Preparation and evaluation of cerium(IV) tungstate powder as inorganic exchanger in sorption of cobalt and europium ions from aqueous solutions

El-Kamash, A.M.; El-Gammal, B.; El-Sayed, Abeer A.M.

doi:10.1016/j.jhazmat.2006.07.041

Cited by 45 publications

(11 citation statements)

References 35 publications

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“…The homogenous particle diffusion model (HPDM) (El-Kamash et al, 2007) allows the identification of the actual slowest step during the sorption process: (a) film diffusion, during which the ions diffuse through the liquid film surrounding the particle or (b) particle (pore) diffusion that involves the diffusion of ions into the resin beads. These two rate determining steps are represented by Eqs.…”

Section: Homogeneous Particle Diffusion Modelmentioning

confidence: 99%

A preliminary batch study of sorption kinetics of Cr(VI) ions from aqueous solutions by a magnetic ion exchange (MIEX®) resin and determination of film/pore diffusivity

et al. 2016

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A magnetic ion exchange resin was tested for the removal of Cr(VI) ions from aqueous solutions in a batch reactor at different resin dosages (0.5-1.5 g L -1 ), pH values (2-10), temperatures (25 o C-55 o C) and initial concentrations of Cr(VI) (0.11 -2.12 mmol L -1 or 5.7-110 mg L -1 ). The experimental data were evaluated using kinetic models based on the rate controlling steps relevant to pseudo-first order or pseudo-second order reactions or diffusion through fluid film or pores of the MIEX resin beads. Fast uptake of Cr(VI) ions by MIEX resin facilitates the attainment of equilibrium within 60 minutes. The sorption process is strongly dependent on the initial pH of the solution with maximum occurring at pH 4-6. The sorption of Cr(VI) at equilibrium increases with the increase in initial concentration according to the Langmuir isotherm, with a maximum sorption capacity of 93 mg g -1 on MIEX resin.Relatively low activation energy of 43 kJ mol -1 at a high initial concentration of 1 mmol L -1 Cr(VI) suggests a mixed chemical-diffusion controlled process, supported by the agreement of the sorption results with the homogeneous particle diffusion model with a film diffusivity of D f = 1 × 10 -9 m 2 s -1 and a pore diffusivity of D p = 8 × 10 -13 m 2 s -1 .

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Section: Homogeneous Particle Diffusion Modelmentioning

confidence: 99%

A preliminary batch study of sorption kinetics of Cr(VI) ions from aqueous solutions by a magnetic ion exchange (MIEX®) resin and determination of film/pore diffusivity

et al. 2016

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“…Also, the study of adsorption kinetics in wastewater treatment is important in providing valuable insights into the reaction pathways and into the mechanism of adsorption reaction. Indeed, lanthanum and europium adsorption on several materials is now well understood [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. However, as far as we know studies about their adsorption on hydroxyapatite have not been done.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Behaviour of La(III) and Eu(III) Ions from Aqueous Solutions by Hydroxyapatite: Kinetic, Isotherm, and Thermodynamic Studies

Granados-Correa

Vilchis-Granados

Jiménez‐Reyes

et al. 2012

Journal of Chemistry

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The hydroxyapatite was successfully synthesized, characterized, and used as an alternative low-cost adsorbent material to study the adsorption behavior of La(III) and Eu(III) ions from nitrate aqueous solutions as a function of contact time, initial metal ion concentration, pH, and temperature by using a bath technique. The kinetic data correspond very well to the pseudo-second-order equation, and in both cases the uptake was affected by intraparticle diffusion. Isotherm adsorption data were well fitted by the Freundlich model equation with1/n>1, indicating a multilayer and cooperative-type adsorption. Thermodynamic parameters for the adsorption systems were determinated at 293, 303, 313, and 323 K. These parameters show that adsorptions of La(III) and Eu(III) ions on hydroxyapatite are endothermic and spontaneous processes. The adsorption was found to follow the order Eu(III) > La(III) and is dependent on ion concentration, pH, and temperature.

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“…The results of the kinetic studies was analyzed using a pseudo second order rate equation [29][30][31][32]. This equation may be expressed as;…”

Section: Kinetic Resultsmentioning

confidence: 99%

The sorption behavior of Cs + ion on clay minerals and zeolite in radioactive waste management: sorption kinetics and thermodynamics

Yıldız

Erten

Kış

2011

J Radioanal Nucl Chem

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In this work, Cs? ion sorption on some clays and zeolite were investigated. 137 Cs was used as a tracer. Activities were measured with a NaI crystal gamma counter. The particle size distribution was determined by a laser sizer. Surface area of the particles were determined by BET (Brunauer, Emmett and Teller method). Structure analysis was made by using X-ray diffraction. The chemical compositions of the solid samples were determined using a ICAP-OE spectrometer. Kinetic and thermodynamic parameters were determined. Due to very high uptake results; clay and zeolite can be proposed as a good sorbents in waste management considerations.

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Preparation and evaluation of cerium(IV) tungstate powder as inorganic exchanger in sorption of cobalt and europium ions from aqueous solutions

Cited by 45 publications

References 35 publications

A preliminary batch study of sorption kinetics of Cr(VI) ions from aqueous solutions by a magnetic ion exchange (MIEX®) resin and determination of film/pore diffusivity

A preliminary batch study of sorption kinetics of Cr(VI) ions from aqueous solutions by a magnetic ion exchange (MIEX®) resin and determination of film/pore diffusivity

Adsorption Behaviour of La(III) and Eu(III) Ions from Aqueous Solutions by Hydroxyapatite: Kinetic, Isotherm, and Thermodynamic Studies

The sorption behavior of Cs + ion on clay minerals and zeolite in radioactive waste management: sorption kinetics and thermodynamics

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