Removal of uranium(VI) from aqueous solutions using nanoporous ZnO prepared with microwave-assisted combustion synthesis

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dc.contributor.authorKaynar U.H.
dc.contributor.authorAyvacıklı M.
dc.contributor.authorKaynar S.C.
dc.contributor.authorHiçsönmez U.
dc.date.accessioned2024-07-22T08:17:18Z
dc.date.available2024-07-22T08:17:18Z
dc.date.issued2014
dc.description.abstractThe adsorption of the uranyl ions from aqueous solutions on the nanoporous ZnO powders has been investigated under different experimental conditions. The adsorption of uranyl on nanoporous ZnO powders were examined as a function of the contact times, pH of the solution, concentration of uranium(VI) and temperature. The ability of this material to remove U(VI) from aqueous solution was followed by a series of Langmuir and Freunlinch adsorption isotherms. The adsorption percent and distribution coefficient for nanoporous ZnO powders were 98.65 % ± 1.05 and 7,304 mL g -1 , respectively. The optimum conditions were found as at pH 5.0, contact time 1 h, at 1/5 Zn 2+ /urea ratio, 50 ppm U(VI) concentration and 303 K. The monomolecular adsorption capacity of nanoporous ZnO powders for U(VI) was found to be 1,111 mg g -1 at 303 K. Using the thermodynamic equilibrium constants obtained at different temperatures, various thermodynamic parameters, such as ΔG, ΔH and ΔS, have been calculated. Thermodynamic parameters (ΔH = 28.1 kJ mol -1 , ΔS = 160.30 J mol -1 K -1 , ΔG = -48.54 kJ mol -1 ) showed the endothermic and spontaneous of the process. The results suggested that nanoporous ZnO powders was suitable as sorbent material for recovery and adsorption of U(VI) ions from aqueous solutions. © 2014 Akadémiai Kiadó, Budapest, Hungary.
dc.identifier.DOI-ID10.1007/s10967-014-2919-2
dc.identifier.issn02365731
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/17023
dc.language.isoEnglish
dc.publisherKluwer Academic Publishers
dc.subjecturanium
dc.subjectzinc oxide
dc.subjectadsorption kinetics
dc.subjectanalytic method
dc.subjectaqueous solution
dc.subjectarticle
dc.subjectchemical parameters
dc.subjectconcentration (parameters)
dc.subjectcontact time
dc.subjectFreunlinch adsorption isotherm
dc.subjectisotherm
dc.subjectLangmuir adsorption isotherm
dc.subjectmetal recovery
dc.subjectmicrowave assisted combustion synthesis
dc.subjectpH
dc.subjectpowder
dc.subjectthermodynamics
dc.titleRemoval of uranium(VI) from aqueous solutions using nanoporous ZnO prepared with microwave-assisted combustion synthesis
dc.typeArticle

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