Abstract
The present work deals with the extraction of copper(II) from sulphuric acid solutions with sodium diethyldithiocarbamate (SDDT) as the extracting agent, testing six different organic solvents, namely dichloromethane, chloroform, carbon tetrachloride, toluene, xylene and cyclohexane, as diluents. The SDDT-chloroform pair showed to be the most selective in removing the copper cations, and hence was considered throughout the experimental study concerning the effects of operating parameters such as the initial concentration of the extracting agent, the agitation time, the agitation speed and the acid concentration. For an initial Cu(II) concentration of 63 mg/L in a 0.5 M sulphuric acid solution and an extracting agent mass of 20 mg, an extraction percentage around 97.8% and a distribution coefficient of 44.42 were obtained, confirming the good performance of the SDDT-chloroform pair. Different reliable analytical techniques such as thermogravimetric analysis, differential scanning calorimetry, ultraviolet-visible analysis, Fourier transform infrared spectroscopy and elementary analysis were used to demonstrate that the acidity did affect neither the complexing agent nor the formed complex. The obtained results compared reasonably well with reported values in the literature and hence supporting the adopted approach.
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