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dc.creatorJovanović, Mina
dc.creatorArcon, Iztok
dc.creatorKovač, Janez
dc.creatorNovak-Tusar, Nataša
dc.creatorObradović, Bojana
dc.creatorRajić, Nevenka
dc.date.accessioned2021-03-10T13:14:23Z
dc.date.available2021-03-10T13:14:23Z
dc.date.issued2016
dc.identifier.issn1387-1811
dc.identifier.urihttp://TechnoRep.tmf.bg.ac.rs/handle/123456789/3440
dc.description.abstractIn this study the uptake capacity of Mn(II) ions by zeolite A beads was investigated for different initial Mn concentration (100-400 mg Mn dm(-3)) in batch mode at 25-55 degrees C. The obtained adsorption capacity varying from 30 to 50 mg Mn g(-1) demonstrated a high affinity of zeolite A towards Mn(II) present in solutions. Kinetic studies indicated the intra-particle diffusion as the rate limiting step up to 45 degrees C with apparent diffusivities in the range (1.2-2.0) x 10(-13) m(2) s(-1) and the activation energy of 21.9 kJ mol(-1), which implies strong interactions between the zeolite A and Mn ions. At 55 degrees C ion-exchange became the rate limiting step. The adsorption isotherms were studied at 25 degrees C showing that the Mn adsorption is the best described by the Langmuir model suggesting a homogenous zeolite surface. XPS analysis of the Mn-loaded beads showed that there is no surface accumulation of Mn but an almost uniform Mn distribution inside zeolite A, whereas XANES and EXAFS suggested that the adsorption of Mn(II) was followed by the Mn(II) oxidation and oxide formation. Regeneration of the spent zeolite was examined in 8 adsorption/desorption cycles by a chelating Na(2)EDTA in a fluidized column. It has been found that zeolite A beads could be reused for at least 4 cycles with satisfactory Mn(II) adsorption efficiencies of about 70%.en
dc.publisherElsevier Science Bv, Amsterdam
dc.relationSlovenia-Serbia bilateral project [BI-RS/12-13-029]
dc.relationbeamline XAFS [20115112]
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45019/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172018/RS//
dc.rightsrestrictedAccess
dc.sourceMicroporous and Mesoporous Materials
dc.subjectZeolite Aen
dc.subjectManganeseen
dc.subjectAdsorption kineticsen
dc.subjectEXAFS/XANESen
dc.subjectXPSen
dc.titleRemoval of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbenten
dc.typearticle
dc.rights.licenseARR
dc.citation.epage385
dc.citation.other226: 378-385
dc.citation.rankM21
dc.citation.spage378
dc.citation.volume226
dc.identifier.doi10.1016/j.micromeso.2016.02.026
dc.identifier.scopus2-s2.0-84959150354
dc.identifier.wos000373419400045
dc.type.versionpublishedVersion


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Приказ основних података о документу