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https://hdl.handle.net/11681/37381Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Larson, Steven L. | - |
| dc.contributor.author | Ballard, John H. | - |
| dc.contributor.author | White, Jeremy R. | - |
| dc.contributor.author | Arslan, Zikri | - |
| dc.contributor.author | Han, Fengxiang X. | - |
| dc.contributor.author | Yuan, Guodong. | - |
| dc.contributor.author | Meng, Fande | - |
| dc.date.accessioned | 2020-07-10T21:14:13Z | - |
| dc.date.available | 2020-07-10T21:14:13Z | - |
| dc.date.issued | 2020-07 | - |
| dc.identifier.govdoc | ERDC/EL MP-20-9 | - |
| dc.identifier.uri | https://hdl.handle.net/11681/37381 | - |
| dc.identifier.uri | http://dx.doi.org/10.21079/11681/37381 | - |
| dc.description | Miscellaneous Paper | en_US |
| dc.description.abstract | Humic acid (HA) is well known as an inexpensive and effective adsorbent for heavy metal ions. However, the thermodynamics of uranium (U) adsorption onto HA is not fully understood. This study aimed to understand the kinetics and isotherms of U(VI) adsorption onto HA under different temperatures from acidic water. A leonardite-derived HA was characterized for its ash content, elemental compositions, and acidic functional groups, and used for the removal of U (VI) from acidic aqueous solutions via batch experiments at initial concentrations of 0–100 mgL-1 at 298, 308 and 318 K. ICP-MS was used to determine the U(VI) concentrations in solutions before and after reacting with the HA. The rate and capacity of HA adsorbing U(VI) increased with the temperature. Adsorption kinetic data was best fitted to the pseudo second-order model. This, together with FTIR spectra, indicated a chemisorption of U(VI) by HA. Equilibrium adsorption data was best fitted to the Langmuir and Temkin models. Thermodynamic parameters such as equilibrium constant (K0), standard Gibbs free energy (ΔG0), standard enthalpy change (ΔH0), and standard entropy change (ΔS0), indicated that U(VI) adsorption onto HA was endothermic and spontaneous. The co-existence of cations (Cu2+, Co2+, Cd2+ and Pb2+) and anions (HPO42- and SO42-) reduced U(VI) adsorption. The high propensity and capacity of leonardite-derived HA adsorbing U(VI) suggests that it has the potential for cost-effective removal of U(VI) from acidic contaminated waters. | en_US |
| dc.description.sponsorship | Project Number 458170, “Depleted Uranium (DU) Clearance from DoD Ranges” | en_US |
| dc.description.sponsorship | Collaborative work was conducted by the U.S. Army ERDC and Jackson State University via Cooperative Agreement W912HZ-16-2-002. | - |
| dc.format.extent | 18 pages / 2.46 MB | - |
| dc.format.medium | PDF/A | - |
| dc.language.iso | en_US | en_US |
| dc.publisher | Environmental Laboratory (U.S.) | en_US |
| dc.publisher | Engineer Research and Development Center (U.S.) | - |
| dc.relation.ispartofseries | Miscellaneous Paper (Engineer Research and Development Center (U.S.));no. ERDC/EL MP-20-9 | - |
| dc.rights | Approved for public release; distribution is unlimited | - |
| dc.source | This Digital Resources was created in Microsoft Word and Adobe Acrobat | - |
| dc.subject | Humic acid | en_US |
| dc.subject | Uranium (VI) | en_US |
| dc.subject | FTIR | en_US |
| dc.subject | Adsorption | en_US |
| dc.subject | Chemisorption | en_US |
| dc.title | Kinetics and thermodynamics of uranium (VI) adsorption onto humic acid derived from leonardite | en_US |
| dc.type | Report | - |
| Appears in Collections: | Miscellaneous Paper | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ERDC-EL MP-20-9.pdf | 2.46 MB | Adobe PDF |  View/Open |