Single-Stage Extraction and Separation of Co2+ from Ni2+ Using Ionic Liquid of [C4H9NH3][Cyanex 272] |
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| Authors: | Xiaohua Jing Zhumei Sun Dandan Zhao Huimin Sun Jie Ren |
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| Affiliation: | 1.School of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, China;2.Henan Province Key Laboratory of New Optoelectronic Functional Materials, Anyang 455000, China;3.International Joint Laboratory of Henan Photoelectric Functional Materials, Anyang 455000, China;4.School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China; (Z.S.); (H.S.); (J.R.) |
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| Abstract: | The purpose of this study was to optimize the extraction conditions for separating Co2+ from Ni2+ using N-butylamine phosphinate ionic liquid of [C4H9NH3][Cyanex 272]. A Box–Behnken design of response surface methodology was used to analyze the effects of the initial pH, extraction time, and extraction temperature on the separation factor of Co2+ from sulfuric acid solution containing Ni2+. The concentrations of Co2+ and Ni2+ in an aqueous solution were determined using inductively coupled plasma-optical emission spectrometry. The optimized extraction conditions were as follows: an initial pH of 3.7, an extraction time of 55.8 min, and an extraction temperature of 330.4 K. The separation factor of Co2+ from Ni2+ under optimized extraction conditions was 66.1, which was very close to the predicted value of 67.2, and the error was 1.7%. The equation for single-stage extraction with high reliability can be used for optimizing the multi-stage extraction process of Co2+ from Ni2+. The stoichiometry of chemical reaction for ion-exchange extraction was also investigated using the slope method. |
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| Keywords: | extraction ionic liquid separation factor Co2+ from Ni2+ response surface methodology |
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