The apparent enthalpy and entropy of the complexation of uranium (VI) and vanadium (V) with amidoxime ligands grafted onto polyethylene fiber was determined using time series measurements of adsorption capacities in natural seawater at three different temperatures. The complexation of uranium was highly endothermic, while the complexation of vanadium showed minimal temperature sensitivity. Amidoxime-based polymeric adsorbents exhibit significantly increased uranium adsorption capacities and selectivity in warmer waters.
Revised: February 12, 2018 |
Published: January 16, 2018
Citation
Kuo L., G.A. Gill, C. Tsouris, L. Rao, H. Pan, C.M. Wai, and C.J. Janke, et al. 2018.Temperature Dependence of Uranium and Vanadium Adsorption on Amidoxime-Based Adsorbents in Natural Seawater.ChemistrySelect 3, no. 2:843-848.PNNL-SA-126070.doi:10.1002/slct.201701895