简介：Inthispaper,benzeneadsorptionisothermandtheirhysteresisontwoimportantlocaldiatomitesweredeterminedat25℃,andtheirsiliconhydroxylgroup(SiOH)numberwasdetermined,theirpropertieswerereported,andtherelationshipbetweensurfacestructure,surfaceSiOHnumberpernm2andadsorptionisothermwithhysteresiswasdiscussed.Thespecificsurfacewasalsocalculatedfromtheisotherms,andpore-sizedistributionwasdetermined.

简介：Naturalsurfacecoatingscollectedfromnaturalsubstances(NSCsNS)wereemployedtostudytherolesofthemainchemicalcomponents(ironoxides,manganeseoxides,andothercomponents)incontrollingtheadsorptionoflead(Pb)andcadmium(Cd)inaquaticenvironments.TheselectivechemicalextractionfollowedbytheadsorptionofPbandCdexperimentsandstatisticalanalysis,wereusedtoinvestigatetheadsorptionpropertyofeachcomponent.Hydroxylaminehydrochloridewasusedtoremovemanganeseoxidesselectively,andsodiumdithionitewasusedtoextractironoxidesandmanganeseoxides.TheresultindicatedthatironoxidesandmanganeseoxidesplayedanimportantroleintheadsorptionofPbandCdonNSCsNS,andtherelativecontributionwasabouttwo-thirds.Thecontributionofmanganeseoxideswasthegreatest,withalesserroleindicatedforothercomponents.TheadsorptionabilityofmanganeseoxidesforPbandCdwasgreaterthanthatofironoxidesorothercomponentsforPbandCd.ThePbadsorptionobservedineachcomponentwasgreaterthanCdadsorption.