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Adsorption

By Herbert Myers,2014-06-20 03:44
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Adsorption

    Adsorption

    56IMP&HIRFIAnnualReport2006

    2--20AdsorptionBehaviorofAmandEuonSilicon

    DioxideinNitricAcidSolution

    MaJian,DingHuajieandQinZhi

    Theadsorptionbehaviorof.Amand52,Euonsilicondioxideinnitricacidsolutionwasstudiedby

    usingthebatchexperiment.

    The.Amand152.Euadsorptionbatchexperimentswerecarriedoutinsealedpolypropylenetest

    tubes.6mlde

    ionizedwater,1mlKNO3(1M),1.0gsilicondioxide,1mlAm(NO3)3andEu(NO3)3SO

    lution.ThepHofthesolutionwasadiustedbyaddingKOHandHNO3stocksolutions.Foralladsorption

    reactions,theionstrengthofthesolutionwaskeptat0.0125MKNO3andthesolid

    liquidratioat125

    g/1.Whentheadsorptionequilibriumwasachieved,thefinalpHofthesolutionwasthenmeasured.After

    centrifugation,partsofthesupernatantsolutionwasremovedandmeasured.Theadsorptionrates(Kd)

    werecalculatedbasedontheradioactivityofAmandEuinthesolutionbeforeandafteradsorptionreac

    t1Ons

    K一×

    where10andItdenotetheradioactivityofAmandEuinthesolutionbeforeandafteradsorptionreactions

    respectively.

    Fig.1showsthattheadsorptionequilibriumwasachievedwithin10h. Ol0l52O25

    Time(h)

    Fig.1Adsorptionratioversusequilibriumtime.Fig.2AdsorptionratioversuspHofthesolution.

    Theadsorptionratioof241Amand'..EuonSiO,asafunctionofpHareshowninFig.2.Thead

    sorptionratioof.Amand..'EuwerelOWatpH<4,andincreasedsharplyatpH?

    6.Wethinkthat

    theadsorptionofAmandEuonsilicondioxideinnitricacidsolutionbelongstOcationexchangepro

    gressL.Am.andEu'.exchangewithHwhichdissociatefromOH

    onthesurfaceofsilicondioxide.

    WhenpH<6,littleH

    iSdissociatedandtheadsorptionratioiSlOW.CorrespondinglywhenpH>6,the adsorptionratioincreases.AfterpH>8,theconcentrationofHisverylOWandthereactionequilibrium

    Wasachieved.

    Reference

    _jCuiYuguo,LinCansheng,YeGuoan,JournalofNuclearandRadiochemistry.0253

    9950(2003)0l一?l4O4

    一一0_II10dJ0??

    一一0_Ic0dJ0??

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