Nanostructured Magnetic Sorbents for Selective Recovery of Uranium(VI) from Aqueous Solutions


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Abstract

Direct sol-gel, novel template, and additional high-temperature reduction procedures for preparing iron oxides and their composites, showing promise for selective sorption of dissolved U(VI) from aqueous media of various acidities, are described. The sorption activity of the materials was studied, the kinetic curves of the sorption were obtained, and the efficiency of the selective recovery of U(VI) from aqueous solutions with different pH values using the new sorbents was compared. The probable mechanism of the U(VI) sorption onto the sorbents studied was suggested on the basis of SEM, XPS, emf, and BET data. The quantitative sorption of U(VI) is determined to a greater extent by the composition of the sorbent solid phase, rather then by the specific surface area of the sorbents, which ranges from 0.1 to 47.3 m2 g−1 depending on the synthesis procedure. The crystalline Fe0 phase in the sorbents prepared using additional high-temperature reduction plays the key role in the U(VI) sorption by the reducing deposition mechanism. The saturation magnetization for this type of sorbents can reach 133–140 emu g−1, which is an additional advantage allowing magnetic separation of the spent sorbents from the treated solutions.

About the authors

E. K. Papynov

Institute of Chemistry, Far Eastern Branch; Far Eastern Federal University

Author for correspondence.
Email: papynov@mail.ru
Russian Federation, pr. 1000-letiya Vladivostoka 159, Vladivostok, 690022; ul. Sukhanova 8, Vladivostok, 690920

I. A. Tkachenko

Institute of Chemistry, Far Eastern Branch

Email: papynov@mail.ru
Russian Federation, pr. 1000-letiya Vladivostoka 159, Vladivostok, 690022

V. Yu. Maiorov

Institute of Chemistry, Far Eastern Branch

Email: papynov@mail.ru
Russian Federation, pr. 1000-letiya Vladivostoka 159, Vladivostok, 690022

V. S. Pechnikov

Far Eastern Federal University

Email: papynov@mail.ru
Russian Federation, ul. Sukhanova 8, Vladivostok, 690920

A. N. Fedorets

Far Eastern Federal University

Email: papynov@mail.ru
Russian Federation, ul. Sukhanova 8, Vladivostok, 690920

A. S. Portnyagin

Institute of Chemistry, Far Eastern Branch; Far Eastern Federal University

Email: papynov@mail.ru
Russian Federation, pr. 1000-letiya Vladivostoka 159, Vladivostok, 690022; ul. Sukhanova 8, Vladivostok, 690920

A. N. Dran’kov

Institute of Chemistry, Far Eastern Branch; Far Eastern Federal University

Email: papynov@mail.ru
Russian Federation, pr. 1000-letiya Vladivostoka 159, Vladivostok, 690022; ul. Sukhanova 8, Vladivostok, 690920

I. Yu. Buravlev

Institute of Chemistry, Far Eastern Branch; Far Eastern Federal University

Email: papynov@mail.ru
Russian Federation, pr. 1000-letiya Vladivostoka 159, Vladivostok, 690022; ul. Sukhanova 8, Vladivostok, 690920

A. V. Grishin

Far Eastern Federal University

Email: papynov@mail.ru
Russian Federation, ul. Sukhanova 8, Vladivostok, 690920

I. G. Tananaev

Institute of Chemistry, Far Eastern Branch; Far Eastern Federal University; Frumkin Institute of Physical Chemistry and Electrochemistry

Email: papynov@mail.ru
Russian Federation, pr. 1000-letiya Vladivostoka 159, Vladivostok, 690022; ul. Sukhanova 8, Vladivostok, 690920; Leninskii pr. 31, korp. 4, Moscow, 119991

V. A. Avramenko

Institute of Chemistry, Far Eastern Branch; Far Eastern Federal University

Email: papynov@mail.ru
Russian Federation, pr. 1000-letiya Vladivostoka 159, Vladivostok, 690022; ul. Sukhanova 8, Vladivostok, 690920

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