Effective sorption of U(VI) from chloride solutions using zirconium silico-tungstate matrix

Eliwa, Ahmed A.; Mubark, Amal E.

doi:10.1080/03067319.2021.1921762

Cited by 12 publications

(2 citation statements)

References 45 publications

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“…The three models were represented as following in Eqs. (2-4) [32][33][34]. q e : the equilibrium adsorption capacity, q t : the adsorption capacity at time t, k 1 , k 2 , and K i : the reaction rate constants for the PFO, PSO, and intraparticle diffusion models.…”

Section: Adsorption Isotherms Kinetics and Thermodynamicsmentioning

confidence: 99%

Synthesis, Characterization, and Potential Evaluation of Modified Cellulose Immobilized with Hydroxyquinoline as a Sorbent for Vanadium Ions

et al. 2022

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A considerable increase in the importance of vanadium globally and its common uses in many manufacturable alloys made it a target for much scientific research interested in extraction and recovery. A solid modified cellulose sorbent (GCIHQ) was prepared by simple grafting of cellulose, then immobilized with hydroxyquinoline, and examined as a sorbent for V(V) ions. FT-IR, TGA, BET, and SEM–EDX investigations were used to characterize the GCIHQ. A higher surface area for the synthesized GCIHQ resin has been recorded (65.8 m2/g) more than the used cellulose (21.7m2/g). Several vanadium sorption parameters using the modified GCIHQ from the sulfate medium were optimized namely contact time, pH, initial vanadium ions concentration, sorbent dose, and sorption temperature. The kinetics results revealed that the sorption of vanadium ions upon the synthesized sorbent followed the pseudo-second-order with R2 of > 0.99, which indicated that the sorption mechanism was chemical interaction. The sorption process was studied using Freundlich, Langmuir, Dubinin–Radushkevich, and Temkin isotherm models to describe the adsorbent-adsorbate interaction. The Langmuir model was the most fitting model with the experimental results; the experimental adsorption uptake of 113 mg/g was matched with that of the calculated results. The activation energy (Ea) for adsorption was 12.91 kJ.mol−1, indicating the process is to be chemisorption. Thermodynamic characteristics with ΔH of 13.46 kJ/mol and a ΔS 115.15 J/mol.K revealed the endothermic and spontaneous nature.

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Section: Adsorption Isotherms Kinetics and Thermodynamicsmentioning

confidence: 99%

Synthesis, Characterization, and Potential Evaluation of Modified Cellulose Immobilized with Hydroxyquinoline as a Sorbent for Vanadium Ions

et al. 2022

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“…Zirconium has excellent thermal and mechanical properties, which make it suitable for many different applications like painting, glazes, dyes in the ceramic industry, refractory materials, smelting molds, and organic catalysts (Biswas et al 2012 ; Rajmane et al 2006 ). In addition to its application in the nuclear industry as a covering material for the fuel rods in nuclear reactors due to its low neutron capture cross-section, some zirconium compounds, such as zirconium phosphate and zirconium silico-tungstate, could be used to remove uranium from nuclear waste solutions (Ali 2018 ; Eliwa and Mubark 2021 ). Due to all of these applications in various fields, scientists are looking for various chemical techniques for extracting zirconium from its concentrates.…”

Section: Introductionmentioning

confidence: 99%

Zirconium preconcentration from zircon raffinate using gamma radiation–induced polymerization of reduced graphene oxide composite

Ali

Abdo

El-Shazly

2023

Environ Sci Pollut Res

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Zirconium is commonly used as a cladding material for nuclear reactors. The purity of the zirconium material seeks to control reactor efficiency. A novel composite of reduced graphene oxide–grafted polyacrylic acid, malic acid, and trioctylamine (rGO-g-PAA-MA/TOA) was prepared using in situ radical polymerization with gamma radiation at a dose of 25 KGy from a 60Co cell to preconcentrate zirconium Zr(IV) from zircon raffinate. Five distinct rGO-g-PAA-MA/TOA composite compositions were created and evaluated. The best composite composition was 62.95% acrylic acid, 15.8% malic acid, and 15.8% trioctylamine. After 60 min, the sorption reaction reached equilibrium at pH 0.35 and 20 °C. The pseudo nth order indicated that the order of the sorption reaction was 1.8476. The Elovich model and Dubinin-Radushkevich model controlled the kinetic mechanism and adsorption isotherm of the sorption reaction, respectively; based on estimated regression plots and quantitatively with three different error functions: coefficient of determination (R2), chi-square statistic (χ2), and corrected Akaike information (AICc). The adsorption capacity of rGO-g-PAA-MA/TOA was 75.06 mg g−1. Exothermic reaction and spontaneous sorption took place. Using 2 M H2SO4, 98% of the zirconium was efficiently desorbed. The separation of contaminated Ti(IV) from desorbed Zr(IV) by raising pH to 2.5 through hydrolysis and ZrO2 formation.

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Efficacious Recovery of Zirconium and Yttrium Ions from Effluents Using a Gamma-Irradiated Reduced Graphene Oxide Polymeric Composite

Eliwa

2023

J Inorg Organomet Polym

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There are many great uses for heavy elements that are expanding daily and generating enormous amounts of effluents. Therefore, tremendous scientific efforts in removing, recovering, and recycling them are carried out to prevent these harmful effects on the environment and human health. The polyacrylic-carboxymethyl cellulose-trioctyl amine/reduced graphene oxide adsorbent (AA-CMC-TOA/rGO) was synthesized as a promising sorbent for Zr4+ and Y3+ ions by gamma irradiation for a mixture of acrylic acid, carboxymethyl cellulose, and trioctyl amine as an organic solvent. A complete characterization of the manufactured composite was carried out to find out its chemical and physical properties several techniques such as XRD, EDX, SEM, FT-IR, TGA-DTA, and BET. Several factors affecting the Zr4+ and Y3+ adsorption processes were studied to set the best conditions that achieve the extreme loading capacity of Zr4+ and Y3+ ions. Loading capacities of 0.99 and 1.07 mmol g−1 were achieved for Zr4+ and Y3+, respectively. The results of the kinetic models indicated that the adsorption reactions of Zr4+ and Y3+ ions were carried out via a chemical reaction mechanism. Langmuir, Dubinin–Radushkevich, and Redlich–Peterson models accurately described the adsorption isotherm data by proving their chemical nature. The results of thermodynamics added evidence of the chemical nature, spontaneous, and endothermic nature of the adsorption processes. A complete retrieval for Zr4+ and Y3+ ions contents located in the effluent was efficiently achieved using AA-CMC-TOA/rGO sorbent which proved its uses as a promising sorbent.

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Effective sorption of U(VI) from chloride solutions using zirconium silico-tungstate matrix

Cited by 12 publications

References 45 publications

Synthesis, Characterization, and Potential Evaluation of Modified Cellulose Immobilized with Hydroxyquinoline as a Sorbent for Vanadium Ions

Synthesis, Characterization, and Potential Evaluation of Modified Cellulose Immobilized with Hydroxyquinoline as a Sorbent for Vanadium Ions

Zirconium preconcentration from zircon raffinate using gamma radiation–induced polymerization of reduced graphene oxide composite

Efficacious Recovery of Zirconium and Yttrium Ions from Effluents Using a Gamma-Irradiated Reduced Graphene Oxide Polymeric Composite

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