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Kinetics and Isotherms for Uranium (VI) Adsorption from Aqueous Solutions by Goethite
Current Issue
Volume 3, 2016
Issue 2 (April)
Pages: 6-12   |   Vol. 3, No. 2, April 2016   |   Follow on         
Paper in PDF Downloads: 94   Since Jul. 8, 2016 Views: 1753   Since Jul. 8, 2016
Authors
[1]
Salah Chegrouche, Algerian Atomic Energy Commission, Nuclear Research Centre of Draria, BP 43 Draria, Algiers, Algeria.
[2]
Abdelhamid Mellah, Algerian Atomic Energy Commission, Nuclear Research Centre of Draria, BP 43 Draria, Algiers, Algeria.
[3]
Mahfoud Barkat, Algerian Atomic Energy Commission, Nuclear Research Centre of Draria, BP 43 Draria, Algiers, Algeria.
[4]
Abderahmane Aknoun, Algerian Atomic Energy Commission, Nuclear Research Centre of Draria, BP 43 Draria, Algiers, Algeria.
Abstract
The objective of this study was to investigate the ability of a synthetic goethite to remove U(VI) from aqueous solutions. Goethite (α-FeOOH), which has a strong adsorption affinity for the uranyl ion (UO22+), was synthesized in our laboratory by Atkinson et al., method [1] and used as adsorbent. Characterization of this adsorbent proved crucial. Thus, several analytical techniques and characterization were used, including: X-ray diffraction XRD, Infrared spectroscopyIR and Thermogravimetry TG. Equilibrium isotherm studies were used to evaluate the maximum sorption capacity of goethite and the experimental results showed this to be 66.66 mg/g. The parameters that affect the uranium(VI) adsorption, such as shaking time, solution pH, and temperature, have also been investigated and optimized (shaking time 180 min, pH 6.0 and temperature 50°C). Equilibrium isotherm studies were used to evaluate the maximum sorption capacity of goethite and experimental results showed this to be 66.66 mg/g. The Freundlich, Langmuir, and Dubinin–Radushkevich (D–R) models have been applied and the data correlate well with Langmuir model and that the sorption is physical in nature (the activation energy Ea = 6.189 kJ/mol). The obtained optimal parameters were applied to real effluents containing uranium (VI). The findings show that the uranium (VI) removal percentage was 65.25%.
Keywords
Adsorption, Goethite, Uranium, Langmuir Model, Freundlich Model, Dubinin–Radushkevich Model
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