Oxine modified silican polyamine composites for the separation of gallium from aluminum, ferric from nickel and copper from nickel
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United States of America Patent
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Jan 1, 2013
Grant Date -
May 24, 2012
app pub date -
Oct 13, 2011
filing date -
Oct 13, 2010
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Abstract
The oxine ligands 5-chloro-8-hydroxyquiniline and 5-sulfoxyl-8-hydroxyquinoline are covalently bound, using, for example, the Mannich reaction, to a silica gel polyamine composite made from a silanized amorphous silica xerogel and polyallylamine. The resulting modified composites, termed CB-1 (X═Cl) and SB-1 (X═SO3H), respectively, show a clear selectivity for trivalent over divalent ions and selectivity for gallium over aluminum. The compounds of the invention can be applied for the sequestration of metals, such as heavy metals, from contaminated mine tailing leachates.
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