S.Haoetal./ColloidsandSurfacesA:Physicochem.Eng.Aspects444 (2014) 104–113

113

accountuniquenessoftheinteractionbetweenanadsorbateandaparticularadsorbent.Although,Schwarz’smethodaccountsforadsorbate-adsorbateandadsorbate-adsorbentinteractions,theadsorptiondatafailedtobereducedtotemperatureindependentplots.

Amodi edprocedureofdeterminingthevalueofparameter,k,inSchwarz’sequation,i.e.Eq.(10)wasproposed.Whenthisnewprocedurewasappliedtoanalyzethelaboratoryadsorptiondata,theadsorptiondatacanbereducedtosingletemperatureinvariantcharacteristiccurvesforthecoals.

Theformofcharacteristiccurvecouldin uenceD–ingcubicpolynomialascharacteristiccurveformcouldresultinanabnormalprediction.Thatistosaytheadsorptionamountwouldincreasewiththepressuredropping.AnewformofcharacteristiccurvededucedfromD–Aequationwasproposed.ThepredictionuncertaintyofD–Aequationbyusingthischarac-teristiccurveformislessthanthatforusingcubicpolynomialascharacteristiccurveform.

Acknowledgements

ThisworkwassupportedbytheNationalBasicResearchPro-gramofChina(973Program,No.2011CB201202)andtheNationalNaturalScienceFoundationofChina(20776089).

TheauthorsalsothankJingjieLuo,WenjingSun,NingWangandYanyanFengfortheirhelpfuldiscussions.

AppendixA.Supplementarydata

Supplementarydataassociatedwiththisarticlecanbefound,intheonlineversion,at/10.1016/j.colsurfa.2013.12.047.

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