Removal of uranium(VI) and thorium(IV) ions from aqueous solutions by functionalized silica: kinetic and thermodynamic studies

Humelnicu, Doina; Blegescu, Catalin; Ganju, Dumitru

doi:10.1007/s10967-013-2873-4

Cited by 38 publications

(8 citation statements)

References 36 publications

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“…[2,10] Many techniques, such as ion exchange, reverse osmosis, coprecipitation, have been developed to remove uranium from aqueous medium. [11][12][13] Compared with the methods above, uranium adsorption is relatively efficient and low cost. [14,15] Therefore, different types of adsorbent have been prepared for recovery of uranium (VI) from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

In situ growth of ZnO nanorod arrays on cotton cloth for the removal of uranium(vi)

Zhang

et al. 2015

RSC Adv.

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In situ growth of ZnO nanorod arrays on cotton cloth (ZnO/CC) was proposed to remove uranium (VI) from aqueous solution. The as-prepared adsorbent is easy separation from the reaction medium after adsorption. The effect factors for uranium adsorption, such as solution pH, initial U (VI) concentration, contact time, and temperature have been systematically investigated. The maximum adsorption capacity of uranium (VI) which was calculated by the Langmuir model at pH=5.0 and T=298 K is 431.03 mg g -1 , exhibiting its excellent uranium adsorption properties. It was observed that the kinetic data fit well to the pseudo-second-order kinetic model indicating that the rate-limiting step of adsorption process is chemical adsorption. Moreover, thermodynamic parameters [ΔH 0 =20.26 kJ mol -1 ΔG 0 =-5.66 kJ mol -1 (298 K) ΔS 0 =86.98 J mol -1 K -1 ] reveal that the uranium adsorption is endothermic and spontaneous. Therefore, the ZnO/CC is a potential adsorbent for recovery of uranium (VI) from aqueous solution.

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Section: Introductionmentioning

confidence: 99%

In situ growth of ZnO nanorod arrays on cotton cloth for the removal of uranium(vi)

Zhang

et al. 2015

RSC Adv.

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“…Adsorption isotherm. The Langmuir and Freundlich isotherms were used to simulate the adsorption capacity of uranium by rice husk [12][13][14]  Langmuir isotherm…”

Section: Methodsmentioning

confidence: 99%

Removal Of Uranium(VI) From Aqueous Solution By Rice Husk

Xia¹,

Li²,

Xiao³

et al. 2017

Environ. Protect. Eng.

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Basic aspects of uranium adsorption by rice husk have been investigated. The influences of various experimental parameters such as pH, time, adsorbent dosage, rice husk size, temperature and various concentrations of uranium on uptake were evaluated. The thermodynamics and kinetics of adsorption were analyzed by FT-IR and SEM. The adsorption capacity for uranium on rice husk increased upon increasing initial concentration of uranium and temperature, while decreased with the increase of the amount of rice husk. Maximum uranium adsorption was observed at pH = 3 and particle size between 120 µm and 150 µm. Adsorption equilibrium was achieved within 60 min. At 25 °C, the saturated adsorption capacity qmax was up to 15.14 mg/g when the initial concentration of uranium ranged from 10 to 400 mg/dm 3 . The adsorption of uranium followed Langmuir adsorption isotherm and according to quasi-second order kinetic equation. The calculated values of ΔH°, ΔS°, and ΔG° indicated that the biosorption process was endothermic and spontaneous. Based on FT-IR spectra it may be concluded that hydroxyl, carbonyl, P-O and Si=O groups are the main active sites.

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“…The removal of heavy metals and nuclear wastes in waste waters in terms of environmental protection is an important problem [2]. These heavy metals come in sight from some industrial production such as mining, nuclear and laboratory activities [3]. Strontium is an important nuclear fission product, contained in the radioactive waste of liquid effluents [4].…”

Section: Introductionmentioning

confidence: 99%

The Removal of Sr(II) by a Nanoparticles ZnO Prepared by Microwave-Assisted Ignition Reaction

Kaynar¹,

Kaynar²

2017

Celal Bayar Üniversitesi Fen Bilimleri Dergisi

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Adsorptive behavior of nanoparticles ZnO was assessed for removal of Sr(II) in aqueous media in the different trial circumstance such as the effect of parameters (time, pH, concentration of Sr(II) and temperature) on sorption process. The capability of nanoparticles ZnO to remove Sr(II) from aqueous media was followed by a series of adsorption isotherms (Langmuir, Freunlinch and Temkin). The sorption percent and distribution coefficient for nanoparticles ZnO in ideal circumstances are % 96.5 ± 1.76; 6959 mL.g -1 for Sr(II), respectively. According to the Langmuir adsorption model, the maximum adsorption capacity of nanoparticles ZnO for Sr(II) were found to be 1396 mg.g -1 and sorption kinetics was preferable explained by the pseudo-second order equation. Thermodynamic data were identified. The results have been showed that nanoparticles ZnO was appropriate as adsorbent materiel for recovery and sorption of Sr(II) ions from aqueous media. It was found that synthesized ZnO powders had high capacity to recovery Sr(II) of the aqueous media as adsorbent.

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Removal of uranium(VI) and thorium(IV) ions from aqueous solutions by functionalized silica: kinetic and thermodynamic studies

Cited by 38 publications

References 36 publications

In situ growth of ZnO nanorod arrays on cotton cloth for the removal of uranium(vi)

In situ growth of ZnO nanorod arrays on cotton cloth for the removal of uranium(vi)

Removal Of Uranium(VI) From Aqueous Solution By Rice Husk

The Removal of Sr(II) by a Nanoparticles ZnO Prepared by Microwave-Assisted Ignition Reaction

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