Journal
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
Volume 93, Issue 3, Pages 127-143Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2006.12.003
Keywords
manganese oxide coated zeolite (MOCZ); uranium(VI); adsorption; equilibrium; thennodynarnic parameters
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This paper discusses the adsorption properties for uranium(VI) by manganese oxide coated zeolite (MOCZ). The removal of uranium(VI) from aqueous solution by adsorption onto MOCZ in a single-component system with various contact times, pH, competitive ions, temperatures and initial concentrations of uranium(VI) was investigated. The experimental results were fitted to the Laugmuir, Freundlich and the three-parameter Redlich-Peterson model isotherms to obtain the characteristic parameters of each model. Both the Langmuir and Redlich-Peterson isotherms were found to best represent the measured adsorption data. According to the evaluation using the Langmuir equation, the maximum adsorption capacity of uranium(VI) ions onto MOCZ was 15.1 mg g(-1) at 293 K and PH 4.0. Using the thermodynamic equilibrium constants obtained at different temperatures, various thermodynamic parameters, such as Delta G(0), Delta H-0 and Delta S-0, have been calculated. The thermodynamics of uranium(VI) ion/MOCZ system indicates the spontaneous and endothermic nature of the process. It was noted that an increase in temperature resulted in a higher uranium loading per unit weight of the adsorbent. (c) 2006 Elsevier Ltd. All rights reserved.
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