Hybrid anion exchanger for selective removal of...

Details Hybrid anion exchanger for selective removal of... Hybrid anion exchanger for selective removal of...

2007-11-06

2007-11-06

Barry, Chester T. (Department: 1724)

Catalyst, solid sorbent, or support therefor: product or process

Solid sorbent

Organic

C502S406000, C210S683000

Reexamination Certificate

active

10925600

ABSTRACT:
Polymeric anion exchangers are used as host materials in which hydrated Fe(III) Oxides (HFO) are irreversibly dispersed within the exchanger beads. Since the anion exchangers have positively charged quaternary ammonium functional groups, anionic ligands such as arsenates, chromates, oxalates, phosphates, phthalates can permeate in and out of the gel phase and are not subjected to the Donnan exclusion effect. Consequently, anion exchanger-supported HFO micro particles exhibit significantly greater capacity to remove arsenic and other ligands in comparison with cation exchanger supports. Loading of HFO particles is carried out by preliminary loading of the anion exchange resin with an oxidizing anion such as MnO4−or OCl−, followed by passage of a Ferrous Sulfate solution through the resin.

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M.J. Demarco, A.K. Sengupta and J.E. Greenleaf, Arsenic removal using a polymeric/inorganic hybrid sorbent, Water Research, 37 (2003), 164-176, available on-line Oct. 29, 2002.
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B.A. Manning, S.E. Fendorf and S.E. Goldberg, Environ. Sci. Technol., 32 (1998), 2383-2388.

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