Adsorptive removal of thorium (IV) using calcined and flux calcined diatomite from Turkey: Evaluation of equilibrium, kinetic and thermodynamic data

Sabriye Yusan*, Cem Gok, Sema Erenturk, Sule Aytas

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87 Atıf (Scopus)

Özet

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 (δ H°, δ S°, δ 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.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)106-116
Sayfa sayısı11
DergiApplied Clay Science
Hacim67-68
DOI'lar
Yayın durumuYayınlandı - Eki 2012

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