Ionic liquid-based uranium(vi) extraction with malonamide extractant: cation exchange vs. neutral extraction

Abstract

The U(VI) extraction with DMDBMA is performed in the [C4mim][Tf2N] ionic liquid (IL) either as a cationic or a neutral species, without the help of IL ions. However, this does not prevent a noticeable pollution of the aqueous phase with the IL.

Hydrophobic Deep Eutectic Solvents Incorporating Trioctylphosphine Oxide: Advanced Liquid Extractants

“…Usually TOPO is used in a hydrocarbon diluent such as kerosene although the solubility limit of pure TOPO in kerosene of around 0.1–0.2 mol dm –3 restricts the extractant concentrations that can be achieved . Recently the use of ionic liquid solvents for phosphine oxide-assisted partitioning of U­(VI) has also been reported, , building on earlier studies using hydrophobic ionic liquids as solvents for actinides and lanthanides. − …”

“…44 Recently the use of ionic liquid solvents for phosphine oxide-assisted partitioning of U(VI) has also been reported, 64,65 building on earlier studies using hydrophobic ionic liquids as solvents for actinides and lanthanides. [66][67][68][69] A significant difference between TOPO dissolved in kerosene (with relatively low solubility limit) and the TOPO:phenol (χ TOPO = 0.50) examined here as an extracting phase is the high TOPO content of ca. 80 wt% (1.875 mol L −1 ).…”

Role of Tf2N− anions in the ionic liquid–water distribution of europium(iii) chelates

“…[14][15][16][17][18] Application of ILs in LLD has many advantages. 19 Because ILs can act as liquid ion exchangers, not only neutral species but also positively or negatively charged species can be extracted into the IL by ion exchange via the cationic or anionic constituent of the ILs. [20][21][22] These unique mechanisms in an IL system oen lead to an enhancement in the extractability of a particular metal ion.…”

Solvent extraction of intra-lanthanides using a mixture of TBP and TODGA in ionic liquid

“…In fact, they are not inert diluents like molecular solvents and can modify the metal speciation in organic solutions and the extraction mechanisms. [25][26][27][28] Up to now, limited data in the literature are available on solvent extraction with binary extractant mixtures containing acidic extractant and neutral reagent dissolved in an ionic liquid. The extraction of uranium(VI) and iron(III) by mixtures of di-(2-ethylhexyl)-phosphoric acid (HDEHP) and trioctylphosphine oxide (TOPO) from phosphoric acid solutions was found to be synergic when either n-dodecane or 1-octyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C8mim][Tf2N]) was used as diluent.…”