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Origin of the unusually strong and selective binding of vanadium by polyamidoximes in seawater.
- Source :
- Nature Communications; 11/16/2017, Vol. 8 Issue 1, p1-10, 10p
- Publication Year :
- 2017
-
Abstract
- Amidoxime-functionalized polymeric adsorbents are the current state-of-the-art materials for collecting uranium (U) from seawater. However, marine tests show that vanadium (V) is preferentially extracted over U and many other cations. Herein, we report a complementary and comprehensive investigation integrating ab initio simulations with thermochemical titrations and XAFS spectroscopy to understand the unusually strong and selective binding of V by polyamidoximes. While the open-chain amidoxime functionalities do not bind V, the cyclic imide-dioxime group of the adsorbent forms a peculiar non-oxido V<superscript>5+</superscript> complex, exhibiting the highest stability constant value ever observed for the V<superscript>5+</superscript> species. XAFS analysis of adsorbents following deployment in environmental seawater confirms V binding solely by the imide-dioximes. Our fundamental findings offer not only guidance for future optimization of selectivity in amidoxime-based sorbent materials, but may also afford insight to understanding the extensive accumulation of V in some marine organisms. [ABSTRACT FROM AUTHOR]
- Subjects :
- VANADIUM
SORBENTS
URANIUM
SPECTROMETRY
SEAWATER
Subjects
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 8
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 138016562
- Full Text :
- https://doi.org/10.1038/s41467-017-01443-1