Encapsulation of ammonium molybdophosphate for removal of selected radionuclides from multicomponent solution in a fixed-bed column

Rizk, Hoda E.; Abou-Lilah, Riham A.; Elshorbagy, Mostafa A.; Gamal, Ahmed; Badawy, Nagwa A.; Ali, Abdallah

doi:10.1080/03067319.2022.2130689

Cited by 2 publications

(2 citation statements)

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“…By comparison between the data obtained from bath and column techniques, it can be concluded that the S% and L% values, in addition to, the amount of metal ions yield, i.e., desorbed (D) or eluted (E) were varied. This result may be due to the variations in their experimental conditions, in which there are no agitation, stirring and/or equilibrium in column technique Th 4+ and Zr 4+ admixture using IR120H resin (Rizk et al 2022a). The amounts of metal ions separated by batch and column techniques are reported in Fig.…”

Section: Column Techniquementioning

confidence: 99%

“…The disadvantages of the precipitation method are that more time is spent in digest, filtering, or washing and disposal the precipitates, limited recovery of rare earths, highly dependent on pH that Ln 3+ can co-precipitate with Th and U with any error in the detection of the pH value, and pollution from the storage of radioactive precipitate (Ang et al 2018;Wang et al 2013). On the other hand, the ion exchange technique is the most suitable separation technique due to its non-complication as associated with solvent extraction due to less use of organic solvent and less waste accumulation (Mayyas et al 2014;Rizk et al 2022a;Rodríguez et al 2016;Shu et al 2018;Zhang et al 2004) and overcomes the traditional precipitation method problems, as well as the ability of ion exchangers and chelating resins to extract Ln 3+ from dilute solution (Esma et al 2014). Monazite is the main source of lanthanides and thorium in the world.…”

Section: Introductionmentioning

confidence: 99%

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Selective separation and purification of cerium (III) from concentrate liquor associated with monazite processing by cationic exchange resin as adsorbent

et al. 2023

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The present study is directed to find the optimal conditions required for efficient separation and purification of Ce3+ as an analog for lanthanides from Fe3+, Th4+, and Zr4+ (interfering ions) using Amberlite IR120H (AIR120H) resin as a strongly cationic exchange adsorbent. The main factors affecting the separation processes had been investigated and optimized. Ce3+ (Ln3+) as an admixture with Fe3+, Th4+, and Zr4+ was successfully separated by batch and column techniques. The sorption efficiency (S, %) from different acidic media was in this order: HCl > HNO3 > H2SO4. In a quaternary mixture with Fe3+ and Th4+, the maximum separation factor between Ce3+ and Zr4+ was ~ 13 after 90 min of equilibration, and the sorption capacity of AIR120H resin for Ce3+ was 8.2 mg/g. The rate of adsorption was found to follow a pseudo-second-order kinetic model. Separation of the absorbed ions was achieved by desorption processes. Firstly, 98 ± 2% of loaded Ce3+ is fully desorbed by 1 M sodium acetate solution without interfering ions. Moreover, ~ 95% of Zr4+ is desorbed by 1 M citric acid solution. Finally, 85% of loaded Fe3+ and Th4+ ions are desorbed with 8 M HCl solution. The batch technique was applied to separate and purify Ln3+-concentrate in chloride liquor (LnCl3), coming from the caustic digestion of Egyptian high-grade monazite. However, the enhanced radioactivity in LnCl3 due to radium -isotopes (228Ra2+, 226Ra2+, 224Ra2+, 223Ra2+) and radio-lead (210Pb2+) is initially reduced by a factor of 92% (i.e., safe limit) by pH-adjustment. As result, it can be recommended that the sorption process by AIR120H resin is efficient and promising for exploring pure lanthanides from its minerals.

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Section: Column Techniquementioning

confidence: 99%