Removal of Orange 2G Dye from Aqueous Solutions Using TiO2-Based Nanoparticles: Isotherm and Kinetic Studies

Al-Arfaj, A.A.; Alakhras, Fadi; Alabbad, Eman A.; Alzamel, N.O.; Alomair, Nuhad A.; Ouerfelli, N.

doi:10.14233/ajchem.2018.21298

Cited by 8 publications

(3 citation statements)

References 25 publications

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“…Furthermore, the results obtained by fitting the intraparticle model indicate that the sorption mechanism is influenced by more than one diffusion phenomenon, and they contribute to the formation of surface complexes. is diffusive process is physically related to the parameter τ estimated in the model (τ � 7.06 min), as has been observed with other materials [39][40][41].…”

Section: Sorption Experimentssupporting

confidence: 68%

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Prediction of Europium Retention in Perovskite: Potential Candidates for an Engineering Barrier in the Disposal of Radioactive Waste

Ortiz-Oliveros

Espinosa

Ávila-Pérez

et al. 2021

Journal of Chemistry

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Perovskites, such as tausonite, are crystalline metal oxides with excellent optical and photocatalytic properties and have also been used successfully in the retention of metals, simulating the isotopes of uranium and plutonium. In this work, different pseudo-order and thermodynamic models were studied to achieve the prediction of the sorption of Eu3+ (chemical analogous for actinides) in tausonite. The effects of gamma irradiation and temperature on the structural characteristics of the material were determined, as an additional step in the evaluation of material as an engineering barrier in the disposal of radioactive waste. The results obtained show that the tausonite is resistant to the gamma irradiation and thermal energy. Likewise, it was possible to determine that europium sorption occurs through an exothermic and spontaneous reaction, as well as through the formation of surface complexes, where Eu3+ ions bind to sites on the tausonite by dipole-dipole interaction. Furthermore, it was shown that the sorption mechanism is influenced by diffusive phenomena, which participate in the formation of surface complexes. Additionally, a new sorption model with respect to pH was proposed, which allowed determining the physical parameter π. The evidence obtained suggests that π is a physical parameter that relates pH to an optimal value and could explain the equilibrium between the surface complexes that tausonite forms with europium. Likewise, the evidence suggests that 50 kg of tausonite would have the capacity to retain at least 26.59 g of alpha-emitting radionuclides, equivalent to a waste package (900 kg) with a maximum activity of 4000 Bq/g.

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Section: Sorption Experimentssupporting

confidence: 68%

“…e results of fitting of the experimental data suggest that the europium retention process in tausonite can be explained by interpreting three zones [39], which can be seen in Figure 6(c). Zone I is attributed to the diffusional process of EuNO 2+ 3 on the surface of the material; therefore, this was the fastest sorption period.…”

Section: Sorption Experimentsmentioning

confidence: 91%

Prediction of Europium Retention in Perovskite: Potential Candidates for an Engineering Barrier in the Disposal of Radioactive Waste

Ortiz-Oliveros

Espinosa

Ávila-Pérez

et al. 2021

Journal of Chemistry

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“…The pseudo second-order kinetic model describes the kinetic behavior of adsorption process on solid surfaces for the liquid-solid system [25][26]. Ho and McKay's pseudo second order rate equation linearly expressed as following:…”

Section: Pseudo Second-order Kineticsmentioning

confidence: 99%

Kinetics and Thermodynamics of Acid Red 1 Adsorption on Used Black Tea Leaves from Aqueous Solution

Ahmed¹,

Rafia²,

Hossain³

2021

ijSciences

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This study presents the investigation of kinetics and thermodynamics of adsorption of Acid Red 1 (AR1) from aqueous solution on used black tea leaves (UBTL) as a biosorbent. The effects of initial dye concentration, solution pH and temperature on the adsorption kinetics were evaluated through batch adsorption experiments. Different kinetic model equations such as pseudo first order, pseudo second order, Elovic and Intra-particle diffusion were applied to the experimental data to evaluate their validity and determined their respective parameters. The results revealed that the adsorption kinetics is well described by pseudo second order kinetic equation. The equilibrium amounts adsorbed, calculated from the pseudo second order kinetic plots for different initial concentrations, were used to construct the adsorption isotherm which is well expressed by Langmuir equation compared with Freundlich one and the maximum adsorption capacity was 30.03 mg/g. Again, the equilibrium amounts adsorbed, calculated from the pseudo second order kinetic plots for different temperatures, were increased with the increase of adsorption temperature indicating the adsorption is endothermic. The calculated values of apparent activation energy (Ea = 3.35 kJ/mol), enthalpy change (∆H = +30.05 kJ/mol), entropy change (∆S = +0.119 kJ/mol) and free energy change (∆G) revealed that the adsorption of AR1 on UBTL at pH 2.0 was endothermic, spontaneous and physical in nature. The equilibrium amount adsorbed for different initial pH of solution, calculated from pseudo order kinetic plots, was found to be decreased with increase of solution pH from 2.0 to 8.0 suggesting the adsorption mechanism is dominated by electrostatic interaction between positive surface of UBTL at pH 2.0 and negative AR1 dye molecules.

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Biosorption of Cd(II) Ions from Aqueous Solution Using Chitosan-iso-Vanillin as a Low-Cost Sorbent: Equilibrium, Kinetics, and Thermodynamic Studies

Alakhras

2018

Arab J Sci Eng

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Removal of Orange 2G Dye from Aqueous Solutions Using TiO2-Based Nanoparticles: Isotherm and Kinetic Studies

Cited by 8 publications

References 25 publications

Prediction of Europium Retention in Perovskite: Potential Candidates for an Engineering Barrier in the Disposal of Radioactive Waste

Prediction of Europium Retention in Perovskite: Potential Candidates for an Engineering Barrier in the Disposal of Radioactive Waste

Kinetics and Thermodynamics of Acid Red 1 Adsorption on Used Black Tea Leaves from Aqueous Solution

Biosorption of Cd(II) Ions from Aqueous Solution Using Chitosan-iso-Vanillin as a Low-Cost Sorbent: Equilibrium, Kinetics, and Thermodynamic Studies

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