Amberlite XAD-2010 Impregnated with Chrome Azurol S for Separation and Spectrophotometric Determination of Uranium and Thorium

Abstract

A new extractant-impregnated resin (EIR), chrome azurol S-impregnated on XAD-2010, is used as an adsorbent to separate and preconcentrate U(VI) and Th(IV) ions prior to their spectrophotometric determination. Various instrumental techniques such as elemental analysis, FTIR, and SEM analysis were employed for full characterization of the synthetic extractant. Optimization of the adsorption and elution conditions of U(VI) and Th(IV) ions using synthesized chrome azurol S-impregnated XAD-2010 were studied. Langmuir isotherm model has the best fitting experimental data with a maximum adsorption capacity of 23.8 mg g −1 for U(VI) and 25.4 mg g −1 for Th(IV). The adsorption process of each metal ion using synthesized chrome azurol S-impregnated XAD-2010 showed an exothermic pseudo-second-order adsorption process. High tolerance limits for several studied metal ions on chrome azurol S-impregnated XAD-2010 were observed. The optimized method was applied on an international certified samples and different rock types bearing thorium and uranium with accurate results.

An effective uranium removal using diversified synthesized cross-linked chitosan bis-aldehyde Schiff base derivatives from aqueous solutions

“…Also, the crystals of salt occupy the superficial area of the adsorbents at high salt concentrations, which diminish the adsorbent available to interact with the analytes and play a very negative role by decreasing the recovery. The same behavior agrees with that reported earlier using other adsorbents (Hosseini-Bandegharaei et al 2013;Fouad et al 2019;Orabi et al 2019). The absorption on three adsorbents of U(VI) increased when the pH of the adsorption media raised and reached a maximum at pH 3-5.…”

“…Fig. 12 Effect of contact time on U(VI) adsorption by CBASB derivatives (m:V = 0.05 g/25 mL; C 0 [U(VI)] = 100.00 ± 0.10 mg/L; pH = 3.00 ± 0.05; T = 298.00 ± 1.00 K) groups in the Cs-BFPA structure, which have high extractive power, stability, and effective reagent for the separation of uranium from diversified media (Coleman et al 1958;Crane et al 2010;Zhu and Cheng 2011;Orabi et al 2015).…”

“…The separation factors of U to impurities using Cs-BFPA are much higher than those with other CBASB derivatives (Cs-BFB and Cs-BODB). This may be due to the presence of amine groups in Cs-BFPA, which have high extractive power, stability, selectivity, and effective reagent for the separation of uranium from diversified media (Coleman et al 1958;Crane et al 2010;Zhu and Cheng 2011;Orabi et al 2015).…”