Decontamination of Uranium-Polluted Groundwater by Chemically-Enhanced, Sawdust-Activated Carbon

El‐Magied, Mahmoud O. Abd; Mohammaden, Tarek F.; El-Aassy, Ibrahim K.; Gad, H.M.H.; Hassan, Ali M.; Mahmoud, Mohamed

doi:10.3390/colloids1010002

Cited by 24 publications

(4 citation statements)

References 26 publications

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“…Comparison of sorption capacity of obtained sorbents and other low-cost adsorbents clearly proves the effectiveness of the applied approach. The maximum sorption capacity of modified montmorillonite and palygorskite were 83.3 and 90.2 mg/g, which correspond 350 and 379 µmol/g of sorbed 238 U respectively, and were higher than the reported low-cost uranium adsorbent based on activated carbon from sawdust and its amine form: 57.3 and 76.7 mg/g, respectively [37], and nanoscale zerovalent iron supported on Na-bentonite [38].…”

Section: Discussionmentioning

confidence: 70%

Adsorption of Uranium (VI) from Aqueous Solutions by Amino-functionalized Clay Minerals

Тобілко

Spasonova

Kovalchuk

et al. 2019

Colloids and Interfaces

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Silylation of clay minerals from Cherkasy deposit (Ukraine) montmorillonite (layer silicate) and palygorskite (fibrous silicate) was performed using organosilane (3-aminopropyl)triethoxysilane (APTES). Solvents with different polarity (ethanol, toluene) were used in synthesis. The structure of modified minerals was characterized by complex of methods (X-ray powder diffraction, Fourier transform infrared spectroscopy, nitrogen adsorption-desorption at −196 °C and thermal analysis). Studies of adsorption characteristics of APTES-modified clay minerals were carried out in relation to uranium (VI). The results indicated that modified montmorillonite and palygorskite were effective materials for water purification from UO22+.

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Section: Discussionmentioning

confidence: 70%

Adsorption of Uranium (VI) from Aqueous Solutions by Amino-functionalized Clay Minerals

Тобілко

Spasonova

Kovalchuk

et al. 2019

Colloids and Interfaces

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“…The determination of the desorption capacity and the reuse capacity of the adsorbent is an important index to evaluate its practical application value [ 53 ], and it helps to understand the bonding mode between the metal ions and the adsorbents [ 43 ]. In this experiment, HCl (1.0 mol/L), H 2 SO 4 (0.5 mol/L), and HNO 3 (1.0 mol/L) were selected, respectively, to adjust the acidity of the solution.…”

Section: Resultsmentioning

confidence: 99%

The Study of Amidoxime-Functionalized Cellulose Separate Th(IV) from Aqueous Solution

Zhi

Duan

Lei

et al. 2022

Gels

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Selective extraction of low-concentration thorium (Th(IV)) from wastewater is a very important research topic. In this paper, amidoxime cellulose was synthesized, and its composition and structure were characterized by FT-IR, SEM, XPS, and elemental analysis. The adsorption experiment results showed that the adsorption reaction was a spontaneous exothermic process. When the solid–liquid ratio was 0.12 g/L and the pH value was 3.5, the adsorption percentage of the Th(IV) in water onto amidoxime-functionalized cellulose (AO-CELL) could reach over 80%. The maximum adsorption capacity can reach to 450 mg/g. At the same time, the adsorption selectivity, desorption process and reusability of the material were also studied. The results showed that the AO-CELL had a good selectivity for Th(IV) in the system with Sr2+, Cu2+, Mg2+, Zn2+, Pb2+, Ni2+, and Co2+ as co-ions. In the nitric acid concentration of 0.06 mol/L system, the AO-CELL desorption rate of Th(IV) can reach 95%, and the adsorption rate of Th(IV) in aqueous solution of AO-CELL is still above 60% when the AO-CELL is reused four times. The above results show that the amidoxime cellulose adsorption material synthesized by our research group has good selective adsorption performance for Th(IV) of a low concentration in an aqueous solution and has a good practical application value.

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“…By increasing the uranium concentration, most of these binding sites were occupied as the adsorption process proceeded and thus the total available active sites became limited . The observed increased adsorption capacity resulted from the greater driving force that allowed for overcoming the mass transfer resistance between uranium (VI) ions and the hydrogel, and consequently, the adsorption rate was increased . With further increase of uranium (VI) concentration, the removal percentage decreased while the adsorption capacity reached a plateau, signifying the saturation of the hydrogel active sites.…”

Section: Resultsmentioning

confidence: 99%

Green Hydrogel-Biochar Composite for Enhanced Adsorption of Uranium

2021

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Uranium is the backbone of the nuclear fuel used for energy production but is still a hazardous environmental contaminant; thus, its removal and recovery are important for energy security and environmental protection. So far, the development of biocompatible, efficient, economical, and reusable adsorbents for uranium is still a challenge. In this work, a new orange peel biochar-based hydrogel composite was prepared by graft polymerization using guar gum and acrylamide. The composite’s structural, morphological, and thermal characteristics were investigated via Fourier transform infrared (FTIR), scanning electron microscope (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) methods. The composite’s water absorption properties were investigated in different media. The performance of the prepared composite in adsorbing uranium (VI) ions from aqueous media was systematically investigated under varying conditions including solution’s acidity and temperature, composite dose, contact time, and starting amount of uranium. The adsorption efficiency increased with solution pH from 2 to 5.5 and composite dose from 15 to 50 mg. The adsorption kinetics, isotherms, and thermodynamics parameters were analyzed to get insights into the process’s feasibility and viability. The equilibrium data were better described through a pseudo-second-order mechanism and a Langmuir isotherm model, indicating a homogeneous composite surface with the maximum uranium (VI) adsorption capacity of 263.2 mg/g. The calculated thermodynamic parameters suggested that a spontaneous and endothermic process prevailed. Interference studies showed high selectivity toward uranium (VI) against other competing cations. Desorption and recyclability studies indicated the good recycling performance of the prepared composite. The adsorption mechanism was discussed in view of the kinetics and thermodynamics data. Based on the results, the prepared hydrogel composite can be applied as a promising, cost-effective, eco-friendly, and efficient material for uranium (VI) decontamination.

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Decontamination of Uranium-Polluted Groundwater by Chemically-Enhanced, Sawdust-Activated Carbon

Cited by 24 publications

References 26 publications

Adsorption of Uranium (VI) from Aqueous Solutions by Amino-functionalized Clay Minerals

Adsorption of Uranium (VI) from Aqueous Solutions by Amino-functionalized Clay Minerals

The Study of Amidoxime-Functionalized Cellulose Separate Th(IV) from Aqueous Solution

Green Hydrogel-Biochar Composite for Enhanced Adsorption of Uranium

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