Solid phase extraction of uranium from phosphoric acid: kinetic and thermodynamic study
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Ahmed Fawzy Abdel-Magied
Abstract
There is a high interest to develop suitable solid phase extractants for uranium separation from aqueous solutions in order to reduce cost and enhance the efficiency. This paper describes solid phase extraction of uranium(VI) from aqueous phosphoric acid solution using MCM-41 based D2HEPA-TOPO organophosphorous extractants. The mixture of D2HEPA (di-2-ethyl-hexylphosphoric acid) and TOPO (tri-n-octylphosphine oxide) was impregnated into the pores of MCM-41 and the synthesized sorbent was fully characterized. The influences of different factors such as synergistic mixture ratio, phosphoric acid concentration, mixing time and temperature were investigated. The results showed that 90% of uranium(VI) extraction can be achieved within 5 min, using D2HEPA-TOPO@MCM-41 (mass ratio 2:1 w/w) from 1 M phosphoric acid containing 64 ppm of uranium at room temperature. High adsorption capacity of uranium(VI) have been achieved at the mentioned conditions. The rate constant for the chemical adsorption of uranium(VI) was 0.988 g mg‒1 min‒1 calculated by the pseudo-second order rate equation. The obtained thermodynamics parameters showed that uranium(VI) adsorption from H3PO4 is an exothermic and spontaneous process.
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©2017 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Activation cross section and isomeric cross-section ratio for the (n,2n) reaction on 132,134Ba
- Measurement of photo-neutron cross sections and isomeric yield ratios in the 89Y(γ,xn)89−x Y reactions at the bremsstrahlung end-point energies of 65, 70 and 75 MeV
- Production, separation and target preparation of 171Tm and 147Pm for neutron cross section measurements
- Solid phase extraction of uranium from phosphoric acid: kinetic and thermodynamic study
- Natural silica sand modified by calcium oxide as a new adsorbent for uranyl ions removal from aqueous solutions
- Radiochemical separation of 231Pa from siliceous cake prior to its determination by gamma ray spectrometry
- Investigation of selenium compounds as targets for 76,77Br production using protons of energies up to 34 MeV
- Attenuation properties of radiation shielding materials such as granite and marble against γ-ray energies between 80 and 1350 keV
- Controlled release fertilizers using superabsorbent hydrogel prepared by gamma radiation
Artikel in diesem Heft
- Frontmatter
- Activation cross section and isomeric cross-section ratio for the (n,2n) reaction on 132,134Ba
- Measurement of photo-neutron cross sections and isomeric yield ratios in the 89Y(γ,xn)89−x Y reactions at the bremsstrahlung end-point energies of 65, 70 and 75 MeV
- Production, separation and target preparation of 171Tm and 147Pm for neutron cross section measurements
- Solid phase extraction of uranium from phosphoric acid: kinetic and thermodynamic study
- Natural silica sand modified by calcium oxide as a new adsorbent for uranyl ions removal from aqueous solutions
- Radiochemical separation of 231Pa from siliceous cake prior to its determination by gamma ray spectrometry
- Investigation of selenium compounds as targets for 76,77Br production using protons of energies up to 34 MeV
- Attenuation properties of radiation shielding materials such as granite and marble against γ-ray energies between 80 and 1350 keV
- Controlled release fertilizers using superabsorbent hydrogel prepared by gamma radiation
