Electrochemical and Thermodynamic Properties of Ln(III) (Ln = Eu, Sm, Dy, Nd) in 1-Butyl-3-Methylimidazolium Bromide Ionic Liquid

He, Ling; Qin, Song; Tao, Guo‐Hong; Huang, Ming; Lv, Yi

doi:10.1371/journal.pone.0095832

Cited by 16 publications

(9 citation statements)

References 47 publications

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“…The absence of the oxidation processes demonstrates that it is an irreversible process, as has been reported in the literature for different lanthanides in ionic liquids and organic solvent-based electrolytes. ,− ,,, …”

mentioning

confidence: 55%

Water-Facilitated Electrodeposition of Neodymium in a Phosphonium-Based Ionic Liquid

Sanchez-Cupido

Pringle

Siriwardana

et al. 2019

J. Phys. Chem. Lett.

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Rare-earth metals are considered critical metals due to their extensive use in energy-related applications such as wind turbines and nickel−metal hybrid batteries found in hybrid electrical vehicles. A key drawback of the current processing methods includes the generation of large amounts of toxic and radioactive waste. Thus the efficient recovery of these valuable metals as well as cleaner processing methods are becoming increasingly important.Here we report on a clean electrochemical route for neodymium (Nd) recovery from [P 6,6,6,14 ][TFSI], trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)amide which is amplified three times by the presence of water, as evidenced by the cathodic current density and thicker deposits. The role of Nd salt concentrations and water content as an additive in the electrochemistry of Nd 3+ in [P 6,6,6,14 ][TFSI] has been studied. The presence of metallic neodymium in the deposits has been confirmed by X-ray photoelectron spectroscopy.

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mentioning

confidence: 55%

Water-Facilitated Electrodeposition of Neodymium in a Phosphonium-Based Ionic Liquid

Sanchez-Cupido

Pringle

Siriwardana

et al. 2019

J. Phys. Chem. Lett.

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“…Refractometer (Bellingham and Stanley, UK). The diffusion coefficient of Eu(III) in the aqueous and ionic liquid phases was obtained from the literature (Matsumiya et al, 2008;Rao et al, 2009;Ribeiro et al, 2011;Sengupta et al, 2012;Yang et al, 2014).…”

Section: Materials and Experimental Methodologiesmentioning

confidence: 99%

Intensified Eu(III) extraction using ionic liquids in small channels

Angeli

2016

Chemical Engineering Science

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The extraction of Eu(III) from nitric acid solutions was studied in intensified small scale separation units using an ionic liquid solution (0.2M n-octyl(phenyl)-N,N-diisobutylcarbamoylmethyphosphine oxide (CMPO)-1.2M Tributylphosphate) (TBP)/1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]amide; ([C4min][NTf2])as the extraction phase. The investigations were carried out in channels with 0.2 mm and 0.5 mm diameter for phase flowrates that result in plug flow with the aqueous solution as the dispersed phase. The interfacial area in plug flow and the velocity profiles within the plugs were studied with high speed imaging and bright field micro Particle Image Velocimetry. Distribution and mass transfer coefficients were found to have maximum values at nitric acid concentration of 1M. Mass transfer coefficients were higher in the small channel, where recirculation within the plugs and interfacial area are large, compared to the large channel for the same mixture velocities and phase flow rates. Within the same channel, mass transfer coefficients decreased with increasing residence time indicating that significant mass transfer takes place at the channel inlet where the two phases come into contact. The experimental results were compared with previous correlations on mass transfer coefficients in plug flows.

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“…This is consistent with previous reports on the electrochemical behaviour of other rare earths in ILs. [22,[35][36][37][38][39] Thus, from these experiments, we observed that an irreversible reduction process occurs in the presence of dissolved Nd 3þ in [P 66614 ] [TFSI], and that this process is highly affected by the presence of moisture and the electrolyte composition.…”

Section: Resultsmentioning

confidence: 62%

Electrochemistry of Neodymium in Phosphonium Ionic Liquids: The Influence of Cation, Water Content, and Mixed Anions

et al. 2020

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Electrodeposition using ionic liquids has emerged as an environmentally friendly approach to recover critical metals, such a neodymium. The investigation of ionic liquid chemistries and compositions is an important part of the move towards efficient neodymium recovery from end-of-life products that needs further research. Thus, in this paper we have investigated a series of phosphonium ionic liquids as potential electrolytic media. Anions such as bis(trifluoromethylsulfonyl)imide (TFSI), dicyanamide (DCA), and triflate (TfO) have been investigated, in combination with short-and long-alkyl-chain phosphonium cations. The work here suggests that [TFSI]is one of the most promising anions for successful deposition of Nd and that water plays an important role. In contrast, electrochemical behaviour was significantly hindered in the case of DCA ionic liquid, most likely owing to strong coordination between [DCA]and Nd 3þ. Mixtures of anions, [TfO]and [TFSI]-, have also been investigated in this work, resulting in two reduction processes that could be related to a different deposition mechanism involving two steps, as observed in the case of dysprosium or, alternatively, different coordination environments that have distinct deposition potentials. Additionally, we investigated the influence of electrode substrates-glassy carbon and copper. Cu electrodes resulted in the largest current densities and thus were used for subsequent electrodeposition at constant potential. These findings are valuable for optimising the deposition of Nd in order to develop more efficient and inexpensive recycling technologies for rare earth metals.

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Electrochemical and Thermodynamic Properties of Ln(III) (Ln = Eu, Sm, Dy, Nd) in 1-Butyl-3-Methylimidazolium Bromide Ionic Liquid

Cited by 16 publications

References 47 publications

Water-Facilitated Electrodeposition of Neodymium in a Phosphonium-Based Ionic Liquid

Water-Facilitated Electrodeposition of Neodymium in a Phosphonium-Based Ionic Liquid

Intensified Eu(III) extraction using ionic liquids in small channels

Electrochemistry of Neodymium in Phosphonium Ionic Liquids: The Influence of Cation, Water Content, and Mixed Anions

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