Back to Search Start Over

Efficient Removal of [UO 2 ] 2+ , Cs + , and Sr 2+ Ions by Radiation-Resistant Gallium Thioantimonates.

Authors :
Feng ML
Sarma D
Gao YJ
Qi XH
Li WA
Huang XY
Kanatzidis MG
Source :
Journal of the American Chemical Society [J Am Chem Soc] 2018 Sep 05; Vol. 140 (35), pp. 11133-11140. Date of Electronic Publication: 2018 Aug 22.
Publication Year :
2018

Abstract

Unconventional ion exchangers can achieve efficient removal of [UO <subscript>2</subscript> ] <superscript>2+</superscript> , Cs <superscript>+</superscript> , and Sr <superscript>2+</superscript> ions from complex aqueous solutions and are of great interest for environmental remediation. We report two new gallium thioantimonates, [Me <subscript>2</subscript> NH <subscript>2</subscript> ] <subscript>2</subscript> [Ga <subscript>2</subscript> Sb <subscript>2</subscript> S <subscript>7</subscript> ]·H <subscript>2</subscript> O (FJSM-GAS-1) and [Et <subscript>2</subscript> NH <subscript>2</subscript> ] <subscript>2</subscript> [Ga <subscript>2</subscript> Sb <subscript>2</subscript> S <subscript>7</subscript> ]·H <subscript>2</subscript> O (FJSM-GAS-2), which present excellent ion exchange properties for [UO <subscript>2</subscript> ] <superscript>2+</superscript> , Cs <superscript>+</superscript> , and Sr <superscript>2+</superscript> ions. They exhibit high ion exchange capacities for [UO <subscript>2</subscript> ] <superscript>2+</superscript> , Cs <superscript>+</superscript> , and Sr <superscript>2+</superscript> ions ( q <subscript>m</subscript> <superscript>U</superscript> = 196 mg/g, q <subscript>m</subscript> <superscript>Cs</superscript> = 164 mg/g, and q <subscript>m</subscript> <superscript>Sr</superscript> = 80 mg/g for FJSM-GAS-1, q <subscript>m</subscript> <superscript>U</superscript> = 144 mg/g for FJSM-GAS-2) and short equilibrium times for [UO <subscript>2</subscript> ] <superscript>2+</superscript> ion exchange (5 min for FJSM-GAS-1 and 15 min for FJSM-GAS-2, respectively). Both compounds display active ion exchange with [UO <subscript>2</subscript> ] <superscript>2+</superscript> in the pH range of 2.9-10.5. Moreover, the sulfide compounds could maintain high distribution coefficients K <subscript>d</subscript> <superscript>U</superscript> even in the presence of excess Na <superscript>+</superscript> , Ca <superscript>2+</superscript> , and HCO <subscript>3</subscript> <superscript>-</superscript> . The distribution coefficient K <subscript>d</subscript> <superscript>U</superscript> of 6.06 × 10 <superscript>6</superscript> mL/g exhibited by FJSM-GAS-1 is the highest among the reported U adsorbents. The [UO <subscript>2</subscript> ] <superscript>2+</superscript> -laden products can be recycled by conveniently eluting the uranium with a low-cost method. These advantages combined with facile synthesis, as well as β and γ radiation resistance, make FJSM-GAS-1 and FJSM-GAS-2 promising for selective separations in nuclear waste remediation.

Details

Language :
English
ISSN :
1520-5126
Volume :
140
Issue :
35
Database :
MEDLINE
Journal :
Journal of the American Chemical Society
Publication Type :
Academic Journal
Accession number :
30088768
Full Text :
https://doi.org/10.1021/jacs.8b07457