Rare earth metals (SEMs) are considered critical materials because of their great demand for use in essential technologies that enable the transition to a more environmentally friendly energy technology and economy. The significant environmental and health impacts caused by the current primary procurement of REMs, ie Mining urgently calls for more sustainable and environmentally friendly alternatives. Here we report a cleaner approach to recovering Nd above electrochemical deposition with inexpensive and non-fluorinated ionic liquid (IL). In contrast to the most frequently investigated ILs using the bis (trifluoromethanesulfonyl) imide anion, we show here a successful electrodeposition of Nd using 0.5 mol kg−1 Neodymium nitrate (Nd (NO3rd) 6H2O) in N.-Butyl-N.-Methylpyrrolidinium dicyanamide ([C4mpyr][DCA] ) IL electrolyte, while an eight times higher current density (-38 mA cm) is reported−2) at a lower temperature (halved to 50 ° C) and a less controlled environment (0.15-4.6 wt% H.2O) compared to parameters previously given in the literature. Furthermore, the effect of Nd salts and their concentration on the physical properties of the electrolyte, Nd3+ The electrochemical behavior, the composition of the electrodeposition and the efficiency of the Nd recovery were investigated using Nd (OTf).3rd(Trifluoromethanesulfonate [OTf] – –) and Nd (NO3rd) 6H2O in [C4mpyr][DCA] IL electrolytes. The XPS analysis confirmed the presence of a higher Nd metal content in the electrodeposition resulting from the nitrate system.

Graphic summary: Fluorine-free ionic liquid electrolytes for sustainable neodymium recovery using an electrochemical approach


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