Fang Yuan, Yawen Cai, Zhiyong Liu, Lanhua Chen, Yue Lang, Xiangke Wang, Shitong Yang*, Shuao Wang*. "Simultaneous sequestration of uranyl and arsenate at the goethite/water interface " J. Radio****. Nucl. Chem.2016, accepted.
Abstract
This study highlights the simultaneous sequestration of U(VI) and arsenate at the goethite/water interface. The uptake trends and speciation of these two components were related with molar arsenate/U(VI) ratio, solution pH, contact order and aging time. A metastable [UO2(H2AsO4)2•H2O] was observed after 3 d and then this solid completely transformed into Na2(UO2AsO4)2•3H2O after 7 d. The disodium ethylenediamine tetraacetate ligand gave rise to the complete dissolution of Na2(UO2AsO4)2•3H2O phase and the release of U(VI) and arsenate back into the solution. The experimental findings facilitated us better comprehend the migration and fate of coexisting U(VI) and arsenate in the aquatic environment.