WSTA 15th Gulf Water Conference

WSTA 15th Gulf Water Conference
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Treatment of a low concentration of uranium solution with marl treated by heat at different temperatures

Mourad Bellaloui, Nadia Guettai, Messaoud Bennemla, Siham Khemaissia

https://doi.org/10.5004/ic202412

Treatment of a low concentration of uranium solution with marl treated by heat at different temperatures

Mourad Bellaloui1, Nadia Guettai2, Messaoud Bennemla1, Siham Khemaissia1

1Nuclear Research Center of Draria, Algiers, Algeria
2University of Sciences and Technology Houari Boumediene, Algiers, Algeria

https://doi.org/10.5004/ic202412

ABSTRACT

In this study, a heat treatment was applied to a sample of marl in order to improve its ability to adsorb uranium. The morphological and textural properties of raw marl and marl treated at 200°C and 400°C were studied using various characterization techniques: XRF, FTIR and N2-adsorption analysis. XRF shows that the main compounds are silica, calcium, aluminum, iron and potassium. N2-adsorption analysis revealed that the mesoporous character predominates, with a specific surface area of 17.55 m2 g–1 for MPM200 and 17.88 m2 g–1 for MPM400. The heat treatment did not affect the grain size, however, the band corresponding to the bending vibrations of the OH groups belonging to H2O in the IR spectra of MPM-400 disappeared with the influence of temperature. The adsorption capacity of uranium by marl is 3.5 mg g–1 for MPM-200 and 2.8 mg g–1 for MPM-400, obtained after 60 min with 80 mg of adsorbent and 10 mg L–1 of initial concentration at pH = 2. The kinetics follow the pseudo-second-order model and the diffusion process is controlled simultaneously by intraparticle diffusion and liquid film diffusion. The best isotherm correlation for MPM-200 is Freundlish and for MPM-400 is Freundlish and Sips. The thermodynamic study revealed that the uranium adsorption process is thermodynamically feasible, spontaneous, endothermic, with the existence of a slight order

Keywords: Adsorption; Marl; Heat treatment; Uranium; Isotherms

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