The Formation of a Third Phase in Ytterbium Extraction Chromatography Columns with HDEHP

Bobrovskaya, K. S.; Kuznetsov, R. A.; Fomin, A. N.

doi:10.1134/s106636222205006x

Cited by 4 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The result proved that the copolymer was loaded in the channel of SiO2. Compared with SiPS, HDEHP@SiPS showed the characteristic peaks of -CH3 and -CH2-, which were located at 2960 cm − 1 , 2929 cm − 1 , 2866 cm − 1 , 1460 cm − 1 , and 1380 cm − 1 [38]. The results suggested that HDEHP was successfully impregnated in SiPS.…”

Section: Characterizationmentioning

confidence: 90%

Preparation and characterization of a mesoporous silica-based copolymer loaded with bis(2-ethylhexyl) phosphate for the efficient separation of trace radium from natural thorium

He,

Liao,

Tang

et al. 2024

Preprint

View full text Add to dashboard Cite

Targeted α-nuclide therapy (TAT) has attracted significant attention in recent years due to its unique advantages in cancer treatment. As one of the most important TAT nuclides, 212Pb is quite rare and strongly depends on the supply of its parent nuclides with an appropriate half-life, such as 228Ra or 224Ra. Therefore, establishing a stable and effective method to obtain these nuclides is critical. To address this issue, a silica-supported copolymer loaded with bis (2-ethylhexyl) phosphate (HDEHP) was prepared, characterized, and investigated for the separation of 228Ra and 224Ra from natural 232Th in the nitric acid media. The experimental results showed that the adsorbent was prepared successfully with 19.5 wt% HDEHP loading, and possessed a small particle size and a porous structure. Compared with traditional cation exchange resin, the adsorbent exhibited ultrahigh selectivity and ultrafast adsorption kinetics towards thorium, with the equilibrium time less than 3 min. The adsorption isotherm was well described by the Langmuir model, and the maximum adsorption amount towards thorium could reach 72.0 mg/g. Thermodynamic investigations suggested that the thorium adsorption was endothermic and spontaneous. On basis of batch experiments, the separation behaviors were further investigated in column modes, and the separation of 228Ra and 224Ra from thorium was finally demonstrated using 226Ra as the tracer nuclide. The chemical recovery rate to 226Ra reached 96.7%, and the decontamination factor to thorium exceeded 105. The spectroscopic assessment suggested that the adsorbed species was mainly the positive Th4+ cation and almost no barium and nitrate ions were involved. The adsorption mechanism was dominated by compounding with oxygen in P-O-H and P=O groups. This work exhibited an excellent material and an efficient method for separating 228Ra and 224Ra from natural thorium, rendering it particularly significant in the future preparation and application of 212Pb.

show abstract

Section: Characterizationmentioning

confidence: 90%

Preparation and characterization of a mesoporous silica-based copolymer loaded with bis(2-ethylhexyl) phosphate for the efficient separation of trace radium from natural thorium

He,

Liao,

Tang

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…3, the broad and strong peak in 3433 cm − 1 https://doi.org/10.26434/chemrxiv-2024-3c9cq ORCID: https://orcid.org/0000-0002-3053-9678 Content not peer-reviewed by ChemRxiv. License: CC BY-NC-ND 4.0 resulted from the stretching vibrations of -OH of the adsorbed water molecules [28]; the peaks at 2968 and 2931 cm − 1 were the characteristic peaks of -CH3 and -CH2-, respectively [29]; the strong peak at 1624 cm − 1 was the characteristic peak of the conjugated alkene double bonds on the aromatic rings [30]; the peaks at 760 and 670 cm − 1 were attributed to the bending vibrations of the C-H bond. Except for the above peaks, the characteristic peak of NO3 − was also observed at 1380 cm − 1 [31], suggesting that the IRA900 resin was successfully transformed into nitrate-type, with NO3 − anions as the counter ions.…”

Section: Characterizationmentioning

confidence: 99%

Method and mechanism for efficient radium isolation from bulk thorium based on anion exchange

He,

Tang,

Wang

et al. 2024

Preprint

View full text Add to dashboard Cite

In recent years, targeted-α-nuclide therapy (TAT) has been widely concerned in the world. As one of the few representative TAT nuclides, 212Pb has shown good efficacy in cancer treatment; however, the amount remains scarce. Separating 228Ra and 224Ra from 232Th is expected to fundamentally solve this issue. In this work, a novel and effective method for trace radium isolation from bulk thorium was proposed and verified through a systematic investigation of the adsorption behaviors of an anion exchanger denoted IRA900 toward thorium and barium/radium. Batch experiments suggested that IRA900 had unique selectivity for thorium in nitric acid solution, with almost no barium adsorbed. The thorium adsorption performance kept improving with increasing concentration of nitric acid and decreasing temperature. The IRA900 resin required about 8 h to reach adsorption equilibrium, and the estimated maximum adsorption capacity toward thorium was about 254 mg/g. The adsorption kinetics and adsorption isotherm could be well fitted by the pseudo-second-order kinetic model and the Langmuir model, respectively. Column experiments suggested that thorium could be effectively immobilized by a column packed with IRA900, while barium was directly penetrated. For desorbing the fixed thorium, 0.1 M HNO3 was optimal. A final hot test demonstrated the successful radium isolation from bulk thorium, with high chemical yield and purity. The selective separation mechanism was attributed to the formation of an anionic [Th(NO3)5]− complex, while barium or radium existed in the cationic form in any nitric acid concentration. This work provides a promising method for separating trace radium from natural thorium, which will be significant for promoting the large-scale utilization of 212Pb.

show abstract

Preparation and characterization of a mesoporous silica-based copolymer loaded with bis(2-ethylhexyl) phosphate for the efficient separation of trace radium from natural thorium

He,

Liao,

Tang

et al. 2024

J Radioanal Nucl Chem

View full text Add to dashboard Cite

The Formation of a Third Phase in Ytterbium Extraction Chromatography Columns with HDEHP

Cited by 4 publications

References 8 publications

Preparation and characterization of a mesoporous silica-based copolymer loaded with bis(2-ethylhexyl) phosphate for the efficient separation of trace radium from natural thorium

Preparation and characterization of a mesoporous silica-based copolymer loaded with bis(2-ethylhexyl) phosphate for the efficient separation of trace radium from natural thorium

Method and mechanism for efficient radium isolation from bulk thorium based on anion exchange

Preparation and characterization of a mesoporous silica-based copolymer loaded with bis(2-ethylhexyl) phosphate for the efficient separation of trace radium from natural thorium

Contact Info

Product

Resources

About