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Silane coupling and mordanting as attachment techniques for pyridylazo and thiazolylazo ligands in the synthesis of adsorbents for uranium in seawater

Journal Article · · Adsorption Science and Technology
 [1];  [2];  [2];  [3];  [2]
  1. The Catholic Univ. of America, Washington, DC (United States); The Catholic University of America, 620 Michigan Avenue, Washington, DC 20064, USA
  2. The Catholic Univ. of America, Washington, DC (United States)
  3. Univ. of Maryland, College Park, MD (United States)
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Activated carbon adsorbents modified with azo compounds (4-(2-pyridylazo)resorcinol, 1-(2-pyridylazo)-2-naphthol, 4-(2-thiazolylazo)resorcinol), or with allyl and vinylbenzyl derivatives of 4-(2-thiazolylazo)resorcinol, were observed to be highly effective in removing uranium from seawater and providing high loadings. Adsorbents consisting of azo compounds attached to fiber fabrics were prepared using silane coupling to attach azo reagents to silica fibers or mordanting agents such as tannic acid or aluminum acetate to attach them to cellulose fibers. Loadings of 15–45 mg U g-1 adsorbent were obtained. Scanning electron microscopy/energy dispersive X-ray spectroscopy measurements confirmed the presence of high concentrations of uranium on the surface of the silica-based and cellulose-based fibers.
Research Organization:
The Catholic Univ. of America, Washington, DC (United States); Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
NE0000723
OSTI ID:
1498891
Journal Information:
Adsorption Science and Technology, Journal Name: Adsorption Science and Technology Journal Issue: 3-4 Vol. 36; ISSN 0263-6174
Country of Publication:
United States
Language:
English

References (19)

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Novel poly(imide dioxime) sorbents: Development and testing for enhanced extraction of uranium from natural seawater journal August 2016
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Synthesis, Development, and Testing of High-Surface-Area Polymer-Based Adsorbents for the Selective Recovery of Uranium from Seawater journal December 2015
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Amidoxime-modified mesoporous silica for uranium adsorption under seawater conditions journal January 2015
Sequestering uranium from seawater: binding strength and modes of uranyl complexes with glutarimidedioxime journal January 2012
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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
azo dyes
mordants
seawater
silanization
uranium