Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 283, Issue 1, Pages 253-259Publisher
SPRINGER
DOI: 10.1007/s10967-009-0323-0
Keywords
MX-80 bentonite; U(VI); Sorption; Humic acid; Fulvic acid
Funding
- National Natural Science Foundation of China [20677058, 20501019]
- Special Foundation for High-level Waste Disposal [2007-840]
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The sorption of U(VI) from aqueous solution on MX-80 bentonite was studied as a function of contact time, pH, ionic strength, solid contents, humic acid (HA), fulvic acid (FA) and temperature under ambient conditions using batch technique. The results indicate that sorption of U(VI) on MX-80 bentonite is strongly dependent on pH and ionic strength. The removal of U(VI) to MX-80 bentonite is rather quick and the kinetic sorption data is simulated well by a pseudo-second-order rate equation. The presence of HA enhances the sorption of U(VI) on MX-80 bentonite obviously, but the influence of FA on U(VI) sorption is not obvious. The thermodynamic parameters (Delta H-0, Delta S-0, and Delta G(0)) for the sorption of U(VI) calculated from temperature dependent sorption suggest that the sorption reaction is endothermic and spontaneous.
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