Abstract
The batch technique was used to study the adsorption of La(III), Eu(III), Lu(III), and U(VI) ions on sepiolite and ODTMA–sepiolite under ambient conditions. The effects of pH, time, and initial concentration were investigated. The highest U(VI) adsorption was found on ODTMA-sepiolite in the pH range of 6–8, while in the case of lanthanide ions, adsorption on sepiolite was 80% in the pH range of 4–8 and 98% for pH values above 8. The adsorption capacity of ODTMAsepiolite was found to be 285.6 mg/g for uranium, and raw sepiolite: 142.8 mg/g for U(VI), 91.6 mg/g for La(III), 91.4 mg/g for Eu (III), and 104.9 mol/g for Lu(III). ODTMA–sepiolite turned out to be a weak sorbent for lanthanide ions. Two short- and long-lived fluorescence species were observed in the TRLFS spectra of U(VI) adsorbed on sepiolite at pH 6.5. The average lifetimes of short- (τ1) and long-lived (τ2) fluorescence are τ1 = 2420 ± 430 ns and τ2 = 37950 ± 5710 ns for U-sepiolite; τ1 = 3523 ± 160 ns and τ2 = 45400 ± 1830 ns for U-ODTMA–sepiolite.
Highlights
Uranium, an actinide element, is of significant importance in the fuel cycle, beginning as a source and ending up as the final waste component
A comparison of sepiolite before and after ion adsorption concludes that there is a significant decrease in the surface area of micropores and volume, total pore volume, and BET surface area during clay modification using the ODTMA-Br solution
The values of total pore volume and average pore diameter diminished, which was attributed to the adsorption of uranium ions: UO2 2+
Summary
An actinide element, is of significant importance in the fuel cycle, beginning as a source and ending up as the final waste component. Anthropological sources of U contamination fall into three categories: originating from weapon production, nuclear energy, and various other uses [1]. Uranium occurs in both seawater and a large number of rocks with 2 to 4 parts per million concentrations in the Earth’s crust. The methods of uranium(VI) ions removal—adsorption, solvent extraction, or ion exchange for U(VI) purification from waste waters—have been recently elaborated upon. Adsorption based on metal oxides [2]—activated carbon [3] aluminosilicates [4,5,6] as adsorbents—is the most common method of uranium removal in aquatic environments.
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