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Solvent extraction of gallium(III) from sodium hydroxide solution by alkylated hydroxyquinoline

1986; Elsevier BV; Volume: 16; Issue: 3 Linguagem: Inglês

10.1016/0304-386x(86)90006-x

1879-1158

Taichi Sato, Hiroyuki Oishi,

Advanced Photocatalysis Techniques

The distribution equilibria and kinetics of the extraction of gallium(III) from sodium hydroxide solutions by 7-(5,5,7,7-tetramethyl-locten-3-yl)-8-hydroxyquinoline (Kelex 100, designated HQ in the following) in kerosene have been examined under various conditions. From the dependence of the distribution coefficient on the concentrations of aqueous hydroxide and Kelex 100 it is deduced that the extraction can be expressed as Ga(OH)−4(a) + 3 HQ(o) ⇄ GaQ3(a) + OH−(a) + 3 H2 O(a). Furthermore, the kinetic results suggest that gallium(III) is taken up through the formation of either of two different activated species, Na+[Ga(OH)3 ], OH− and Na+ · Na+[Ga(OH)3], depending on the concentration of sodium hydroxide in the aqueous phase.