Uranium extraction from aqueous solution using dried and pyrolyzed tea and coffee wastes

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dc.contributor.authorAly, Zen_AU
dc.contributor.authorLuca, Ven_AU
dc.date.accessioned2015-12-28T02:12:40Zen_AU
dc.date.available2015-12-28T02:12:40Zen_AU
dc.date.issued2013-02-01en_AU
dc.date.statistics2015-09-11en_AU
dc.description.abstractThe adsorption of U(VI) onto dried and pyrolyzed tea and coffee wastes was investigated. The adsorption properties of the materials were characterized by measuring uranium uptake as a function of solution pH, kinetics and adsorption isotherms. pH profile of uranium adsorption where UO2 2+ is expected to be the predominant species was measured between pH 0 and 4. Both Langmuir and Freundlich adsorption models were used to describe adsorption equilibria, and corresponding constants evaluated. Using the Langmuir model, the maximum adsorption capacity of uranium by dried tea and coffee wastes was 59.5 and 34.8 mg/g, respectively at 291 K. Adsorption thermodynamic constants, ΔH° ΔS° and ΔG° were also calculated from adsorption data obtained at three different temperatures. Adsorption thermodynamics of uranyl ions on dried tea and coffee systems indicated spontaneous and endothermic processes. Additionally, a Lagergren pseudo-second-order kinetic model was used to fit the kinetic experimental data for both adsorbents and the constants evaluated. Dried tea and coffee wastes proved to be effective adsorbents with high capacities and significant advantage of a very low cost.© 2012, Akadémiai Kiadó, Budapest, Hungary.en_AU
dc.identifier.citationAly, Z., & Luca, V. (2013). Uranium extraction from aqueous solution using dried and pyrolyzed tea and coffee wastes. Journal of Radioanalytical and Nuclear Chemistry, 295(2), 889-900. doi:10.1007/s10967-012-1851-6en_AU
dc.identifier.govdoc6064en_AU
dc.identifier.issn0236-5731en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleJournal of Radioanalytical and Nuclear Chemistryen_AU
dc.identifier.pagination889-900en_AU
dc.identifier.urihttp://dx.doi.org/10.1007/s10967-012-1851-6en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6496en_AU
dc.identifier.volume295en_AU
dc.language.isoenen_AU
dc.publisherSpringer Netherlandsen_AU
dc.subjectLinear absorption modelsen_AU
dc.subjectUraniumen_AU
dc.subjectKineticsen_AU
dc.subjectpH valueen_AU
dc.subjectThermodynamicsen_AU
dc.subjectAdsorbentsen_AU
dc.titleUranium extraction from aqueous solution using dried and pyrolyzed tea and coffee wastesen_AU
dc.typeJournal Articleen_AU
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