Uranium adsorption from Bahariya Oasis leach liquor via TOPO impregnated bentonite material; Isothermal, kinetic and thermodynamic studies

Masoud, Ahmed M.; Saeed, Muhammad; Taha, Mohamed; El-Maadawy, M. M.

doi:10.21608/ejchem.2019.13638.1843

Cited by 13 publications

(4 citation statements)

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“…Indeed, leaching methods remain the most used techniques for the extraction (solid->liquid transfer) of metals from low-grade ores. In the liquid phase, the metals may be recovered by precipitation [3], mineral sorbents [4][5][6][7][8], agricultural wastes [9], functionalized composites [10,11], solvent extraction [1,12], activated carbon [13] or carbonized biomass [14], membrane processes [15], impregnated resin [16] or ion-exchange and chelating resins [17][18][19][20][21][22], depending on the composition of the leachates, the concentration of metals, and the flux of the effluent. Usually, sorption processes are preferred for the treatment of dilute solutions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Hassanein

Masoud

Mohamed

et al. 2021

Journal of Environmental Chemical Engineering

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Polyamide (PA6) and hydroxyapatite (n-HAp) have intrinsic sorption properties for metal ions. Their association by melt compounding allows manufacturing a composite material (PA6/n-HAp) efficient for the binding of uranyl and rare earth metal ions (REEs) in acidic solution (in the pH range 2-2.5). The composite shows enhanced sorption capacities (5-7 times) compared with single PA6 material. The structuration of the material slightly improves textural properties but contributes to improve the accessibility and availability of reactive groups (including by size distribution). Metal sorption proceeds mainly through complexation of amide reactive groups as shown by FTIR characterization (modification of the environment of C --O and NH groups) rather than ionexchange/electrostatic attraction. Maximum sorption capacities approach 0.34 mmol U g − 1 , 0.49 mmol Er g − 1 and 0.70 mmol Nd g − 1 : the preference may be correlated to the covalent rather than ionic character of these metal ions. Uptake kinetics are relatively slow (requiring up to 6− 8 h, under selected experimental conditions): the textural properties of the composite (pore size: 2.6 nm) limit the mass transfer properties (though slightly enhanced compared with PA6 precursor). The resistance to intraparticle diffusion constitutes the major con-trolling step for uptake kinetics. Nitric acid is the most efficient eluent for the desorption of loaded metals (ef-ficiency exceeds 94 %); noticeably U(VI) elution is optimal at 1 M HNO 3 concentration, contrary to REEs that require lower concentration (i.e., 0.1 M). Preliminary tests on sulfuric acid leachates of Egyptian ores demon-strate that the sorbent maintains good sorption properties for REEs and U despite the complexity of the solution. The sorbent has a marked preference for REEs, U and Th against base and alkali metals.

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Section: Introductionmentioning

confidence: 99%

Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Hassanein

Masoud

Mohamed

et al. 2021

Journal of Environmental Chemical Engineering

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“…Adsorption equilibrium was established when the amount of compound adsorbed onto the material was equal to the amount desorbed. There were several isotherm equations available for analyzing experimental adsorption equilibrium data, including the Freundlich, Langmuir, Temkin, and so on [46,47]. There was a nonlinear relationship between the adsorption amount of flutriafol (q e (mg•L −1 )) and the equilibrium concentration (C e (mg•L −1 )) in the solution at different temperatures.…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

Cyclodextrin Polymer-Loaded Micro-Ceramic Balls for Solid-Phase Extraction of Triazole Pesticides from Water

Yang,

Yu,

Chen

et al. 2024

IJMS

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A citric acid cross-linked β-cyclodextrin (β-CD) polymer was synthesized and loaded on micro-ceramic balls to fabricate the solid-phase adsorbents (P-MCB) for adsorption and extraction of triazole pesticides from water. The stability of β-CD polymer and P-MCB was investigated in solutions with different pH values at different temperatures. The adsorption properties and the influence of kinetics, sorbent amount, pesticide concentration, and temperature on the adsorption capacity were evaluated. The results showed P-MCB had favorable adsorption of 15.98 mg/g flutriafol in 3.5 h. The equilibrium data followed the Freundlich equation, and the adsorption of flutriafol and diniconazole followed the second-order kinetics. The recovery rate of P-MCB for triazole pesticides in water was satisfactory, and the recovery rate was still 80.1%, even at the 10th cycle. The P-MCB had good stability, with a degradation rate of 0.2% ± 0.08 within 10 days, which could ensure extraction and recycling.

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“…The removal of U(VI) from liquid solutions has been accomplished using a variety of techniques, including membrane separation (Torkabad et al n.d.), co-precipitation (Dinis et al n.d.), ion exchange (Chen et al n.d.;Naushad et al 2015), electrocoagulation (Nariyan et al n.d.), solvent extraction (Ali et al 2014), solid-phase extraction (Massoud et al 2019;Morsy et al 2019a; H. Wang et al n.d.;Walid Mohamed Youssef 2022), and adsorption (Ali et al 2019;El-Maadawy 2019;Masoud et al 2020aMasoud et al , 2020b; W. M. Youssef et al 2022a). Among these established methods, research has demonstrated that adsorption is exceptionally effective in eliminating solutes using selective adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Uranium capture from aqueous solution using Palm-waste based activated carbon: sorption kinetics and equilibrium

Youssef,

El-Maadawy,

Masoud

et al. 2023

Preprint

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In this research, we examined the effectiveness of adsorbents derived from commercially available palm kernel shell bio-char (PBC), as well as palm shell carbon that was activated through treatment with H2SO4 (PBC-SA) and ZnCl2 (PBC-Zn). Our primary objective was to enhance the adsorption capabilities of carbon materials and develop efficient sorbents for the removal of uranium ions from aqueous solutions. To gain insight into the characteristics of these materials, we employed various analytical techniques, including SEM, EXD, BET, FTIR, and Zeta potential. The optimization of the adsorption process involved the careful consideration of key parameters such as pH, contact time, adsorbent dosage, and initial metal ion concentration. Under specific conditions, including a pH level of 4.5, a contact time of 60 minutes, an adsorbent dosage of 10.0 g/L, and an initial metal concentration of 50 mg/L, the adsorbent materials PBC, PBC-SA, and PBC-Zn demonstrated uranium ion sorption capacities of 9.89 mg/g, 16.81 mg/g, and 21.93 mg/g, respectively. The kinetics of the adsorption process were analyzed using three models: the pseudo first-order model, the pseudo second-order model, and the intraparticle diffusion model. Our findings indicated that the pseudo second-order kinetics model provided the most suitable description of the uranium adsorption onto the prepared materials. Furthermore, the adsorption isotherm data were consistent with the Langmuir model, suggesting that the adsorption of uranium ions onto all materials followed a monolayer adsorption mechanism. Lastly, thermodynamic analysis revealed that the adsorption process was spontaneous and exothermic in nature.

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Uranium adsorption from Bahariya Oasis leach liquor via TOPO impregnated bentonite material; Isothermal, kinetic and thermodynamic studies

Cited by 13 publications

References 0 publications

Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Cyclodextrin Polymer-Loaded Micro-Ceramic Balls for Solid-Phase Extraction of Triazole Pesticides from Water

Uranium capture from aqueous solution using Palm-waste based activated carbon: sorption kinetics and equilibrium

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