Adsorption of Uranium from Sulfate Medium Using a Synthetic Polymer; Kinetic Characteristics

El-Sheikh, A. S.; Haggag, E. A.; El‐Rahman, Nasser R. Abd

doi:10.1134/s1066362220040074

Cited by 8 publications

(4 citation statements)

References 45 publications

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“…A graph was plotted for contact time (minutes) vs log Kd values as shown in 5. A similar behaviour was reported by El-Sheikh et al [17].…”

Section: Effect Of Contact Timesupporting

confidence: 90%

Study on Natural Diatomite as an Adsorbent for Uranyl (VI) ions, Using Spectrophotometric Method

Issa,

Hana B. AlHanash,

Mona M. Abdulsalam

et al. 2024

JOPAS

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This work is based on the investigation of uranyl (VI) ion adsorption onto natural diatomite using batch sorption method under different parameters such as pH, initial ion concentration, adsorbent amount and effect of sulfate ion as a foreign ion. 8-hydroxyquinoline is used as a chromogen forming a pale-yellow complex with ions in chloroform, the absorbance was measured spectrophotometrically at λmax 460 nm, obtaining a linear calibration curve with R2=0.998, LOD=3.03 mg/L and LOQ=9.21 mg/L. Prior to the implementation of the batch experiment, the morphology and composition of diatomite was confirmed using XRF (Bruker S8 Tiger), XRD (Bruker D5005), FTIR (Bruker Vector 22), and SEM (JEOL JSM-5610 LV) techniques. From spectrophotometric analysis, the results showed that the maximum uranyl ion adsorption distribution coefficient reached at the initial concentration of 50ppm, pH 4.5, contact time 5hrs and adsorption dosage of 2 g/L. There was no significant effect of sulfate ion on the adsorption affinity. Adsorption isotherm was studied by Langmuir which was favourable model fitting with R2=0.996 and maximum adsorption capacity of 16mg/g, and separation factor RL = 0.0122. Freundlich isotherm model also applied for the same data and give a very straight line with R2= 1.00 and maximum adsorption capacity of 200 mg/g. Temkin model was less fit and gave a negative isotherm curve with R2= 0.78, KT= 0.9405 L/g, bT= 24.724 J/mol. Langmuir and Freundlich isotherms gave exothermic adsorption while Temkin gave an endothermic one.

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“…A graph was plotted for contact time (minutes) vs log Kd values as shown in 5. A similar behaviour was reported by El-Sheikh et al [17].…”

Section: Effect Of Contact Timesupporting

confidence: 90%

Study on Natural Diatomite as an Adsorbent for Uranyl (VI) ions, Using Spectrophotometric Method

Issa,

Hana B. AlHanash,

Mona M. Abdulsalam

et al. 2024

JOPAS

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“…Furthermore, the uranium‐loaded adsorbent was analyzed by FTIR and the results were compared (Figure 8B), the uranium‐loaded spectra showed shifts at various peaks or increase peak intensity. What is more, in the FTIR spectrum of AO‐Fc, two new peaks were observed at 937 and 1161 cm −1 confirming the presence of uranium on AO‐Fc 56,57 …”

Section: Resultsmentioning

confidence: 74%

A novel preparation and vapor phase modification of 2D‐open channel bioadsorbent for uranium separation

et al. 2022

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An economical and highly uranium extraction from seawater remains a crucial task for energy sources and environmental safety. Aiming for improving the mass transfer rate of uranium from seawater, a new synthetic strategy was adopted to synthesize two-dimensional-open channel microporous bioadsorbent for uranium extraction from seawater. Herein, a vapor phase modification approach was adopted to graft divinylbenzene (DVB), and polyacrylonitrile (AN) onto the surfaces of microporous frameworks via a free radical polymerization method. The postsynthetic functionalization was carried out by hydrothermal process, where amidoxime groups are structure-directing agents to trap uranium. Furthermore, amidoxime groups not only enhanced hydrophilicity but also adjusts adsorbents pK a . AO-Fc faces minimum interference of competing ions and achieves a high uranium adsorption capacity of 8.57 ± 0.02 and 409 ± 1 mg/g in seawater and simulated solution. Despite its stable structure, AO-Fc exhibits a long life span and negligible weight loss revealed AO-Fc could be applied as a potential adsorbent for radionuclides.

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“…The elution experiments were conducted by shaking 0.1 g of the loaded adsorbent with 10 mL of different eluates each separately for 60 min at 250 rpm. After filtration, the eluting solution was analyzed against uranium (El-Sheikh et al 2020 ).…”

Section: Methodsmentioning

confidence: 99%

Biosorption of Uranium from aqueous solution by green microalga Chlorella sorokiniana

Embaby

Haggag

El-Sheikh

et al. 2022

Environ Sci Pollut Res

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Uranium and its compounds are radioactive and toxic, as well as highly polluting and damaging the environment. Novel uranium adsorbents with high biosorption capacity that are both eco-friendly and cost-effective are continuously being researched. The non-living biomass of the fresh water green microalga Chlorella sorokiniana was used to study the biosorption of uranium from aqueous solution. The biosorption of uranium from aqueous solutions onto the biomass of microalga C. sorokiniana was investigated in batch studies. The results showed that the optimal pH for uranium biosorption onto C. sorokiniana was 2.5. Uranium biosorption occurred quickly, with an equilibrium time of 90 min. The kinetics followed a pseudo-second-order rate equation, and the biosorption process fit the Langmuir isotherm model well, with a maximum monolayer adsorption capacity of 188.7 mg/g. The linear plot of the DKR model revealed that the mean free energy E = 14.8 kJ/mol, confirming chemisorption adsorption with ion exchange mode. The morphology of the algal biomass was investigated using a scanning electron microscope and energy dispersive X-ray spectroscopy. The FTIR spectroscopy analysis demonstrated that functional groups (carboxyl, amino, and hydroxyl) on the algal surface could contribute to the uranium biosorption process, which involves ion exchange and uranium absorption, and coordination mechanisms. Thermodynamic simulations indicated that the uranium biosorption process was exothermic (ΔH = −19.5562 kJ/mol) and spontaneous at lower temperatures. The current study revealed that C. sorokiniana non-living biomass could be an efficient, rapid, low-cost, and convenient method of removing uranium from aqueous solution.

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Adsorption of Uranium from Sulfate Medium Using a Synthetic Polymer; Kinetic Characteristics

Cited by 8 publications

References 45 publications

Study on Natural Diatomite as an Adsorbent for Uranyl (VI) ions, Using Spectrophotometric Method

Study on Natural Diatomite as an Adsorbent for Uranyl (VI) ions, Using Spectrophotometric Method

A novel preparation and vapor phase modification of 2D‐open channel bioadsorbent for uranium separation

Biosorption of Uranium from aqueous solution by green microalga Chlorella sorokiniana

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