Varadharajan N Kailasam

age ~48

from Bartlesville, OK

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Nanoporous Silica Polyamine Composites With Surface-Bound Zirconium (Iv) And Methods Of Use
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US Patent:

20140066529, Mar 6, 2014
Filed:

Nov 6, 2013
Appl. No.:

14/073742
Inventors:

Varadharajan Kailasam - Towanda PA, US
Daniel Nielsen - Burlington VT, US
Assignee:

The University of Montana - Missoula MT
International Classification:

C02F 1/42
US Classification:

521 30
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-HSO. 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.

Nanoporous Silica Polyamine Composites With Surface-Bound Zirconium (Iv) And Methods Of Use
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US Patent:

20110226699, Sep 22, 2011
Filed:

Mar 22, 2011
Appl. No.:

13/069238
Inventors:

Edward Rosenberg - Missoula MT, US
Varadharajan Kailasam - Towanda PA, US
International Classification:

C02F 1/62
B01J 41/12
US Classification:

210688, 521 30
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-HSO. 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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