Uranium adsorption characteristic and thermodynamic behavior of clinoptilolite zeolite

Kilincarslan, A.; Akyıl, S.

doi:10.1007/s10967-005-0750-5

Cited by 78 publications

(34 citation statements)

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“…Kowal-Fouchard et al [8] illuminated the surface complexation of uranyl ions and montmorillonite sorption sites. Kilincarslan and Akyil [9] studied uranium sorption on clinoptilolite zeolite surfaces and determined optimum conditions such as pH, initial concentration, contact time, and temperature. The sorption behavior of uranium on sodium aluminosilicate solid phases was investigated by Addai-Mensah et al [10] Greathouse and Cygan [11] concluded that siloxane groups of beidellite, montmorillonite, and pyrophyllite were responsible for uranyl sorption.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of amidoximated polyacrylonitrile fibers and its application for sorption of aqueous uranyl ions under continuous flow

Horzum

Shahwan

Parlak

et al. 2012

Chemical Engineering Journal

113

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Section: Introductionmentioning

confidence: 99%

Synthesis of amidoximated polyacrylonitrile fibers and its application for sorption of aqueous uranyl ions under continuous flow

Horzum

Shahwan

Parlak

et al. 2012

Chemical Engineering Journal

113

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“…In addition, modern sorption technology based on zeolite obtained qualitatively new sorbents with increased capacity and high selectivity of action. In [4][5][6][7][8][9][10][11][12] shows the prospects of their application in many catalytic and sorption processes.…”

Section: Introductionmentioning

confidence: 99%

Acid Activation of Natural Zeolite with High Content of Iron Oxides in Creation of Selective Sorbents and Catalysts

et al. 2017

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Abstract. The paper studies the influence of the nature of modifying acids (mineral, organic and heteropolyacids), and their combination on the composition and structure of the iron oxide rich clinoptilolit from Shankanay field in Kazakhstan for creation of selective catalysts in hydracarbon processing and sorbents for extracting ions of lanthanide and actinide elements. It is shown that sequential processing of natural zeolite in optimal conditions, by hydrochloric and sulfosalicylic acids lead to intensive decationization and dealumination, as well as maximum removal of iron ions from the zeolite framework without destroying it. It is found that the combination of activated clinoptilolite with hydrochloric acid and phosphotungstic heteropolyacid contributes to obtain catalyst system with high surface area and acidity.

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“…In oxidizing conditions, U will occur in the U(VI) oxidation state in the form of uranyl ions (UO 2 2+ ), which are highly mobile and more soluble in groundwater at pH less than 5.5 (Finneran et al 2002); and therefore, it is a major groundwater pollutant (Suzuki and Banfield 2004;Kilincarslan and Akylin 2005). In contrast, the U(IV) oxidation state occurs under reducing conditions as uraninite precipitate (UO 2 ) (Finneran et al 2002;Suzuki et al 2005), which renders it insoluble and immobile (Suzuki et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Optimization of a bioremediation system of soluble uranium based on the biostimulation of an indigenous bacterial community

Maleke

Williams

Castillo

et al. 2014

Environ Sci Pollut Res

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High concentrations of uranium(VI) in the Witwatersrand Basin, South Africa from mining leachate is a serious environmental concern. Treatment systems are often ineffective. Therefore, optimization of a bioremediation system that facilitates the bioreduction of U(VI) based on biostimulation of indigenous bacterial communities can be a viable alternative. Tolerance of the indigenous bacteria to high concentrations of U and the amount of citric acid required for U removal was optimized. Two bioreactor studies which showed effective U(VI) removal more than 99 % from low (0.0037 mg L(-1)) and high (10 mg L(-1)) concentrations of U to below the limit allowed by South African National Standards for drinking water (0.0015 mg L(-1)). The second bioreactor was able to successfully adapt even with increasing levels of U(VI) feed water up to 10 mg L(-1), provided that enough electron donor was available. Molecular biology analyses identified Desulfovibrio sp. and Geobacter sp. among known species, which are known to reduce U(VI). The mineralogical analysis determined that part of the uranium precipitated intracellularly, which meant that the remaining U(VI) was precipitated as U(IV) oxides and TEM-EDS also confirmed this analysis. This was predicted with the geochemical model from the chemical data, which demonstrated that the treated drainage was supersaturated with respect to uraninite > U4O9 > U3O8 > UO2(am). Therefore, the tolerance of the indigenous bacterial community could be optimized to remediate up to 10 mg L(-1), and the system can thus be upscaled and employed for remediation of U(VI) impacted sites.

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Uranium adsorption characteristic and thermodynamic behavior of clinoptilolite zeolite

Cited by 78 publications

References 1 publication

Synthesis of amidoximated polyacrylonitrile fibers and its application for sorption of aqueous uranyl ions under continuous flow

Synthesis of amidoximated polyacrylonitrile fibers and its application for sorption of aqueous uranyl ions under continuous flow

Acid Activation of Natural Zeolite with High Content of Iron Oxides in Creation of Selective Sorbents and Catalysts

Optimization of a bioremediation system of soluble uranium based on the biostimulation of an indigenous bacterial community

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