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| 11. |
SORPTION BEHAVIOUR OF URANIUM AND THORIUM ON CRYPTOMELANE-TYPE HYDROUS MANGANESE DIOXIDE FROM AQUEOUS SOLUTION |
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Solvent Extraction and Ion Exchange,
Volume 11,
Issue 3,
1993,
Page 521-540
I. M. EL-NAGGAR,
M.A. EL-ABSY,
M.M. ABDEL-HAMID,
H.F. ALY,
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PDF (218KB)
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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.
ISSN:0736-6299
DOI:10.1080/07366299308918171
出版商:Taylor & Francis Group
年代:1993
数据来源: Taylor
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| 12. |
ION-EXCHANGE STUDIES WITH SOME COMPLEX IONS ON ION-EXCHANGE RESINS |
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Solvent Extraction and Ion Exchange,
Volume 11,
Issue 3,
1993,
Page 541-554
Necati Beşirli,
BahattinM. Baysal,
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PDF (136KB)
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摘要:
The ion exchange equilibria of Cr(NH3)3+, Cr(NH3)5Cl2+, cis-Cr(en)2Cl2+, trans-Cr(en)2(SCN)2+, Cr(H2O)63+complex ions against La3+ions were studied. The effect of the ionic charge, radius and composition of various chromium complex ions on the selectivity were discussed. The logarithms of the selectivity constants were plotted versus mole fraction of complex ions in the resin phase. Linear variations with negative slopes were observed in experiments except for the Cr(H2O)63+-La3+system.
ISSN:0736-6299
DOI:10.1080/07366299308918172
出版商:Taylor & Francis Group
年代:1993
数据来源: Taylor
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