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Evaluation of sorption of uranium onto metakaolin using X-ray photoelectron and Raman spectroscopies
Authors:Jamil R. Memon  Keith R. Hallam  Adel El-Turki
Affiliation:a National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, Sindh 76080, Pakistan
b Interface Analysis Centre, University of Bristol, 121 St. Michael's Hill, Bristol BS2 8BS, UK
Abstract:
Metakaolin prepared from a natural clay mineral ore of aluminium kaolinite is a promising low cost and high activity aluminosilicate material that has been investigated for studying the sorption behavior of uranium. Here, metakaolin was characterized using X-ray photoelectron spectroscopy (XPS) and the effects of pH, contact time and initial metal ion concentration on its sorption behavior were studied. The sorption process was found to initially be rapid (∼60% at time 0 min) but became slower with time; equilibrium was established within 24 h (∼80% sorption). The data were applied to study the kinetics of the sorption process. The Langmuir and Dubinin-Radushkevich (D-R) sorption isotherms were used to describe partitioning behavior for the system at room temperature. The binding of metal ions was found to be pH dependent, with optimal sorption occurring at pH 5. The retained metal ions were eluted with 5 mL of 0.1 M HNO3. Raman spectroscopy and XPS were used to evaluate the sorption mechanism of U(VI).
Keywords:Metakaolin   Uranium   Sorption   Kinetics   Isotherms
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