Thermodynamic and kinetic investigations of uranium adsorption on amberlite IR-118H resin

Kilislioğlu, Ayben; Bilgin, Binay

doi:10.1016/s0969-8043(02)00316-0

Cited by 187 publications

(76 citation statements)

References 17 publications

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“…, energy E was calculated and the value of 5.2129 kJ indicates a physical adsorption process. According to Kilislioglu and Bilgin (2003), values of E lower than 8 kJ imply a physical adsorption and values between 8 and 16 kJ imply a chemical adsorption.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption of Copper in Expanded Vermiculite: Kinetics and Equilibrium

Nishikawa¹,

Neto²,

Vieira³

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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-The aim of this work was to evaluate copper adsorption on expanded vermiculite through kinetic and equilibrium studies. The kinetics of adsorption of copper into vermiculite was assessed by kinetic phenomenological models of pseudofirst order, pseudo-second-order and intra-particle diffusion models as well as a mass transfer model in the external film. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models were fitted to equilibrium data. The adsorption process follows kinetic External Film Mass Transfer and Intraparticle Diffusion models, and Freundlich model describes better the system in the equilibrium. It was also verified that the process is spontaneous, endothermic and favorable. D-R model indicated that the adsorption of copper on vermiculite is a physical process.

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Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption of Copper in Expanded Vermiculite: Kinetics and Equilibrium

Nishikawa¹,

Neto²,

Vieira³

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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“…(7)) is commonly used to describe monocomponent solution sorption. The D-R isotherm is more general than the Langmuir isotherm because it rejects the assumption of a homogeneous surface and constant potential adsorption (Kilislioglu and Bilgin, 2003):…”

Section: Dubinin-radushkevich Isotherm (D-r)mentioning

confidence: 99%

Characterization and use of in natura and calcined rice husks for biosorption of heavy metals ions from aqueous effluents

Vieira

Neto

Silva

et al. 2012

Braz. J. Chem. Eng.

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-Heavy metal removal by adsorption using rice husks as a bioadsorbent was evaluated as an alternative for wastewater treatment. Batch equilibrium experiments and kinetic sorption studies were performed using monocomponent solutions of Ni(II), Cd(II), Zn(II), Pb(II) and Cu(II) in surface samples of in natura (RH) and calcined rice husks (RHA). RHA showed higher potential for removing lead and copper. Experimental data for adsorption isotherms of lead and copper were adjusted by Langmuir, Freundlich and Dubinin-Radushkevick (D-R) models, being better represented by the Langmuir model. The calcination of RH increased its surface area, improving its adsorption properties. From a morphological analysis obtained by SEM and diffraction patterns (XRD), a longitudinal fibrous and amorphous structure was observed for RH. TGA results indicated a total mass loss of around 60% for RH and 24.5% for RHA.

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“…The mean adsorption energy E is often used as a good measure to estimate the nature of interaction between adsorbate and binding sites. For the values of E below 8 kJ mol -1 , the adsorption process is of physical nature, while for those between 8 and 16 kJ mol -1 , the adsorption proceeds by ion exchange [37][38][39]. Values of E larger than 16 kJ mol -1 were found for adsorbents with higher sorption capacities, i.e., ACCB, Zr/ACRS, and Zr/ACWS.…”

Section: Dubinin-radushkevitch Analysismentioning

confidence: 93%

“…Dubinin-Radushkevitch (DR) isotherm was applied to clarify the mechanism involved in the adsorption of phosphate on the activated carbons and Zr/activated carbons. This model is based on the Polanyi theory and is widely used because of its general formula which does not assume a homogeneous surface or a constant adsorption potential [37]. The DR equation is expressed as:…”

Section: Dubinin-radushkevitch Analysismentioning

confidence: 99%

Adsorption of Phosphate from Aqueous Solutions onto Zirconium Loaded Activated Carbons Derived from Lignocellulosic Residues

Shindo

Takao

Ikeuchi

et al. 2011

Int.J.Soc.Mater.Eng.Resour.

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Activated carbons from raw materials of lignocellulosic residues such as rice straws, cedar bark, and waste cardboard sludge were prepared by carbonizing the raw materials under N 2 atmosphere at 673-1273 K for 1-12 h, followed by activation under CO 2 atmosphere at 973-1173 K for 0.5-6 h. Zr-loaded activated carbons were also prepared from them by a conventional impregnation method using zirconium oxynitrate solution. The obtained carbon samples were characterized by N 2 adsorption and XRD. Development of microporosity in the activated carbons was dependent upon the precursors and the activation conditions employed. The α s -plot and pore size distribution analyses exhibited that loading of Zr species on the activated carbons in this study did not give significant influences on the microporosity of the activated carbons. A quantitative adsorption of phosphate on the Zr-loaded activated carbons was achieved below pH 9. It was found that the adsorption of phosphate on both activated carbons and Zr-loaded samples was fitted satisfactorily to Langmuir adsorption isotherms. Phosphate adsorption capacities of Zr-loaded activated carbons from rice straws and waste cardboard sludge were evaluated to be 11.1 and 5.97 mg-P g -1 , respectively, which were larger than those of relevant activated carbons used as supports. Application of Dubinin-Radushkevich analysis to the phosphate adsorption isotherms indicates that the adsorption mainly proceeds through an ion exchange mechanism.

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Thermodynamic and kinetic investigations of uranium adsorption on amberlite IR-118H resin

Cited by 187 publications

References 17 publications

Adsorption of Copper in Expanded Vermiculite: Kinetics and Equilibrium

Adsorption of Copper in Expanded Vermiculite: Kinetics and Equilibrium

Characterization and use of in natura and calcined rice husks for biosorption of heavy metals ions from aqueous effluents

Adsorption of Phosphate from Aqueous Solutions onto Zirconium Loaded Activated Carbons Derived from Lignocellulosic Residues

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