Extraction of cobalt (II) and nickel (II) by a solvent impregnated resin containing bis(2,4,4-trimethylpentyl)monothiophosphinic acid |
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Authors: | F T Mu Q Jia Y M Tian Q K Shang |
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Institution: | (1) College of Chemistry, Jilin University of Nanling Campus, Changchun, 130022, People’s Republic of China;(2) College of Chemistry, Northeast Normal University, Changchun, 130024, People’s Republic of China |
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Abstract: | In the present work, studies have been conducted on the equilibrium distribution of cobalt (II) and nickel (II) between aqueous
hydrochloric solution and macromolecular resin impregnated with bis(2,4,4-trimethylpentyl)monothiophosphinic acid (Cyanex302,
HL). Effects of extraction time, pH values, metal ion concentration, and temperature were investigated. Analysis of the results
shows that the extraction of the two metal ions can be explained assuming the formation of metal complexes in the resin phase
with a general composition ML
2. An extraction reaction is proposed and the equilibrium constants of the complexes were determined. The Freundlich isotherm
and thermodynamic quantities, i.e., ΔG, ΔH and ΔS were also obtained. Both of the extraction reactions of cobalt (II) and nickel (II) are endothermic ones. The efficiency
of the resin in the separation of cobalt (II) and nickel (II) is provided according to the separation factors. Under the experimental
conditions employed, pH50 values for cobalt (II) and nickel (II) are 3.76, 5.01, respectively. The logarithmic value of separation factor was calculated
as 2.50. |
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Keywords: | Extraction Cobalt Nickel Solvent impregnated resin Bis(2 4 4-trimethylpentyl)monothiophosphinic acid |
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