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Formation of AgI/Ag3PO4 solid solution on alumina for enhancing radioactive iodine adsorption at high temperatures

【摘要】Radioiodine-131isoneoftheperniciousradionuclidesreleasedduringnuclearaccidents,asitsradioactivitycanpotentiallyaffectpublichealthandsafety.Topreventradioiodine-131frombeingreleasedintotheenvironment,theuseofadsorbentsthatarehighlyefficientathightemperaturesissignificantlyimportant.Theradioactivegasfromthenuclearcoreinanaccident,suchastheFukushimanuclearaccident,isusuallyreleasedoccursunderhigh-temperatureconditions.Therefore,inthisstudy,a10wt%silverphosphate-loadedalumina(Ag3PO4/Al2O3)adsorbentwasprepared.Further,itsperformancetowardradioiodineadsorptionwastestedathightemperaturesupto750C,usingAl2O3andtraditional10wt%Ag/Al2O3adsorbentascontrols.Theresultsoftheiodineadsorptiontestindicatedthatthe10wt%Ag3PO4/Al2O3adsorbentshowedahigherdecontaminationfactorthandidthe10wt%Ag/Al2O3adsorbentbytwoordersofmagnitudeat650and750C.Resultsoftheiodinedesorptiontestrevealedthatthenewadsorbentcouldbeeffectivelyusedat750C.ThecharacteristicpowderX-raydiffraction,nitrogenadsorption–desorptionisotherm,X-rayphotoelectronspectroscopy,andthermogravimetricanalysis–differentialscanningcalorimetrydataindicatedthattheenhancedadsorptionabilityathightemperatureswasattributedtotheformationofasolidsolutionbetweensilveriodideandAg3PO4.

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