketheamountoftaurinetakenupontheresintodecreaseduetothecompetitionuptakesofhydroxylionwithtaurineorthedecreaseintheamountofabsorbablezwitterionsoftaurineinthesolutionandexcludingthecationsoftaurinefromtheanionresin.

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简介：Amovingboundarymodelunderconsideringthevolumechangeofsphericalresinbeadsduringionexchangeprocesseswasemployedtorecognizethemechanismsofreecoveringuraniumfromcarbonatesolutionsusingstronglybasicanionexchanger.Twoimportantfactors,swellingandionexchange,whichdirectlyaffecttheviolumeofionexchangersweretakenintoaccount.AnionexchangemechanismhasbeenfoundfortheforwardreactionPCl/[UO2(CO3)3]^4-,andisparticaldiffusiongoverningathighconcentrationofthecomplexanion.ThemechanismofRCl/U(VI)atpH5.5-7.5isachemicalreactiontakingplaceatthemovingboundaryoftheunreactednucleus.ForthereversereactionRnU/NaCl,theuranyltricarbonatecomplexanionintheresinphaseisreplacedbyCl^-ionswithanionexchangemechanismalwaydeterminedbyparticlediffusion.TheotherformsofuraniuminthesolidphaseloadedontheresinatpH5.5-7.5shouldbelongtonon-exchangeableuranium.ThemechanismofthereversereactionRnU/HClisalwayschemicalreactionwhichisnotrestrictedtothemovingboundaryoftheunreactedcore.

简介：ItwasgenerallyconsideredthatcontaminationofthegeltypepolystyrenestrongbasicanionexchangeresinbyorganicmatterinnaturalwateristheresultofionexchangeandVanderwaal′sadsorptiononit.Onthebasisoflaboratoryandindustrialexperiments,thispaperconfirmedthattheinterreactionbetweenorganicmatterandresinpolymermatrixisprimarilycontroledbyaVanderwaal′sadsorption.