Sorption of U(VI) ions on sol-gel-synthesized amorphous spherically granulated titanium phosphates

Zakutevskyy, O. I.; Psareva, T. S.; Стрелко, В. В.

doi:10.1134/s107042721209011x

Cited by 19 publications

(6 citation statements)

References 10 publications

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“…As powders, these materials have already been known for a long time [15][16][17][18][19][20][21][22][23]. Further research allowed synthesis of ion exchangers such as a granulated gels, which favorably differ from powders [24][25][26]. Recent studies have allowed increasing the porosity, the selectivity of adsorption and the exchange capacity of such gels to radionuclides and other cationic and anionic contaminants [27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Titanium Silicates Precipitated on the Rice Husk Biochar as Adsorbents for the Extraction of Cesium and Strontium Radioisotope Ions

Zhuravlev¹

2019

Colloids and Interfaces

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The aim of the work was the development of cheap and effective adsorbents based on titanium silicates deposited on the products of thermochemical processing of rice husk to extract cesium and strontium radioisotopes from aqueous media. Synthesis of adsorbents was carried out using the cheapest and widely used titanium water-soluble reagent, titanium sulfate (an intermediate product of white rutile pigment production), as feedstock. After treatment with titanium sulfate and neutralization, hydrothermal treatment was carried out in various ways. The traditional method of processing in an autoclave was used, as well as the blowing at different temperatures by steam. The distribution coefficients and the adsorption capacity for cesium and strontium ions on these sorbents were studied. Along with the chemical composition of adsorbents obtained by those ways, the type and the temperature of hydrothermal treatment also affected the adsorption properties. It was found that the adsorbent obtained by hydrothermal treatment in an autoclave has the highest degree of cesium ions extraction (Kd = 27,500). The highest degree of strontium ions extraction (Kd = 2,095,000) has an adsorbent obtained by hydrothermal treatment with water vapor blowing.

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Section: Introductionmentioning

confidence: 99%

Titanium Silicates Precipitated on the Rice Husk Biochar as Adsorbents for the Extraction of Cesium and Strontium Radioisotope Ions

Zhuravlev¹

2019

Colloids and Interfaces

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“…In this case, UO 2 2+ ions interact with them, since these groups are more acidic. However, deposition of insoluble U(VI) compounds is also possible [ 46 ]. Detailed investigation of sorption mechanism is a task of future investigations.…”

Section: Discussionmentioning

confidence: 99%

“…In order to improve selectivity of strongly acidic resins towards Ni 2+ , Cd 2+ , and Pb 2+ , they were modified with zirconium hydrophosphate (ZHP) [38–44]. The inorganic sorbent shows high selectivity towards toxic cations [45, 46], particularly U(VI) [46, 47] due to formation of complexes with functional groups [48]. Deposition of insoluble U(VI) compounds in ZHP pores is also suggested [46].…”

Section: Introductionmentioning

confidence: 99%

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Formation of Zirconium Hydrophosphate Nanoparticles and Their Effect on Sorption of Uranyl Cations

Perlova

Dzyazko²,

Perlova

et al. 2017

Nanoscale Res Lett

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Organic-inorganic ion-exchangers were obtained by incorporation of zirconium hydrophosphate into gel-like strongly acidic polymer matrix by means of precipitation from the solution of zirconium oxychloride with phosphoric acid. The approach for purposeful control of a size of the incorporated particles has been developed based on Ostwald-Freundich equation. This equation has been adapted for precipitation in ion exchange materials. Both single nanoparticles (2–20 nm) and their aggregates were found in the polymer. Regulation of salt or acid concentration allows us to decrease size of the aggregates approximately in 10 times. Smaller particles are formed in the resin, which possess lower exchange capacity. Sorption of U(VI) cations from the solution containing also hydrochloride acid was studied. Exchange capacity of the composites is ≈2 times higher in comparison with the pristine resin. The organic-inorganic sorbents show higher sorption rate despite chemical interaction of sorbed ions with functional groups of the inorganic constituent: the models of reaction of pseudo-first or pseudo-second order can be applied. In general, decreasing in size of incorporated particles provides acceleration of ion exchange. The composites can be regenerated completely, this gives a possibility of their multiple use.

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“…Therefore, the adsorption of uranyl ions on sodium zirconium phosphate (NaZrP) should be on the basis of a simple ion-exchange mechanism and the mesostructured features, actively inner/outer surface pore and framework of NaZrP. Once, the mesoporous NaZrP contact with the uranyl ions in solution, the hydrogen/sodium ions (active sites) replaced by U ions based on pH values (nZrP-ONa + UO 2+ → (ZrP-O) n -UO +2 + nNa + ) [40].…”

Section: Effect Of Phmentioning

confidence: 99%

Fabrication of Mesoporous NaZrP Cation-Exchanger for U(VI) Ions Separation from Uranyl Leach Liquors

Alhindawy

Elshehy

El‐Khouly

et al. 2019

Colloids and Interfaces

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As the demand for uranium production-based energy worldwide has been increasing in the last decades to maintain nuclear growth for electricity production, there are great efforts towards developing an easy and inexpensive method for uranium extraction and separation from its ores. For this purpose, mesoporous inorganic cation exchangers provide an efficient separation technology that can help streamline production and lower overall cost. This study describes the development of nano-structured mesoporous sodium zirconium phosphate (NaZrP-CEX) for separation and extraction of uranyl ions from real samples. The fabricated NaZrP-CEX was well characterized by various techniques such as X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Scanning Electron Microscope (SEM), N2 adsorption/desorption, Dynamic light scattering (DLS) and zeta potential). The kinetics/thermodynamic behaviors of uranyl ion adsorption into NaZrP-CEX from an aqueous solution were minutely studied. The kinetic studies showed that the pseudo-second order model gave a better description for the uptake process. The negative value of ΔG indicate high feasibility and spontaneity of adsorption. Finally, mesoporous NaZrP-CEX can be regenerated using both of HNO3 (0.05 M) or HCl (1 M) up to seven cycles of operation.

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Sorption of U(VI) ions on sol-gel-synthesized amorphous spherically granulated titanium phosphates

Cited by 19 publications

References 10 publications

Titanium Silicates Precipitated on the Rice Husk Biochar as Adsorbents for the Extraction of Cesium and Strontium Radioisotope Ions

Titanium Silicates Precipitated on the Rice Husk Biochar as Adsorbents for the Extraction of Cesium and Strontium Radioisotope Ions

Formation of Zirconium Hydrophosphate Nanoparticles and Their Effect on Sorption of Uranyl Cations

Fabrication of Mesoporous NaZrP Cation-Exchanger for U(VI) Ions Separation from Uranyl Leach Liquors

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