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http://dx.doi.org/10.12989/aer.2015.4.2.135

Adsorption/desorption of uranium on iron-bearing soil mineral surface  

Ha, Seonjin (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST))
Kyung, Daeseung (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST))
Lee, Woojin (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST))
Publication Information
Advances in environmental research / v.4, no.2, 2015 , pp. 135-142 More about this Journal
Abstract
In this study, we evaluated the adsorption/desorption of uranium (U) in pure soil environment using continuous column reactor. We additionally investigated the adsorption/desorption mechanism of U on vivianite surface in molecular scale using quantum calculation. We observed that below $0.1{\mu}M$ of U was detected after 20 d from U injection ($1{\mu}M$) in adsorption test. However, all of absorbed U was detached from vivianite surface in 24 h by injection of CARB solution ($1.44{\times}10^{-2}M\;NaHCO_3$ and $2.8{\times}10^{-3}M\;Na_2CO_3$). Based on exchange energy calculation, we found that $UO_2(CO_3)_2{^{2-}}$ and $UO_2(CO_3)_3{^{4-}}$ species have higher repulsive energy than $UO_2(OH)_2$ species. The results obtained from this study could be applied to predict the behavior of uranium in contaminated and remediation sites.
Keywords
uranium; adsorption/desorption; vivianite; column test; quantum calculation;
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Times Cited By KSCI : 1  (Citation Analysis)
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