Startseite Efficient decontamination of naturally occurring radionuclide from aqueous carbonate solutions by ion flotation process
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Efficient decontamination of naturally occurring radionuclide from aqueous carbonate solutions by ion flotation process

  • Mamdoh R. Mahmoud EMAIL logo und Sameh H. Othman
Veröffentlicht/Copyright: 1. Februar 2018

Abstract

The present study evaluates the performance of ion flotation process for removal of uranyl tricarbonate complex, UO2(CO3)34−, which is the dominant species in many aqueous media particularly seawater, from aqueous solutions using cetyltrimethylammonium bromide, CTAB, as a cationic surfactant. Flotation of UO2(CO3)34− as a function in the solution pH is investigated in absence and in presence of carbonate. Removal percentage >99% is achieved in the pH range 8.5–11.5 in presence of 5×10−3 M carbonate. The influence of concentrations of ethanol (0.1–2% v/v) and CTAB (5×10−5–1.4×10−3 M) show that UO2(CO3)34− is efficiently removed at concentrations of 0.5–1.5% v/v and 4×10−4–1×10−3 M, respectively. Based on the obtained kinetic data, the flotation mechanism and the flotation rate are investigated using two different flotation models. Floatability of UO2(CO3)34− in presence of different cations (Ba2+, Ca2+, Mg2+ and Sr2+) and anions (NO3, Br, Cl, SO42− and HPO42−) is studied. Except for Mg2+ and NO3, the flotation efficiency of UO2(CO3)34− is significantly decreased at concentrations higher than 1×10−3 and 5×10−3 M of the studied cations and anions, respectively. Ion flotation process is efficiently applied for removal of uranium(VI), R%>98.5%, from seawater. Accordingly, ion flotation can be considered as a promising technique and thus its feasibility for removal and/or recovery of uranium(VI) from many aqueous environment.

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Received: 2017-5-14
Accepted: 2017-12-3
Published Online: 2018-2-1
Published in Print: 2018-6-27

©2018 Walter de Gruyter GmbH, Berlin/Boston

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