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Solid phase extraction of uranium from phosphoric acid: kinetic and thermodynamic study
Stockholm University, Faculty of Science, Department of Organic Chemistry. Nuclear Materials Authority, Egypt.ORCID iD: 0000-0002-2819-2062
Number of Authors: 1
2017 (English)In: Radiochimica Acta, ISSN 0033-8230, E-ISSN 2193-3405, Vol. 105, no 10, 813-820 p.Article in journal (Refereed) Published
Abstract [en]

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 D2HEPATOPO@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 H-3 PO4 is an exothermic and spontaneous process.

Place, publisher, year, edition, pages
2017. Vol. 105, no 10, 813-820 p.
Keyword [en]
Uranium, adsorption, solid phase extraction, phosphoric acid
National Category
Chemical Sciences Mechanical Engineering
Identifiers
URN: urn:nbn:se:su:diva-148877DOI: 10.1515/ract-2017-0001ISI: 000412217100004OAI: oai:DiVA.org:su-148877DiVA: diva2:1159200
Available from: 2017-11-22 Created: 2017-11-22 Last updated: 2017-11-22Bibliographically approved

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