Separation of cobalt and nickel using inner synergistic extraction from bifunctional ionic liquid extractant (Bif-ILE).
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](2)SO(4)), sec-octylphenoxy acetic acid (CA-12), mixture of [A336](2)SO(4) and CA-12 at the acidities from 1x10(-5) mol L(-1) to 1x10(-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.
Sun
Xiaoqi
X
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Remin Street 5625, Changchun 130022, PR China.
Ji
Yang
Y
Zhang
Lina
L
Chen
Ji
J
Li
Deqian
D
D003035:Cobalt / Q000302:isolation & purification*; D007477:Ions; D009682:Magnetic Resonance Spectroscopy; D009532:Nickel / Q000302:isolation & purification*
D007477:Ions; D003035:Cobalt; D009532:Nickel