Comparison of sorption behavior of Th(IV) and U(VI) on modified impregnated resin containing quinizarin with that conventional prepared impregnated resin

Preconcentration and determination of ultra-trace amounts of U(VI) and Th(IV) using titan yellow-impregnated Amberlite XAD-7 resin

“…A further study revealed that adsorbed U(VI) and Th(IV) ions on the EIR column can be sequentially eluted with 5 mL of 0.5% (w/v) Na 2 CO 3 and 5 mL of 2.0 M HCl. In addition, it is very suitable for rapid preconcentration of uranium and thorium from large volumes of aqueous solutions up to 3 L. Also, in comparison with other SPE methods [16,26,27,29,[41][42][43][44]51,52], the present method has high preconcentration factors, good RSD and very low detection limits. The results also indicated that samples with complicated matrices like seawaters could be analysed successfully by the presented method since matrix ions can be easily eliminated.…”

“…In the last years, our research group has conducted some studies dealing with the adsorption of uranium and thorium ions by various EIRs [41][42][43][44][45]. In continuation of these studies, the present study is directed towards the impregnation of Amberlite XAD-7 resin with titan yellow (TY) (Figure 1) which is a triazene dye used as a stain and fluorescent indicator in microscopy.…”

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

“…Hosseini and Hosseini-Bandegharaei [130] selectively extracted Th(IV) over U(VI) and other co-existing ions with a preconcentration factor of 100 using eosin B-impregnated Amberlite IRA-410 resins. Besides, the sorption behavior of Th(IV) and U(VI) on a modified impregnated resin and a conventionally prepared impregnated resin were compared [131]. Modified SIRs were generated using modified XAD-16 beads whose benzene rings are nitrated by a mixture of HNO 3 and H 2 SO 4 , providing some benefits such as faster rate of equilibrium, higher capacity, and sorption rate as well as more recycling times for enrichment of Th(IV) and U(VI) ions in comparison with conventionally prepared SIRs.…”

“…The fact that the experimental data fit the Langmuir isotherm very well may indicate the homogeneous distribution of extractant molecules or active chelating sites on the surface of polymeric supports [131]. The fitting of the sorption as the Freundlich isotherm suggests that the sorption process is not restricted to one specific class of sites and assumes that the adsorption of metal ions occurs on a heterogeneous surface by monolayer sorption [29].…”

Selective solid-phase extraction of uranium by salicylideneimine-functionalized hydrothermal carbon

“…Being an effective separation technique, solid-phase extraction (SPE) has risen to the forefront among the methodologies that have been extensively studied in the field of separation and analysis [5,6], and is providing alternative opportunities for the removal of hazardous species from wastewater, such as cadmium [7,8], lead [8,9], and chromium [10][11][12], as well as precious metals like gold [13,14] and platinum [15], including uranium [5,16,17]. SPE is arguably powerful in terms of its superiorities of minimal solvent consumption, flexibility, absence of emulsion [5,6,18], especially Nomenclature b L Langmuir constant related to adsorption energy (L mmol −1 ) b T Temkin constant related to adsorption energy (kJ mol −1 ) c 0 initial concentration of metal ion in solution (mmol L −1 ) c e concentration of metal ion at equilibrium in solution (mmol L −1 ) c t concentration of metal ion at time 't' in solution (mmol L −1 ) E DR Dubinin-Radushkevich constant related to mean adsorption energy (kJ mol −1 ) K F Freundlich constant related to adsorption capacity (mmol 1−(1/n) L 1/n g −1 ) K T Temkin equilibrium binding constant (L mmol −1 ) m adsorbent amount (mg) n F Freundlich constant related to adsorption intensity (unitless) q DR Dubinin-Radushkevich saturated adsorption capacity (mmol g −1 ) q e adsorption amount of metal ion at equilibrium (mmol g −1 ) q e,cal adsorption amount of metal ion at equilibrium calculated from kinetic model (mmol g −1 ) q L Langmuir saturated monolayer adsorption capacity (mmol g −1 ) q t adsorption amount of metal ion at time 't'…”