新型棉纤维基吸附剂的制备及其性能分析-preparation and performance analysis of a new cotton fiber-based adsorbent.docxVIP

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新型棉纤维基吸附剂的制备及其性能分析-preparation and performance analysis of a new cotton fiber-based adsorbent.docx

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新型棉纤维基吸附剂的制备及其性能分析-preparation and performance analysis of a new cotton fiber-based adsorbent

AbstractPreparationandadsorptionpropertiesofnewtypecottonfiberbased-adsorbentsPreparationandadsorptionpropertiesofnewtypecottonfiberbased-adsorbentsAbstractFacingtheincreasinglyseriouswaterpollutionsituation,peoplebegintofocusonandlookforwaystothegovernanceapproachofwaterpollution.Withadvantageoflowproductioncost,richsource,aswellasgoodremovalefficiency,bioadsorptionmethodhasgiverisetomorewidespreadattentionandapplicationgradually.Inthispaper,akindofadsorbentwaspreparedbygraftingβ-cyclodextrinandamino-terminatedhyperbranchedpolymerafterthealkalizationcottonfiberthroughepoxychloropropaneepoxidationandsodiumperiodateoxidation.AndoptimizedthetechniqueinthepreparationprocessofNaIO4oxidationandHBP-NH2grafting.WecharacterizeandanalyzetheadsorbentbyFT-IRandSEM.Theresultsshowthatthemoleculeofcottonfiber-basedadsorbentcontainsalargegroupofamino,hydroxyandhydrophobiccavityandotheractivesites.Theycanremoveheavymetalionsordyesbyformcoordinationandinclusion.Fromthedatasofadsorptionexperimentsforheavymetals(Pb2+,Ag+,Cu2+)anddye(Congoredandmethyleneblue)，itshowthatthecottonfiberbasedadsorbentsarecomparedtothecottonfiberhashigheradsorptioncapacity,ThemaximumadsorptioncapacitiesofcottonfiberbasedadsorbentforPb2+、Ag+、Cu2+were78.7mg/g,43.8mg/gand27.5mg/g,whichwere7～22timeslargerthanthatofcottonfiber.Incompetitionsystem,themutualinfluencebetweenheavymetalionsledstothedecreaseoftheadsorptioncapacityofdifferentdegree.AndthemaximumadsorptioncapacitiesofCongoredandmethylenebluewas300.8mg/gand71.4mg/g，whichwere5～20timeslargerthanthatofcottonfiber.Thispaperalsostudytheinfluenceofadsorbentdosage、pHofsolution、adsorptiontime、initialconcentrationontheCottonfiber-basedadsorbenteffectsofheavymetalionsanddyes.Weusedynamicsandisothermmodeltofittheexperimentaldatas.Theresultsshowthat,thepseudo-second-orderkineticsmodelcanfittheeffectofheavymetalsandPreparationandadsorptionpropertiesofnewtypecottonfiberbased-adsorbentsAbstractdyeswell.TheadsorptionprocessofheavymetalionscanuseLangmuiradsorptionisother