Carbon materials for extraction of uranium from seawater

Guo, Han; Peng, Mei Mei; Xiao, Jin; Huang, Xingshui; Ishag, Alhadi; Sun, Yubing

doi:10.1016/j.chemosphere.2021.130411

Cited by 79 publications

(26 citation statements)

References 129 publications

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“…The variation of energy during the adsorption process was investigated through calculating the thermodynamic parameters. The linear regression plotting of ln K c vs. 1/T according to eqn (11) enables the calculation of enthalpy (DH ) and entropy (DS ) from the plot slope and the intercept, respectively. The Gibbs free energy (DG ) can be calculated using eqn (12): 28,36 ln…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

“…Over the last decades, developing efficient uranium adsorbents has been a research focus. Numerous organic and inorganic materials have been developed and assessed for their affinity towards uranium such as amidoxime-based, 10 carbon-based, 11 biochar-based, 12,13 metal organic frameworks-based, 14 covalent organic frameworks-based composites 15,16 and nanocomposites. 17 Among them, nanometric scale adsorbents are of particular concern due to their inimitable properties, as they have high specific surface area, elevated reactivity, high adsorption efficiency and capacity, fast adsorption rate, and acceptable reusability.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical and experimental studies on uranium(vi) adsorption using phosphine oxide-coated magnetic nanoadsorbent

Akl

2021

RSC Adv.

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Section: Adsorption Thermodynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental studies on uranium(vi) adsorption using phosphine oxide-coated magnetic nanoadsorbent

Akl

2021

RSC Adv.

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“…Processes based on solid-phase extractants such as ion exchange and the resin-in-pulp process are already used in the uranium industry, but improved SPE supports are required to manage more highly concentrated leaching solutions and to increase selectivity [ 3 ]. A well-investigated SPE strategy for the removal of uranium ions from aqueous effluents has been to functionalize metal oxide particles [ 6 ], mesoporous silica [ 7 , 8 ], carbon supports [ 9 , 10 , 11 ], MOFs [ 12 , 13 ], fibers [ 14 , 15 ] and resins [ 3 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Impregnated Amidophosphonate Ligand Concentration on the Uranium Extraction Behavior of Mesoporous Silica

2022

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A series of solid-phase uranium extractants were prepared by post-synthesis impregnation of a mesoporous silica support previously functionalized with octyl chains by direct silanization. Five materials were synthesized with 0, 0.2, 0.3, 0.4 and 0.5 mmol of the amidophosphonate ligand DEHCEBP per gram of functionalized solid, and the effect of the ligand concentration on the uranium extraction efficiency and selectivity of the materials was investigated. Nitrogen adsorption–desorption data show that with increasing ligand loadings, the specific surface area and average pore volume decrease as the amidophosphonate ligand fills first the micropores and then the mesopores of the support. Acidic uranium solutions with a high sulfate content were used to replicate the conditions in ore treatment leaching solutions. Considering the extraction kinetics, the equilibration time was found to increase with the ligand concentration, which can be explained by the clogging of micropores and the multilayer arrangement of the DEHCEBP molecules in the materials with their highest ligand contents. The fact that the equilibrium ligand/uranium ratio is about 2 mol/mol regardless of the ligand concentration in the material suggests that all the ligand molecules remain accessible for extraction. The maximum uranium extraction capacities ranged from 30 mg∙g−1 at 0.2 mmol∙g−1 DEHCEBP to 54 mg∙g−1 in the material with 0.5 mmol∙g−1 DEHCEBP. These materials could therefore potentially be used as solid-phase uranium extractants in acidic solutions with high sulfate concentrations.

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“…24 High adsorption kinetics, excellent selectivity and reusability of carbon family materials like activated carbon, mesoporous carbon, carbon nanotubes, nanobers, and graphene oxide make them effective adsorbents for uranium remediation. [25][26][27][28][29] Carbon based nanomaterials have been widely used as adsorbents owing to the presence of different oxygenated functional groups and large specic surface area. High efficiency and simultaneous in situ monitoring of adsorption by luminescent mesoporous silica-carbon dots composite material has been reported.…”

Section: Introductionmentioning

confidence: 99%

Prospective application of phosphorylated carbon nanofibers with a high adsorption capacity for the sequestration of uranium from ground water

2022

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Carbon materials for extraction of uranium from seawater

Cited by 79 publications

References 129 publications

Theoretical and experimental studies on uranium(vi) adsorption using phosphine oxide-coated magnetic nanoadsorbent

Theoretical and experimental studies on uranium(vi) adsorption using phosphine oxide-coated magnetic nanoadsorbent

Effects of Impregnated Amidophosphonate Ligand Concentration on the Uranium Extraction Behavior of Mesoporous Silica

Prospective application of phosphorylated carbon nanofibers with a high adsorption capacity for the sequestration of uranium from ground water

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