Hexavalent chromium adsorption on superparamagnetic multi-wall carbon nanotubes and activated carbon composites

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dc.contributor.authorBayazit, Sahika Sena
dc.contributor.authorKerkez, Ozge
dc.date.accessioned2024-03-13T10:30:58Z
dc.date.available2024-03-13T10:30:58Z
dc.date.issued2014
dc.departmentİstanbul Beykent Üniversitesien_US
dc.description.abstractHexavalent chromium (Cr(VI)) adsorption from aqueous solutions on magnetically modified multi-wall carbon nanotubes (M-MWCNT) and activated carbon (M-AC) was investigated. M-MWCNT and M-AC were prepared by co-precipitation method with Fe2+:Fe3+ salts as precursors. The magnetic adsorbents were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscope (SEM). The effects of amount of adsorbents, contact time, initial pH, temperature and the initial concentration of Cr(VI) solution were determined. The adsorption equilibrium, kinetics, thermodynamics and desorption of Cr(VI) were investigated. Equilibrium data fitted well with the Langmuir isotherm forboth of the adsorbents. The theoretical adsorption capacities are 14.28 mg/g of M-MWCNT and 2.84 mg/g of M-AC. Cr(VI) adsorption kinetics was modeled with pseudo-second order model, intraparticle diffusion model and Bangham model. Thermodynamic parameters were calculated and AG, Ali and AS indicate that the adsorption of Cr(VI) onto M-MWCNT and M-AC was exothermic and spontaneous in nature. Results revealed that M-MWCNT is an easily separated effective adsorbent for Cr(VI) adsorption from aqueous solution. (C) 2014 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.en_US
dc.identifier.doi10.1016/j.cherd.2014.02.007
dc.identifier.endpage2733en_US
dc.identifier.issn0263-8762
dc.identifier.issn1744-3563
dc.identifier.issue11en_US
dc.identifier.scopus2-s2.0-84912533103en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage2725en_US
dc.identifier.urihttps://doi.org/10.1016/j.cherd.2014.02.007
dc.identifier.urihttps://hdl.handle.net/20.500.12662/3629
dc.identifier.volume92en_US
dc.identifier.wosWOS:000345725500065en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherInst Chemical Engineersen_US
dc.relation.ispartofChemical Engineering Research & Designen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectMWCNT/Fe3O4en_US
dc.subjectActivated carbon/Fe3O4en_US
dc.subjectCr(VI)en_US
dc.subjectAdsorptionen_US
dc.titleHexavalent chromium adsorption on superparamagnetic multi-wall carbon nanotubes and activated carbon compositesen_US
dc.typeArticleen_US

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