Amberlite XAD-2 impregnated organophosphinic acid extractant for separation of uranium(VI) from rare earth elements

Kinetics, equilibrium and thermodynamic study of Cr(VI) sorption into toluidine blue o-impregnated XAD-7 resin beads and its application for the treatment of wastewaters containing Cr(VI)

“…The impregnation method is free from difficulties encountered in chemically linking a chelating reagent to a support matrix. In addition, there is a wide choice of reagents for desired selectivity [21][22][23].…”

Recovery and Separation of Metal Ions from Aqueous Solutions by Solvent‐Impregnated Resins

“…XAD-2 impregnated with Cyanex 272 proved to be reliable in isolation of U(VI) from synthetic mixture, uranmicrolite (leachates) ore tailings, and industrial effluents [136,137]. However, Karve and Rajgor [138] compared the sorption of U(VI), Th(IV), Nd(III), and La(III) on XAD-2 resins impregnated with Cyanex 272 and Cyanex 302, respectively. Cyanex 302 can achieve high separation factors between U(VI) and REEs because it contains a soft donor ''S'' for U(VI).…”

“…The separation of metals is generally achieved by column experiments, and the selectivity factor by SIRs may be controlled by the feed concentration [142], feed pH [89], flow rate [138], support property [66], eluent [92,95], extractant composition [52], preparation method [54], as well as by the column size [94].…”

Ultrasound-assisted ionic liquid-based microextraction combined with least squares support vector machines regression for the simultaneous determination of aluminum, gallium, and indium in water and coal samples

“…These methods are difficult to directly determine aluminum, gallium, and indium at very low concentrations because of insufficient sensitivity of this technique as well as the matrix interferences occurring in real samples, and an initial sample pretreatment, such as preconcentration of the analyte and matrix separation, is often necessary (Khan et al 2009). Several methods have been reported for the separation and preconcentration of metal ions, such as liquid-liquid extraction (LLE) (Wang et al 2005), coprecipitation (Prasad et al 2006), solid-phase extraction (Karve and Rajgor 2008), and cloud point extraction (Shariati et al 2008), but the disadvantages such as time-consuming, unsatisfactory enrichment factors, large organic solvents, and secondary wastes, limit their applications. The continuous quest for novel sample preparation procedures has led to development of new methods such as solid-phase microextraction (Mester and Sturgeon 2005), homogeneous liquid-liquid microextraction (LLME) (Takahashi et al 1999), single-drop microextraction (SDME) (Martinis et al 2010), hollow fiber liquid-phase microextraction (Abulhassani et al 2010), and dispersive liquid-liquid microextraction (DLLME) (Mohammadi et al 2009).…”