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Title: K 2x Sn 4-x S 8-x (x = 0.65–1): a new metal sulfide for rapid and selective removal of Cs + , Sr 2+ and UO 2 2+ ions

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/c5sc03040d· OSTI ID:1352636
 [1];  [1];  [1];  [1];  [2]
  1. Northwestern Univ., Evanston, IL (United States)
  2. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
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The fission of uranium produces radionuclides, 137Cs and 90Sr, which are major constituents of spent nuclear fuel. The half-life of 137Cs and 90Sr is nearly 30 years and thus that makes them harmful to human life and the environment. The selective removal of these radionuclides in the presence of high salt concentrations from industrial nuclear waste is necessary for safe storage. We report the synthesis and crystal structure of K2xSn4-xS8-x (x = 0.65–1, KTS-3) a material which exhibits excellent Cs+, Sr2+ and UO22+ ion exchange properties in varying conditions. Furthermore, the compound adopts a layered structure which consists of exchangeable potassium ions sandwiched between infinite layers of octahedral and tetrahedral tin centers. K2xSn4-xS8-x (x = 0.65–1, KTS-3) crystallizes in the monoclinic space group P21/c with cell parameters a = 13.092(3) Å, b = 16.882(2) Å, c = 7.375(1) Å and β = 98.10(1)°. Refinement of the single crystal diffraction data revealed the presence of Sn vacancies in the tetrahedra that are long range ordered. The interlayer potassium ions of KTS-3 can be exchanged for Cs+, Sr2+ and UO22+. KTS-3 exhibits rapid and efficient ion exchange behavior in a broad pH range. The distribution coefficients (Kd) for KTS-3 are high for Cs+ (5.5 × 104), Sr2+ (3.9 × 105) and UO22+ (2.7 × 104) at neutral pH (7.4, 6.9, 5.7 ppm Cs+, Sr2+ and UO22+, respectively; V/m ~ 1000 mL g-1). KTS-3 exhibits impressive Cs+, Sr2+ and UO22+ ion exchange properties in high salt concentration and over a broad pH range, which coupled with the low cost, environmentally friendly nature and facile synthesis underscores its potential in treating nuclear waste.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; DMR-1410169
OSTI ID:
1352636
Journal Information:
Chemical Science, Vol. 7, Issue 2; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 159 works
Citation information provided by
Web of Science

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Ammoniating Covalent Organic Framework (COF) for High‐Performance and Selective Extraction of Toxic and Radioactive Uranium Ions journal June 2019
Cesium Doped NiO x as an Efficient Hole Extraction Layer for Inverted Planar Perovskite Solar Cells journal June 2017
[CH 3 NH 3 ] 4 Ga 4 SbS 9 S 0.28 O 0.72 H: A Three-Dimensionally Open-Framework Heterometallic Chalcogenidoantimonate Exhibiting Ni 2+ Ion-Exchange Property journal February 2018
The Role of [BF 4 ] − and [B(CN) 4 ] − Anions in the Ionothermal Synthesis of Chalcogenidometalates journal January 2018
Removal of heavy metal ions from aqueous system by ion-exchange and biosorption methods journal December 2018
Preparation of potassium niobium sulfide and its selective adsorption properties for Sr2+ and Co2+ journal August 2019
Fe 3 O 4 @ZIF-8: a magnetic nanocomposite for highly efficient UO 2 2+ adsorption and selective UO 2 2+ /Ln 3+ separation journal January 2017
Assembly of supertetrahedral clusters into a Cu–In–S superlattice via an unprecedented vertex–edge connection mode journal January 2017
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