Batch and column studies on uranium adsorption by Amberlite XAD-4 modified with nano-manganese dioxide

Zidan, W. I.; Abo-Aly, M.M.; Elhefnawy, O. A.; Bakier, E.

doi:10.1007/s10967-014-3833-3

Cited by 17 publications

(4 citation statements)

References 45 publications

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“…Where q f is the maximum adsorption capacity of the adsorbent by the Freundlich isotherm model, K F is the Freundlich isotherm constant related to adsorption capacity (mg/g), and 1/n is the heterogeneity factor constant (Webe and Morris, 1963; Elhefnawy et al , 2014a, 2014b; Yang, 1998; Basha et al , 2008; Zidan et al , 2015) (see Appendix, Figures A3 and A4). Figure 8 shows the non-linear fitting of the experimental data with Langmuir and Freundlich models at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Effective adsorption of U(VI) from aqueous solution using polystyrene grafted with zeolite

Elhefnawy

Elabd

2022

PRT

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Purpose The purpose of this study is to prepare Polystyrene grafted with Zeolite Y (Zeosty) for Uranyl ion [U(VI)] adsorption from aqueous solution. The adsorption mechanism has been explained by studying kinetic, isothermal and thermodynamic models. Design/methodology/approach Polystyrene was grafted with Zeosty by a simple hydrothermal technique. Zeosty was characterized by different techniques such as X-ray diffraction, scanning electron microscope, energy dispersive X-ray and Infrared spectroscopy to confirm its structure and its molecular composition. Zeosty was used for U(VI) adsorption from an aqueous solution in a series of batch experiments. The effects of pH, contact time, initial U(VI) concentration and temperature on the adsorption process were investigated. Findings The results showed that the adsorption of U(VI) on the prepared reached equilibrium at pH 6 with a removal efficiency of 98.9%. Adsorption kinetics and isotherms models are studied on the experimental data to estimate the mechanism of the adsorption reaction was chemisorption and homogenous reaction. The activity of Zeosty increased at high temperatures, resulting in the adsorption capacity increase. Thermodynamic parameters ΔGo, ΔHo and ΔSo indicate that the adsorption processes are spontaneous and endothermic. Zeosty has an effective surface and could be considered a valuable adsorbent for U(VI) removal from aqueous waste. A comparison study proves that the new adsorbent has high effective behavior in the adsorption process, and it is considered a new reliable adsorbent for U(VI) removal from wastewater. Originality/value This study is complementary to the previous study using the same technique to prove that the effective fine particle adsorbents need solid support to enhance their absorption capacities.

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Section: Resultsmentioning

confidence: 99%

Effective adsorption of U(VI) from aqueous solution using polystyrene grafted with zeolite

Elhefnawy

Elabd

2022

PRT

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“…Because the number of uranyl ion in solution was fixed, the adsorption capacity per unit of the adsorbents was bound to reduce with the increasing of dosage and the adsorption capacity would decrease. Therefore, when the dosage was 0.5 g/L, the adsorption capacity could reach 492 mg/g, much larger than ones of other absorbent materials, such as what Gao et al [14] claimed and what Zidan [15] claimed. Because of larger specific surface area, granulated nZVI/AC would have huge advantage and better implication prospect.…”

Section: Effect Of Dosagementioning

confidence: 91%

Removal of uranium(VI) from aqueous solution using nanoscale zero-valent iron supported on activated charcoal

Liu

Wang

et al. 2016

J Radioanal Nucl Chem

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The nanoscale zero-valent iron supported on activated charcoal (nZVI/AC) by the reduction of ferrous sulfate heptahydrate with sodium borohydride was synthesized for uranium(VI) adsorption. The nZVI/AC was characterized using X-ray radiation diffraction and scanning electron microscope. The adsorption kinetics, adsorption isotherms and adsorption thermodynamics were also examined. The adsorption capacity reached 492.6 mg/ g when dosage was 0.5 g/L, initial concentration of uranium(VI) was 250 mg/L, pH was 5, temperature was 35°C and time was 60 min. The experimental results indicated that nZVI/AC possessed many advantages such as simple and economy for preparation, less adsorbent dosage, short balance time, high adsorption ratio and adsorption capacity. The synthesized adsorbent is promising to efficiently treat the uranium-contained wastewater.

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“…104-111 (VI) [3], à òàêaeå íà õèìè÷åñêóþ ìîäèôèêàöèþ èçâåñòíûõ ñîðáåíòîâ (ïðèðîäíûõ ìàòåðèàëîâ, èîíîîáìåííûõ ñìîë, íåîðãàíè÷åñêèõ ñîðáåíòîâ) ñ öåëüþ ïîâûøåíèÿ ñêîðîñòè ñîðáöèè è ñåëåêòèâíîñòè èõ äåéñòâèÿ, óìåíüøåíèÿ äîçû ñîðáåíòîâ, óïðîùåíèÿ èõ ðåãåíåðàöèè è ò.ä. [4][5][6]. Ïåðñïåêòèâíûìè ñîðáåíòàìè ÿâëÿþòñÿ âîëîêíèñòûå èîíèòû ÔÈÁÀÍ (ðàçðàáîòêà Èíñòèòóòà ôèçèêî-îðãàíè÷åñêîé õèìèè ÍÀÍ Áåëàðóñè).…”

Section: Recovery and Concentration Of Uranium(vi) Compounds From Nitunclassified

Recovery and concentration of uranium(VI) compounds from nitrate solutions by FIBAN fibrous ion exchangers under dynamic conditions

2019

VKhKhT

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Batch and column studies on uranium adsorption by Amberlite XAD-4 modified with nano-manganese dioxide

Cited by 17 publications

References 45 publications

Effective adsorption of U(VI) from aqueous solution using polystyrene grafted with zeolite

Effective adsorption of U(VI) from aqueous solution using polystyrene grafted with zeolite

Removal of uranium(VI) from aqueous solution using nanoscale zero-valent iron supported on activated charcoal

Recovery and concentration of uranium(VI) compounds from nitrate solutions by FIBAN fibrous ion exchangers under dynamic conditions

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