Sorption of americium by detonation synthesis nanodiamonds from aqueous solutions of various compositions

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Resumo

Sorption of americium by commercial samples of detonation nanodiamonds (NDs) from nitric acid, neutral, and alkaline solutions was investigated. Sorption kinetics and dependence of sorption degree on pH, ionic strength, m/V ratio and temperature were studied. Thermodynamic parameters of americium adsorption by NDs were determined for the first time. Conditions of quantitative sorption of americium by NDs samples were found; it was shown that NDs are promising sorbents for decontamination of natural waters from possible americium impurities.

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Sobre autores

А. Kazakov

Vernadsky Institute of Geochemistry and Analytical Chemistry, RAS

Autor responsável pela correspondência
Email: kazakov.ag@geokhi.ru
Rússia, ul. Kosygina 19, Moscow, 119991

D. Pavlova

Vernadsky Institute of Geochemistry and Analytical Chemistry, RAS; Mendeleev Russian University of Chemical Technology

Email: kazakov.ag@geokhi.ru
Rússia, ul. Kosygina 19, Moscow, 119991; Miusskaya pl. 9, Moscow, 125047

S. Vinokurov

Vernadsky Institute of Geochemistry and Analytical Chemistry, RAS

Email: kazakov.ag@geokhi.ru
Rússia, ul. Kosygina 19, Moscow, 119991

B. Myasoedov

Vernadsky Institute of Geochemistry and Analytical Chemistry, RAS; Interdepartmental Center for Analytical Research in Physics, Chemistry, and Biology, RAS

Email: kazakov.ag@geokhi.ru
Rússia, ul. Kosygina 19, Moscow, 119991; Moscow, 117997

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2. Fig. 1. Dependence of the ζ-potential of the surface of TAN and STP aggregates on pH.

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3. Fig. 2. Kinetics of americium sorption in media with pH from 3 to 10 by TAN (a) and STP (b) samples at 25°C; HA content 100 μg/ml.

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4. Fig. 3. Dependence of the degree of americium sorption on pH and salt background at an HA content of 100 μg/ml at 25°C.

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5. Fig. 4. Dependence of the degree of americium sorption at different pH on the NA content at 25°C.

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6. Fig. 5. Effect of temperature on the degree of americium sorption by the TAN sample at pH 6 with different NA contents.

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7. Fig. 6. Approximation of experimental data (points) by the Henry isotherm model (lines) for the sorption of americium by the TAN sample at pH 6.

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