SORPTION BEHAVIOUR OF URANIUM AND THORIUM ON CRYPTOMELANE-TYPE HYDROUS MANGANESE DIOXIDE FROM AQUEOUS SOLUTION
作者:
I. M. EL-NAGGAR,
M.A. EL-ABSY,
M.M. ABDEL-HAMID,
H.F. ALY,
期刊:
Solvent Extraction and Ion Exchange
(Taylor Available online 1993)
卷期:
Volume 11,
issue 3
页码: 521-540
ISSN:0736-6299
年代: 1993
DOI:10.1080/07366299308918171
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The kinetics of sorption of uranium and thorium from aqueous nitrate solutions on cryptomelane-type hydrous manganese dioxide (CRYMO) was studied. The exchange of uranium is particle diffusion controlled while that of thorium is chemical reaction at the exchange sites. Sorption of uranium and thorium by CRYMO has been also studied as a function of metal concentrations and temperature. The sorption of both cations is found to be an endothermic process and increases markedly with temperature between 30 and 60°C. The sorption results have been analysed by the langmuir adsorption isotherm over the entire range of uranium and thorium concentrations investigated.
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