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AdsorptionofCu2+ onCross-linkedAcylatedChitosanMicrospheres

ZHANGRunhu,NINGMencui,LILib   

  1. a.FacultyofChemicalEngineering;b.FacultyofEnvironmentalEngineering,KunmingMetallurgyCollege,Kunming650033,China
  • Received:2018-11-01 Online:2019-02-28 Published:2019-02-28

Abstract: Inthispaper,chitosanwith95% degreeofdeacetylationwasusedasrawmaterial,andthechitosanwasmodifiedbyacylationofsuccinicanhydrideandcrosslinkingofcalciumchloridetoprepareanacylatedchitosancrosslinkedmicrospherewithbetteradsorptionperformanceandbetterstability.TheadsorptionpropertiesofacylatedchitosancrosslinkedmicrospheresforCu2+ werealsoinvestigated.Theexperimentalresultsshowthattheacylatedchitosancrosslinkedmicrosphereshavegoodadsorptionpropertiesforcopperions.Theoptimalconditionsforadsorptionare:theadsorptiontimeofthemicrospherestocopperionsis60minandthepHis6.0.Duringtheadsorptionprocess,theΔGθvalueisbetween13.58kJ·mol-1and11.28kJ·mol-1,ΔHθ=11.61kJ·mol-1,ΔS=76.82J·K-1·mol-1,indicatingthattheacylatedchitosanmicroCu2+ adsorptioninballadsorptionwaterisaspontaneousendothermicandentropicprocess.

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Key words: cross-linkedacylatedchitosanmicrospheres, adsorption, Cu2+ ions, thermodynamicparameter

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