Removal of uranium(VI) from aqueous solutions by manganese oxide coated zeolite: discussion of adsorption isotherms and pH effect

Han, Runping; Zou, Weihua; Wang, Yi; Zhu, Lu

doi:10.1016/j.jenvrad.2006.12.003

Cited by 286 publications

(88 citation statements)

References 30 publications

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“…The uranium species found in the solution depends on the pH as well as the composition of the solution [24]. The plotted results in figure (6) assure that the solution pH is a controlling factor in the uranium adsorption onto the surface of PA-MPc.…”

Section: Effect Of Phmentioning

confidence: 72%

Preparation of Poly-Aniline-Magnetic Porous Carbon Composite for Using as Uranium Adsorbent

Gado¹

2017

AJMSP

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Abstract:Rice husk as one of the agricultural by-products has been used as a starting material for the production of porous carbon (PC), the obtained porous carbon has been modified by poly aniline and magnetized to form poly aniline magnetic porous carbon composite (PA-MPC). The prepared PA-MPC has been characterized and examined for uranium adsorption from its pregnant solutions. The effect of the controlling parameters (pH; Contact time, temperature, initial uranium concentration, and adsorbent dosage) have been optimized. The obtained results indicate that the adsorption is pH dependant. The equilibrium data were well described by langmuir isotherm with theoretical capacity 94.3 mg/l at room temperature. These results demonstrate the potential use of this adsorbent for uranium ions removal from its pregnant solutions.

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Section: Effect Of Phmentioning

confidence: 72%

Preparation of Poly-Aniline-Magnetic Porous Carbon Composite for Using as Uranium Adsorbent

Gado¹

2017

AJMSP

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“…Under usual oxidizing conditions, uranium typically exists in aqueous U(VI) forms, predominantly as the free uranyl ion (UO2 2+ ) in acidic conditions (pH<5), and hydroxyl complexes such as UO2(OH) + , UO2(OH)2 and UO2(OH)3 -in slightly acidic environments (pH 5.0-6.5) and in the absence of complexing ligands such as dissolved carbonate, sulfate, and phosphate ( Langmuir, 1997;Haas et al, 1998). Under low pH conditions, aqueous U(VI) can strongly adsorb to manganese oxides and ferric oxides (Waite et al, 1994b;Han et al, 2007).…”

Section: Uranium Species and Mobilitymentioning

confidence: 99%

Uranium Bioreduction and Biomineralization

Wufuer

Wei

Lin

et al. 2017

Advances in Applied Microbiology

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“…This approach was preferred over desorbing the in fresh 0.01 M Ca(NO3)2 solutions as any change in pH or anionic ligand (e.g. phosphate, bicarbonate) concentration could increase, or decrease, U solubility for reasons other than a simple change in U VI solution concentration [28][29][30].…”

Section: Desorption Experimentsmentioning

confidence: 99%

Kinetic study of time-dependent fixation of UVI on biochar

Ashry

Bailey

Chenery

et al. 2016

Journal of Hazardous Materials

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Biochar, a by-product from the production of biofuel and syngas by gasification, was tested as a material for adsorption and fixation of U VI from aqueous solutions. A batch experiment was conducted to study the factors that influence the adsorption and timedependent fixation on biochar at 20 o C, including pH, initial concentration of U VI and contact time. Uranium (U VI ) adsorption was highly dependent on pH but adsorption on biochar was high over a wide range of pH values, from 4.5 to 9.0, and adsorption strength was time-dependent over several days. The experimental data for pH > 7 were most effectively modelled using a Freundlich adsorption isotherm coupled to a reversible first order kinetic equation to describe the time-dependent fixation of U VI within the biochar structure. Desorption experiments showed that U VI was only sparingly desorbable from the biochar with time and isotopic dilution with 233 U VI confirmed the low, or time-dependent, lability of adsorbed 238 U VI . Below pH 7 the adsorption isotherm trend suggested precipitation, rather than true adsorption, may occur. However, across all pH values (4.5-9) measured saturation indices suggested precipitation was possible: autunite below pH 6.5 and either swartzite, liebigite or bayleyite above pH 6.5.

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Removal of uranium(VI) from aqueous solutions by manganese oxide coated zeolite: discussion of adsorption isotherms and pH effect

Cited by 286 publications

References 30 publications

Preparation of Poly-Aniline-Magnetic Porous Carbon Composite for Using as Uranium Adsorbent

Preparation of Poly-Aniline-Magnetic Porous Carbon Composite for Using as Uranium Adsorbent

Uranium Bioreduction and Biomineralization

Kinetic study of time-dependent fixation of UVI on biochar

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