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https://hdl.handle.net/11681/37378| Title: | Removing uranium (VI) from aqueous solution with insoluble humic acid derived from leonardite |
| Authors: | Larson, Steven L. Ballard, John H. Meng, Fande Arslan, Zikri Han, Fengxiang X. Yuan, Guodong Waggoner, Charles A. |
| Keywords: | Uranium contamination Depleted uranium Leonardite Humic acid Artificial seawater Desorption Soil |
| Publisher: | Environmental Laboratory (U.S.) Engineer Research and Development Center (U.S.) |
| Series/Report no.: | Miscellaneous Paper (Engineer Research and Development Center U.S.));no. ERDC/EL MP-20-8 |
| Abstract: | The occurrence of uranium (U) and depleted uranium (DU)-contaminated wastes from anthropogenic activities is an important environmental problem. Insoluble humic acid derived from leonardite (L-HA) was investigated as a potential adsorbent for immobilizing U in the environment. The effect of initial pH, contact time, U concentration, and temperature on U(VI) adsorption onto L-HA was assessed. The U(VI) adsorption was pH-dependent and achieved equilibrium in 2 h. It could be well described with pseudosecond- order model, indicating that U(VI) adsorption onto L-HA involved chemisorption. The U(VI) adsorption mass increased with increasing temperature with maximum adsorption capacities of 91, 112 and 120 mg g-1 at 298, 308 and 318 K, respectively. The adsorption reaction was spontaneous and endothermic. We explored the processes of U(VI) desorption from the L-HA-U complex through batch desorption experiments in 1 mM NaNO3 and in artificial seawater. The desorption process could be well described by pseudo-first-order model and reached equilibrium in 3 h. L-HA possessed a high propensity to adsorb U(VI). Once adsorbed, the release of U(VI) from L-HA-U complex was minimal in both 1 mM NaNO3and artificial seawater (0.06% and 0.40%, respectively). Being abundant, inexpensive, and safe, LHA has good potential for use as a U adsorbent from aqueous solution or immobilizing U in soils. |
| Description: | Miscellaneous Paper |
| Gov't Doc #: | ERDC/EL MP-20-8 |
| Rights: | Approved for public release; distribution is unlimited |
| URI: | https://hdl.handle.net/11681/37378 http://dx.doi.org/10.21079/11681/37378 |
| Appears in Collections: | Miscellaneous Paper |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ERDC-EL MP-20-8.pdf | 1.34 MB | Adobe PDF |  View/Open |