The effect of surface properties on the uranium adsorption by mesoporous ceria

Paschalidou, Polyxeni; Liatsou, Ioanna; Pashalidis, Ioannis; Theocharis, Charis R.

doi:10.1007/s10967-018-6195-4

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…1 H-and 13 C-NMR spectra were recorded on a Bruker Avance 300 instrument (at 300 and 75 MHz, respectively). 13 C-DEPT NMR was used to identify quaternary and tertiary carbons. Deuterated solvents were used for homonuclear lock and the signals are referenced to the deuterated solvent peaks.…”

Section: Physicochemical Characterization Of Gels and Powdersmentioning

confidence: 99%

Surface properties of ceria synthesised using Triton-X based reverse microemulsions

Paschalidou

Theocharis

2019

RSC Adv.

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The effect of the tail length of Triton-X surfactants on the surface properties of ceria prepared by means of reversed micelles and Ce(O i Pr) 4 has been systematically studied. Generally, solids with increased surface areas (up to 136 m 2 g À1 ) were synthesised. It was shown that the tail length strongly affects the surface characteristics. Further studies were carried out using UV-Vis, ATR-FTIR, XRD and TGA/DSC studies of the precursor gels as well as N 2 -isothermal adsorption BET, XRD, FT-IR, UV-Vis diffuse reflectance and SEM investigations of the final solids samples. An interaction mechanism between the ceria precursor molecules and the polar tail of the reversed Triton X micelles and the formation of ceria (CeO 2 ) particles in the aqueous nucleus of the reversed microemulsions is proposed.

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Section: Physicochemical Characterization Of Gels and Powdersmentioning

confidence: 99%

Surface properties of ceria synthesised using Triton-X based reverse microemulsions

Paschalidou

Theocharis

2019

RSC Adv.

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“…The equilibrium adsorption capacity of the pseudo-first-order kinetic model and the pseudo-second-order kinetic model were 70.71 and 81.82 mg g −1 , respectively. Some studies showed that the maximum adsorption capacity of the adsorption capacity was between the pseudo-first-order and the pseudo-second-order kinetic model [ 33 ]. Further analysis was needed to determine the maximum adsorption capacity.…”

Section: Resultsmentioning

confidence: 99%

U(VI) adsorption in water by sodium alginate modified Bacillus megaterium

Yang

Zhang

et al. 2021

R. Soc. open sci.

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The surface of Bacillus megaterium was modified by coating sodium alginate. The modified B. megaterium before and after adsorption were characterized by SEM, FTIR and XPS. The effects of pH, reaction time, initial U(VI) concentration and adsorbent dosage on the adsorption of U(VI) by the modified B. megaterium were studied by batch adsorption experiments. The adsorption process was studied by pseudo-first-order kinetics and pseudo-second-order kinetic models, Langmuir and Freundlich isotherms. The results showed that the maximum adsorption capacity of U(VI) was 74.61 mg g −1 under the conditions of pH 5.0, adsorbent 0.2 g l −1 , 30°C and initial U(VI) concentration of 15 mg l −1 . The adsorption process accords with pseudo-first-order kinetics and Langmuir isotherm. The adsorption capacity of U(VI) by the modified B. megaterium was still higher than 80% after five times of desorption and reuse experiments. In conclusion, the sodium alginate modified B. megaterium was an ideal material for U(VI) biosorption.

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“…42,44,45,47 Moreover, the quite unique ability of CeO 2 to easily cycle between +3 and +4 oxidation states together with the generation of oxygen vacancies is an appealing property that could be used during the adsorption process to enhance the efficacy and selectivity of adsorbents. For example, cerium oxides nanocrystals were found to effectively capture U(VI) from aqueous streams, [47][48][49] and this was attributed to the mixed surface valence, varying morphology and geometry of CeO 2 nanoparticles. 47 However, despite the known physicochemical similarity between actinides such as U(VI) and lanthanides, which would suggest a similar uptake from CeO 2 , very few studies on the adsorption of REEs by CeO 2 nanoparticles were carried out so far.…”

Section: Introductionmentioning

confidence: 99%

Recovery of rare earth elements by nanometric CeO₂ embedded into electrospun PVA nanofibres

et al. 2021

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The effect of surface properties on the uranium adsorption by mesoporous ceria

Cited by 11 publications

References 16 publications

Surface properties of ceria synthesised using Triton-X based reverse microemulsions

Surface properties of ceria synthesised using Triton-X based reverse microemulsions

U(VI) adsorption in water by sodium alginate modified Bacillus megaterium

Recovery of rare earth elements by nanometric CeO₂ embedded into electrospun PVA nanofibres

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The effect of surface properties on the uranium adsorption by mesoporous ceria

Cited by 11 publications

References 16 publications

Surface properties of ceria synthesised using Triton-X based reverse microemulsions

Surface properties of ceria synthesised using Triton-X based reverse microemulsions

U(VI) adsorption in water by sodium alginate modified Bacillus megaterium

Recovery of rare earth elements by nanometric CeO2 embedded into electrospun PVA nanofibres

Contact Info

Product

Resources

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Recovery of rare earth elements by nanometric CeO₂ embedded into electrospun PVA nanofibres