Adsorption of uranium (VI) from aqueous solution on calcined and acid-activated kaolin

Wang, Guanghui; Wang, Xuegang; Chai, Xinjun; Liu, Jinsheng; Deng, Nansheng

doi:10.1016/j.clay.2009.11.003

Cited by 136 publications

(39 citation statements)

References 29 publications

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“…The kinetic parameter, which is helpful for the prediction of the adsorption rate, gives important information for designing and modeling the processes. The mechanism of U(VI) adsorption upon Amberlite IRC747 resin and the rate constants of the sorption process were determined by using both the pseudo-first order and the pseudo-second order kinetic models [45,46]. The pseudo-first order kinetic model is represented by the following equation: …”

Section: Sorption Kineticsmentioning

confidence: 99%

Characteristics of uranium recovery from phosphoric acid by an aminophosphonic resin and application to wet process phosphoric acid

Cheira

2015

Eur. J. Chem.

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The chelating aminomethylphosphonic resin Amberlite IRC747 is used for uranium recovery from a synthetic phosphoric acid solution. The operating conditions of uranium extraction have been experimentally optimized by the batch technique viz., the phosphoric acid concentration, the contact time, the initial uranium concentration and the temperature. The effect of some interfering ions upon the effective capacity of the resin has also been examined. It has thus been found that the maximum uranium adsorption capacity of the studied chelating resin was found to attain 86.5 mg/g at 5 M phosphoric acid using 0.1 g resin for 120 min contact time with 50 mL acid assaying 200 mg U/L and room temperature. The obtained equilibrium data agreed well with the Langmuir isotherm model and the relevant thermodynamic parameters (ΔG, ΔH and ΔS) were evaluated and the uranium adsorption was found to be an endothermic reaction and of spontaneous nature. From the kinetic experiments it was shown that U(VI) adsorption followed the pseudo-second order kinetics model and the intraparticle diffusion model. Also, it has been possible to reveal from the kinetic and isotherm data the chemisorption nature of uranium on the Amberlite IRC747 resin. The adsorbed uranium ions can almost be completely eluted with 0.8 M (NH4)2CO3 solution from the loaded resin at room temperature. The studied optimized conditions have successfully been applied for uranium recovery from Abu Zaabal wet process phosphoric acid (WPPA).

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Section: Sorption Kineticsmentioning

confidence: 99%

Characteristics of uranium recovery from phosphoric acid by an aminophosphonic resin and application to wet process phosphoric acid

Cheira

2015

Eur. J. Chem.

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“…The sorption of Pb(II) on both modified kaolinite was studied in the initial pH range of 4.00, 5.00, 6.00, at different temperatures of 25, 35, 45 °C for 0.2000 g ± 0.1 mg adsorbent dose and 20.0 mL of different initial concentrations of 10,20,30,40,50,60,80 and 100 ppm at a constant ionic strength of 0.01M NaClO 4 . Every measurement was repeated three times to make sure of the accuracy and reproducibility of the results, and then the average was taken.…”

Section: Sorption Isotherms Experimentsmentioning

confidence: 99%

“…The pseudo-second-order reaction assumes that the rate limiting step may be chemical sorption [30]. Sorption data was evaluated according to the pseudo-second-order reaction kinetic proposed by Ho and McKay [31]:…”

Section: Pseudo-second-order Reaction Kineticmentioning

confidence: 99%

Sorption of Pb(II) Ions by Kaolinite Modified with Humic Acids

Al-Essa¹,

Khalili²

2016

JESE

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Sorption of Pb(II) onto modified Jordanian kaolinite clay by Fluka Humic Acid (FHA) or humic acid extracted from King Talal Dam sediments (KTD) was studied using batch technique at different time, concentration, temperatures and pH. The kinetic studies showed that the uptake increases with time and reached the equilibrium in less than 2 hours and fitted pseudo second-order model for the two modified humic acid kaolinite clay. The Pb(II) uptake properties on both modified kaolinite clay fit Langmuir, Freundlich and Dubinin-Radushkevich sorption models. The energy of sorption process calculated from Dubinin-Radushkevich showed that the sorption was a physical one. The values of ΔG o indicated that the sorption process was favorable, while ΔH o values indicated an endothermic process. On the other hand, the process has positive ΔS o which drives the sorption process. Kaolinite clay modified by (FHA) showed higher uptake for Pb(II) than that modified by KTD.

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“…Langmuir Freundlich Activated carbon 4.2 9 10 -4 3.0 28.30 [47] Zirconyl-molybdopyrophosphate-tributyl phosphate 1.26 9 10 -3 6.0 196.08 [11] AmidoximatedPolyacrylonitrile-Encapsulated Macroporous Beads 4.2 9 10 -4 6.0 1.98 [34] phosphine oxide functionalized mesoporoussilicas RLW 6.0 105 [28] Porous MOFs 5.2 9 10 -4 2.5 217 [26] Chitosan/PVA hydrogel 5.05 9 10 -4 5.0 156 [48] AO/amine fibers 4.2 9 10 -6 6.0 1.79 [5] Layered Metal Sulfides 1.68 9 10 -3 3.5 382 [20] poly(acrylic acid)-functionalized microspheres 2.5 9 10 -3 4.5 990 [32] Natural clinoptilolite-rich zeolite 4.2 9 10 -7 2.0 2.67 [49] Calcined and acid-activated kaolin 3.36 9 10 -4 5.0 4.52 [50] Lewatit TP260 3.0 9 10 -3 4.1 63.37 [51] Tulsion CH-96 2. finally the nanoparticles were used to adsorb uranium(VI) again. This process was repeated five times.…”

Section: Nanoparticlesmentioning

confidence: 99%

Synthesis of polyamidoxime-functionalized nanoparticles for uranium(VI) removal from neutral aqueous solutions

Huang

Zhang²,

Hua

2015

J Radioanal Nucl Chem

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It is important to separate uranium(VI) from water environment due to its high toxicity and radioactivity. A new kind of polystyrene nanoparticles with polyamidoxime is reported here for removal of uranium(VI) from aqueous solutions. The obtained PSt nanoparticles have a tunable sorption capacity. The sorption process follows pseudo-second-order kinetics, and the equilibrium can be reached within 6 h. Furthermore, the optimal pH value of sorption process is 6.5, and the adsorbents can be recycled well for uranium(VI) sorption from aqueous solution. This work indicates that the polyamidoxime-functionalized PSt nanoparticles may be used as a good adsorbent for the removal of uranium(VI) from neutral aqueous solution.

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Adsorption of uranium (VI) from aqueous solution on calcined and acid-activated kaolin

Cited by 136 publications

References 29 publications

Characteristics of uranium recovery from phosphoric acid by an aminophosphonic resin and application to wet process phosphoric acid

Characteristics of uranium recovery from phosphoric acid by an aminophosphonic resin and application to wet process phosphoric acid

Sorption of Pb(II) Ions by Kaolinite Modified with Humic Acids

Synthesis of polyamidoxime-functionalized nanoparticles for uranium(VI) removal from neutral aqueous solutions

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