Selective extraction of scandium from yttrium and lanthanides with amic acid-type extractant containing alkylamide and glycine moieties

Abstract

The liquid–liquid extraction of rare earth metal ions (scandium (Sc3+), yttrium (Y3+) and the lanthanides (La3+, Nd3+, Eu3+ and Dy3+)) was investigated using N-[N,N-di(2-ethylhexyl)aminocarbonylmethyl]glycine (D2EHAG).

Stoichiometry of Cu(II) Ion Extraction with di-2-ethylhexylphosphoric acid Dissolved in Waste Palm Cooking Oil

“…Slope analysis is a measurement of the variation of the distribution coefficient for a component at a time (Liu et al, 2014;Rydberg et al, 2004). On the other hand, the loading test is the measurement of the maximum capacity of complexation and decomplexation of the reaction (Baba et al, 2012;Talebi et al, 2015) while Job's method is used to measure the amount of product obtained in a solution that contains the same amount of components, but at a different ratio (Renny et al, 2013). In general, all these methods are used to determine the reaction stoichiometry in the various fields of chemical reaction, especially for metal-organic complexes in the solvent extraction.…”

“…Many methods are available to determine the reaction stoichiometry, such as slope analysis (Liu et al, 2014), loading capacity and loading test (Talebi et al, 2015), continuous variation method (Job's method) (Baba et al, 2012), ligand number method (Rydberg et al, 2004), numerical method (Chang et al, 2011), volumetric method (Pisarello et al, 2010) and infrared spectroscopy (Bidari et al, 2014). Out of those prominent methods, slope analysis, loading test and Job's method which consists of an experimental approach.…”

“…A number of extractants have been used in this context, and one of them is organophosphorous acid. Many related works have been reported to determine the stoichiometry of metal-complexation with organophosphorous acid, such as scandium-N-[N,Ndi(2-ethylhexyl) aminocarbonylmethyl] glycine (D2EHAG) complex (Baba et al, 2012), nickel-di-2-ethylhexylphosphoric acid (D2EHPA) complex (Talebi et al, 2015) and galliumoctyl phenyl acid phosphate (OPAP) complex (Mihaylov & Distin, 1995). However, most of these are using petroleum-based organic solvents, such as n-dodecane (Baba et al, 2012), benzene (Azzoug et al, 2014) and kerosene (Mihaylov & Distin, 1995;Talebi et al, 2015), which are harmful, flammable and toxic to environment (Talebi, 2012).…”

“…Out of those prominent methods, slope analysis, loading test and Job's method which consists of an experimental approach. These methods are the most 779 preferred methods used by numerous researchers (Baba et al, 2012;Ohto et al, 2006;Talebi et al, 2015). Slope analysis is a measurement of the variation of the distribution coefficient for a component at a time (Liu et al, 2014;Rydberg et al, 2004).…”

Alkylation and pre-organisation of diglycolamide ligands on flexible platforms for nuclear waste treatment

“…189 In little selectivity against RE metal ions. 193,194 The same substitution performed on DGAs made the ligands unable to extract Am (III) and Eu(III), unless a third amide group was also introduced, as in NTA-amide ligands.…”