Selective electrochemical capture and release of uranyl from aqueous alkali, lanthanide, and actinide mixtures using redox-switchable carboranes

Abstract

Redox-switchable carboranes electrochemically capture and release UO22+ selectively from mixed metal aqueous solutions, mimicking in part spent nuclear fuel.

Organophosphorus Extractants: A Critical Choice for Actinides/Lanthanides Separation in Nuclear Fuel Cycle

“…As shown in Figure 9c, these capture and release processes make this system the ability to selectively extract UO 2 2 + ions over other interfering metal ions like Cs(I), Th(IV), Sm(III) and Nd(III) from aqueous phases. [80] Figure 9. (a) Mechanism of the chemical or electrochemical capture and release of UO 2 2 + with closo-carborane/nido-carborane system.…”

“…(c) Selective capture and release of UO 2 2 + from aqueous solutions containing alkali, lanthanide, and actinide metals by using the PO Cb 2À / PO Cb system. [80] (Copyright © CC BY-NC 3.0)…”

“…Figure 9b confirms that the PO Cb/ PO Cb 2− system has a strong ability to extract UO 2 2+ , a weak ability to extract Th(IV) ( SF U/Th =25), and no extraction for Nd(III), Sm(III), and Cs(I). As shown in Figure 9c, these capture and release processes make this system the ability to selectively extract UO 2 2+ ions over other interfering metal ions like Cs(I), Th(IV), Sm(III) and Nd(III) from aqueous phases [80] …”

Insights into the spontaneous multi-scale supramolecular assembly in an ionic liquid-based extraction system

“…In particular, extensive interests have been focused on the selective extraction of uranium, the actual fuel to the production of nuclear power. 21,[24][25][26] So far, the knowledge concerning the selectivity in an extraction process has not been beyond micro-and meso-scales yet. [27][28][29] If the MSSA procedure as suggested above could be successfully designed in an extraction system, the function of high selectivity would originate from comprehensive multi-scale effects such as the supramolecular recognition on the microscopic and mesoscopic scales, 12,30 as well as the kinetics controlling on the macroscopic scale depending on the temperature.…”

Electrochemical Cycling of Redox-Active Boron Cluster-Based Materials in the Solid State

“…[47][48][49] More recently, there have been extensive efforts in developing some of these clusters for solid state electrolyte applications. Recent advances in boron cluster chemistry [44][45][88][89][90][91][92][93][94][95][96][97][98] show that judicious exopolyhedral modifications of these species can result in the emergence of boron-centered redox events in solution, which in many cases can be tunable. In particular, ether-functionalized dodecaborate clusters [B 12 (OR) 12 ; R = alkyl, aryl] demonstrate the richest solution-based redox behavior exhibited by boron clusters studied to date.…”