Efficient Uranium Capture by Polysulfide/Layered Double Hydroxide Composites

Shulan Ma, Lu Huang, Lijiao Ma, Yurina Shim, Saiful M. Islam, Pengli Wang, Li Dong Zhao, Shichao Wang, Genban Sun, Xiaojing Yang, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

160 Citations (Scopus)

Abstract

There is a need to develop highly selective and efficient materials for capturing uranium (normally as UO22+) from nuclear waste and from seawater. We demonstrate the promising adsorption performance of Sx-LDH composites (LDH is Mg/Al layered double hydroxide, [Sx]2- is polysulfide with x = 2, 4) for uranyl ions from a variety of aqueous solutions including seawater. We report high removal capacities (qm = 330 mg/g), large KdU values (104-106 mL/g at 1-300 ppm U concentration), and high % removals (>95% at 1-100 ppm, or ∼80% for ppb level seawater) for UO22+ species. The Sx-LDHs are exceptionally efficient for selectively and rapidly capturing UO22+ both at high (ppm) and trace (ppb) quantities from the U-containing water including seawater. The maximum adsorption coeffcient value KdU of 3.4 × 106 mL/g (using a V/m ratio of 1000 mL/g) observed is among the highest reported for U adsorbents. In the presence of very high concentrations of competitive ions such as Ca2+/Na+, Sx-LDH exhibits superior selectivity for UO22+, over previously reported sorbents. Under low U concentrations, (S4)2- coordinates to UO22+ forming anionic complexes retaining in the LDH gallery. At high U concentrations, (S4)2- binds to UO22+ to generate neutral UO2S4 salts outside the gallery, with NO3- entering the interlayer to form NO3-LDH. In the presence of high Cl- concentration, Cl- preferentially replaces [S4]2- and intercalates into LDH. Detailed comparison of U removal efficiency of Sx-LDH with various known sorbents is reported. The excellent uranium adsorption ability along with the environmentally safe, low-cost constituents points to the high potential of Sx-LDH materials for selective uranium capture.

Original languageEnglish
Pages (from-to)3670-3677
Number of pages8
JournalJournal of the American Chemical Society
Volume137
Issue number10
DOIs
Publication statusPublished - Mar 18 2015

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Polysulfides
Uranium
Seawater
Adsorption
Composite materials
Sorbents
Ions
Radioactive Waste
Radioactive wastes
Adsorbents
Salts
Costs and Cost Analysis
hydroxide ion
polysulfide
Water
Costs

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Efficient Uranium Capture by Polysulfide/Layered Double Hydroxide Composites. / Ma, Shulan; Huang, Lu; Ma, Lijiao; Shim, Yurina; Islam, Saiful M.; Wang, Pengli; Zhao, Li Dong; Wang, Shichao; Sun, Genban; Yang, Xiaojing; Kanatzidis, Mercouri G.

In: Journal of the American Chemical Society, Vol. 137, No. 10, 18.03.2015, p. 3670-3677.

Research output: Contribution to journalArticle

Ma, S, Huang, L, Ma, L, Shim, Y, Islam, SM, Wang, P, Zhao, LD, Wang, S, Sun, G, Yang, X & Kanatzidis, MG 2015, 'Efficient Uranium Capture by Polysulfide/Layered Double Hydroxide Composites', Journal of the American Chemical Society, vol. 137, no. 10, pp. 3670-3677. https://doi.org/10.1021/jacs.5b00762
Ma, Shulan ; Huang, Lu ; Ma, Lijiao ; Shim, Yurina ; Islam, Saiful M. ; Wang, Pengli ; Zhao, Li Dong ; Wang, Shichao ; Sun, Genban ; Yang, Xiaojing ; Kanatzidis, Mercouri G. / Efficient Uranium Capture by Polysulfide/Layered Double Hydroxide Composites. In: Journal of the American Chemical Society. 2015 ; Vol. 137, No. 10. pp. 3670-3677.
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