Please use this identifier to cite or link to this item: https://hdl.handle.net/11499/8465
Title: Adsorptive removal of thorium (IV) using calcined and flux calcined diatomite from Turkey: Evaluation of equilibrium, kinetic and thermodynamic data
Authors: Yusan, S.
Gok, C.
Erentürk, Sema
Aytas, S.
Keywords: Adsorption
Diatomite
Isotherm
Kinetic
Thermodynamic
Thorium
Adsorption experiment
Adsorption process
Adsorptive removal
Batch process
Calcined diatomite
Contact time
Dubinin-Radushkevich
Endothermic process
Film diffusion
Flory-Huggins isotherm
Freundlich
Initial concentration
Intra-particle diffusion
Kinetic models
Langmuirs
pH range
PH-dependent
Pseudo-first-order
Pseudo-second-order kinetic models
Rate-limiting steps
Sorption capacities
Sorption isotherms
Temperature dependent
Thermodynamic data
Batch data processing
Diffusion
Dyes
Isotherms
Kinetic theory
Kinetics
Thermoanalysis
Thermodynamics
Calcination
adsorption
concentration (composition)
diatomite
endothermy
isotherm
temperature
thermodynamics
thorium
Turkey
Abstract: Adsorption experiments were performed under batch process, using Th(IV) initial concentration, pH of solution, contact time and temperature as variables. Th(IV) uptake by calcined (C-D) and flux calcined diatomite (FC-D) was pH dependent (pH range, 3.0-6.0) and maximum sorption was observed at pH 4.0. Sorption capacities for Th(IV) were found to be 0.52 (121.22. mg Th/g) and 0.50. mmol/g (116.69. mg Th/g) for calcined diatomite (C-D) and flux calcined diatomite (FC-D), respectively. Adsorption process is well described by Freundlich and Dubinin-Radushkevich (D-R) isotherms in comparison with Langmuir, Temkin and Flory-Huggins isotherms. Thermodynamic data (? H°, ? S°, ? G°) were calculated from the temperature-dependent sorption isotherms. Results suggested that the adsorption of Th(IV) on calcined and flux calcined diatomite was a spontaneous and endothermic process. A comparison of kinetic models applied to the adsorption of Th(IV) onto C-D and FC-D was evaluated for the pseudo-first-order, pseudo-second-order, intraparticle diffusion and film diffusion kinetic models. The experimental data fitted very well the pseudo-second-order kinetic model and also followed by intra-particle diffusion model, whereas intraparticle diffusion and film diffusion are both the rate limiting steps for Th(IV) onto calcined and flux calcined diatomite. © 2012 Elsevier B.V.
URI: https://hdl.handle.net/11499/8465
https://doi.org/10.1016/j.clay.2012.05.012
ISSN: 0169-1317
Appears in Collections:Fen-Edebiyat Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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