Adsorption-behavior-of-metal–organic-frameworks-for-methylene-blue-from-aqueous-solution

Adsorptionbehaviorofmetal–organicframeworksformethylenebluefromaqueoussolutionShuangLina,ZhilongSonga,GuangboChea,AoRena,PingLia,ChunboLiua,⇑,JishuangZhangb,⇑aSchoolofChemistryandChemicalEngineering,JiangsuUniversity,Zhenjiang212013,ChinabJiangsuKeyLaboratoryofBiomedicalMaterials,CollegeofChemistryandMaterialsScience,NanjingNormalUniversity,Nanjing210046,ChinaarticleinfoArticlehistory:Received10October2013Receivedinrevisedform17February2014Accepted1March2014Availableonline13March2014Keywords:MetalorganicframeworksAdsorptiondyewastewaterCu-BTCKineticmodelLangmuirisothermabstractAmetal–organicframeworks(MOFs)basedoncopper-benzenetricarboxylateswasappliedtotheadsorp-tionofmethyleneblue(MB)fromaqueoussolution.Cu-BTC[BTC=1,3,5-benzenetricarboxylate]alsoknownasHKUST-1isawidelystudiedMOF.Cu-BTCmainlypossessedmesopores,highsurfaceareaandbigporevolumewhichisbenefitfortheadsorptioncapacity.CharacterizationofCu-BTCwereachievedbyXRD,SEMmicrographs,nitrogenadsorption–desorptionanalysisandFT-IRspectra.Thekineticscharacteristicandthermodynamicparameterswerealsoanalyzed.TheexperimentalisothermsdatawereanalyzedusingLangmuirandFreundlichisothermequationsandtheresultsindicatedthattheLangmuirisothermshowedabetterfitforMBadsorption.ThermodynamicparameterswerecalculatedbytheGibbsfreeenergyfunction,confirmingthattheadsorptionprocesswasspontaneousandaccom-paniedbyexothermic.ThemaximumremovalhasbeenachievedatthepH=7.0.Thepossiblemecha-nismandtheadsorptionbehavioroftheadsorptionofMBontoCu-BTCwereinvestigated.TheadsorbentCu-BTCcouldbeeasilyregeneratedafterwashingwithethanol.Theexperimentalresultssug-gestedthatCu-BTCmaterialshavepotentialapplicationforthewastewatertreatmentcontainingMBdye.�2014PublishedbyElsevierInc.1.IntroductionVariouskindsofsyntheticdyesarefoundineffluentwastewa-tersfromavarietyofindustriessuchastextile,leather,plastic,foodprocessing,cosmetics,paper,printing,pharmaceuticalanddyemanufacturing[1].Organicdyesreleasedintotheenvironmenthaveposedasignificantthreattotheenvironment