cuⅱ印迹纳米纤维膜的制备及选择性吸附行为分析word格式论文.docxVIP

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cuⅱ印迹纳米纤维膜的制备及选择性吸附行为分析word格式论文.docx

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cuⅱ印迹纳米纤维膜的制备及选择性吸附行为分析word格式论文

ABSTRACTWiththedevelopmentofPCBindustry,copperionpollutionproblemsbecome moreandmoreserious.Therefore,itisimportanttodevelopafastandefficient technologyfortreatmentofcopperpollutedwater,andachievereuseorrecyclingof copperresources.Themetalion-imprintedpolymerisakindofadsorbentwithhigh selectivityandadsorptioncapacity,whichisahottopicinheavymetalpollution control.Inthisstudy,nanofiberswerepreparedbyelectrospinning.Subsequently,the nanofiberswerecrosslinkedandtheCu(Ⅱ)-imprintednanofiberswereobtainedafterCu2+templateionswereelutedwithHCl.Theirperformanceswereinvestigatedandthe mainlyresults were given as follows:ThemainlyingredientsofCu2+wasintheformofcomplexeswithL-Histidinein electrospinning solutions at pH=4.5, when themolarity ratio of copper ion to L-Histidinewas kept at 1:2.2.ThediameterofPVA/Cu(Ⅱ)-L-histidinenanofiberswas290±102nm,whentheoptimizedconditionsofsolutionconcentration13wt%,voltage26kV,workingdistance 7cm, flowing rate 0.4ml/h were applied.Cu(Ⅱ)-imprinted nanofibers with diameter of 480±91nm were harvestedthrough crosslinked with glutaraldehyde vapor for 24h at room temperature and epichlorohydrin for3h,and eluted templateions of coppersubsequently.ThemaximumadsorptioncapacityofCu(Ⅱ)-imprintednanofibersforCu2+atinitial concentration of100mg/Lwas 41.6mg/gatpH=6.TheadsorptiondynamicsofCu(Ⅱ)-imprintednanofibersfor Cu2+obeyed pseudo-second-ordermodel,andkineticstudiesshowedthatadsorptionequilibrium timewaswithin40minuteandtheequilibriumadsorptioncapacitywas32.68mg/g when initial concentrationof copper ion solutionwas 100mg/Lat pH 4.5.TheadsorptioncapacityofCu(Ⅱ)-imprintednanofibersincreased withtheinitial concentration of copper ion solution,the adsorption was typical chemical adsorptionandtheisothermaladsorptiondatasfittedwellwithLangmiurequation.TheadsorptioncapacityofCu(Ⅱ)-imprintednanofibersincreasedwhentemperaturewaselevated, which indicatedthat the adsorption processwas endothermic.Insimulatedbinarymetalionsolutions,theselectivityof Cu(Ⅱ)-imprintedn