XAFS study of starch-stabilized magnetite nanoparticles and surface speciation of arsenate

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• XAFS study of starch-stabilized magnetite nanoparticles and surface speciation of arsenate

  Ithasbeenshownthatstarchcaneffectivelystabilizenanoscalemagnetiteparticles,andstarch-stabilizedmagnetitenanoparticles(SMNP)arepromisingforinsituremediationofarsenic-contaminatedsoils.However,amolecularlevelunderstandinghasbeenlacking.Here,wecarriedoutXAFSstudiestobridgethisknowledgegap.FeK-edgeXAFSspectraindicatedthattheFeeOandFeeFecoordinationnumbersofSMNPwerelowerthanthoseforbaremagnetiteparticles,andthesecoordinationnumbersdecreasedwithincreasingstarchconcentration.Thedecreaseintheaveragecoordinationnumberatelevatedstabilizerconcentrationwasattributedtotheincreaseinthesurface-to-volumeratio.ArsenicK-edgeXAFSspectraindicatedthatadsorbedarsenateonSMNPconsistedprimarilyofbinuclearbidentate(BB)complexesandmonodentatemononuclear(MM)complexes.MoreBBcomplexes(energeticallymorefavorable)wereobservedathigherstarchconcentrations,indicatingthatSMNPnotonlyofferedgreateradsorptionsurfacearea,butalsostrongeradsorptionaffinitytowardarsenate.[详细]

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