荷叶吸附水体中亚甲基蓝和碱性品红的研究

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1、AbstractColorwastewaterdischargedintowatermightcausevariousenvironmentalproblems．Thelowcostbiomassmateriallotusleafwasfirstlyusedasanadsorbentfortheremovalofcationicdyefromaqueoussolution．Thedyesselectedforthepresentstudyweremethyleneblue(MB)andbasicfuchsin(BF)．Thepotentialoflotu

2、sleaffortheremovalofMBandBFfromaqueoussolutionwasinvestigated．Thebatchandfixed—bedcolumnexperimentswerediscussed．Thebatchexperimentswereperformedundervariousconditionsincludingcontacttime，adsorbentdose，initialMBconcentration,solutionpH，saltionicstrengthandtemperature．Thebatchexpe

3、rimentsindicatedthat4hWasseenastheadsorptionequilibriumtimeandadsorbentdoseof1g／LWasfoundtobetheoptimumconcentrationfortheadsorptionofmethyleneblueandbasicfuchsin．ThemaximummonolayeradsorptioncapacityoflotusleafforMBandBFwerefoundtobe221．7mg／gand117．5mg／gat293Krespectively．Theinf

4、luenceofCa2+onremovalofMBandBFwerestrongerthanSa+．Highertemperatureresultedinanincreaseintheamountofdyesadsorbedontolotusleafpowderwithintherangeofexperimentaltemperatures．TheLangmuir,Freundlich,Temkin,Koble—CorriganandRedlich-Petersonisothermmodelswereemployedtodiscusstheadsorpt

5、ionbehavioroflotusleafforMBandBF．TheadsorptionofMBontolotusleaffollowstheLangmuirandTemkinisothermmodelswell．Moreover,theadsorptionofBFontolotusleaffollowsLangmuir，Freundlich，Redlich—Petersonisothermmodelswell．Astemperatureswerewithintherangeof293-313KthethermodynamicparametersAG

6、foradsorptionofMBandBFontolotusleafwere-25．67，一26．57，一27．74kJ／moland-24．28，一25．16，一27．28l【J／mol，respectively．TheresultsindicatedthespontaneousnatureandendothermicnatureoftheadsorptionprocessoflotusleafforMBandBF,andtheincreaseintemperatureWasadvantagetoadsorbMBandBF．Thekineticstu

7、diesforMBandBFadsorbedontolotusleafindicatedthatadsorptionprocessfollowedthepseudosecond—ordermode，suggestingthattheadsorptionmightbechemisorptionprocess，andtheboundarylayerandintraparticlediffusionmaycontrolIlltheadsorptionprocesstosomeextent．Infixed-bedcolumnexperiments，theeffe

8、ctsofflowrate，influentconcentrationandbe