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Optimizing the extraction of cobalt ions under response surface methodology and without organic solutions |
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| Authors: | Razieh Sobhi Amjad Mehdi Asadollahzadeh Rezvan Torkaman Meisam Torab-Mostaedi |
| Affiliation: | 1. Faculty of Chemistry, Bu-Ali-Sina University, Hamedan, Iran Contribution: Writing - original draft;2. Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, Iran;3. Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, Iran Contribution: Data curation, Investigation;4. Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, Iran Contribution: Conceptualization, Investigation, Validation |
| Abstract: | In this study, response surface methodology was used to evaluate the extraction of cobalt ions using an aqueous two-phase system (ATPS). This method is environmentally benign and low-risk because water has replaced the poisonous and dangerous organic solvents in this extraction procedure. For the first time, a central composite design was employed to examine the effect of various factors on the extraction of cobalt ions. The findings of the experimental design revealed that the concentration and volume of cobalt ions had a considerable impact on the extraction percentage in the ATPS system. In contrast, the concentration of ammonium sulphate and pH had only a minor effect. The value of the correlation coefficient (R2 = 0.9565) clearly shows the agreement between the mathematical model and the experimental results. The maximum extraction percentage was attained in optimum conditions (50% polyethylene glycol concentration, 3.75 M salt concentration, 0.5 ml cobalt volume, and pH 4). |
| Keywords: | aqueous two-phase system cobalt experimental design polyethylene glycol |