Nanoporous silica polyamine composites with surface-bound zirconium (IV) and methods of use
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United States of America Patent
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Jun 6, 2017
Grant Date -
Mar 6, 2014
app pub date -
Nov 6, 2013
filing date -
Mar 22, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
Silica polyamine composites (SPC) made from silanized amorphous nano-porous silica gel and poly(allylamine) (BP-1) were functionalized with phosphorus acid using the Mannich reaction, resulting in a phosphonic acid modified composite (BPAP). Zirconium (IV) was immobilized on BPAP. Arsenate anions strongly adsorbed on the ZrBPAP composite in the pH range 2 to 8, while arsenite only adsorbed well at pH 10. Regeneration of the resin was carried out successfully for As(V) and As(III) using 2M-H2SO4. Four adsorption/desorption cycles were performed for As(V) at pH 4 without significant decrease in the uptake performance. ZrBPAP capture capacity and kinetics for arsenate were tested for longevity over 1000 cycles with only a marginal loss of performance.
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- 2013 Application Filing Year
- B01J Class
- 2563 Applications Filed
- 2267 Patents Issued To-Date
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