Abstract
The inner synergistic extraction of [tricaprylmethylammonium][sec-octylphenoxy acetate] ([A336][CA-12]) is studied for cobalt and nickel separation. Distribution ratios of [A336][CA-12] for Co 2+ or Ni 2+ are by far higher than those of tricaprylmethylammonium sulfate ([A336] 2SO 4), sec-octylphenoxy acetic acid (CA-12), mixture of [A336] 2SO 4 and CA-12 at the acidities from 1 × 10 −5 mol L −1 to 1 × 10 −3 mol L −1. The synergy coefficients of [A336][CA-12] for Co 2+ are higher than the synergy coefficients of [A336][CA-12] for Ni 2+, which can be used for the Co 2+ and Ni 2+ separation. Some thermodynamic properties of the inner synergistic extraction using [A336][CA-12] for Co 2+ and Ni 2+ are also studied, such as influence of temperature, thermodynamic functions, extraction mechanism, separation factors and stripping properties.
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