Non-Dispersive Solvent Extraction of Neodymium using<i>N,N,N’,N’</i>-Tetraoctyl Diglycolamide (TODGA)

Vernekar, P. V.; Jagdale, Yogesh D.; Patwardhan, Ashwin W.; Patwardhan, Anand V.; Ansari, Seraj A.; Mohapatra, P. Κ.

doi:10.1080/01496395.2014.891614

Cited by 7 publications

(1 citation statement)

References 37 publications

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“…At that extractant concentration, electrolytes are adsorbed at the droplet via specific recognition until equilibrium is attained with the “excess” aqueous solution at fixed pH where the lanthanide is dissolved as nitrate salt . We use the very common extractant tetraoctyldiglycolamide (TODGA) used for rare earth and actinide separation, owing to the high affinity of the diglycolamide “head”. , Like all other neutral extractants used in practice, TODGA is an oil-soluble surface-active agent and therefore also a “weak” surfactant: the critical micelle concentration (CMC) in the oil phase is beyond 0.1 M . In the series of experiments here presented, the europium nitrate concentration of the water-bath is progressively increased.…”

Section: Introductionmentioning

confidence: 99%

Nanometric Surface Oscillation Spectroscopy of Water-Poor Microemulsions

et al. 2018

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Selectively exchanging metal complexes between emulsified water-poor microemulsions and concentrated solutions of mixed electrolytes is the core technology for strategic metal recycling. Nanostructuration triggered by solutes present in the organic phase is understood, but little is known about fluctuations of the microemulsion-water interface. We use here a modified version of an optoelectric device initially designed for air bubbles, in order to evidence resonant electrically induced surface waves of an oily droplet suspended in an aqueous phase. Resonant waves of nanometer amplitude of a millimeter-sized microemulsion droplet containing a common ion-specific extractant diluted by dodecane and suspended in a solution of rare earth nitrate are evidenced for the first time with low excitation fields (5 V/cm). From variation of the surface wave spectrum with rare earth concentration, we evidence uptake of rare-earth ions at the interface and at higher concentration the formation of a thin "crust" of liquid crystal forming at unusually low concentration, indicative of a surface induced phase transition. The effect of the liquid crystal structure on the resonance spectrum is backed up by a model, which is used to estimate crust thickness.

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