GEOC 40 |
| Uniformly arrayed zirconium-phosphate nanoporous material was synthesized and used as an adsorbent for removal of U(VI) in NaNO3 solution with varying background conditions including pH, ionic strength, U(VI) concentrations, and carbonate concentrations. Batch U(VI) adsorption results showed that U(VI) adsorption reached steady state condition within 48 hours and all the dissolved U(VI) (10-6 M) was adsorbed by this material at neutral pH and closed condition to the atmospheric CO2(g). U(VI) adsorption followed a traditional Langmuir adsorption isotherm and distribution coefficient (Kd) calculated from the linear region of the Langmuir isotherm was 105,000 mL/g. Because this phosphate bearing nanoporous material exhibits high stability at temperature and has a very high Kd value, it can be applied as an efficient adsorbent for removing U(VI) from various contaminated waste streams such as those present at DOE defense sites and the proposed deep geologic burial ground at Yucca Mountain. |
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General Poster Session
7:00 PM-9:00 PM, Sunday, 10 September 2006 Moscone Center -- Hall D, Poster
Division of Geochemistry |