Equilibrium and kinetic studies for the sorption of 3-methoxybenzaldehyde on activated kaolinites
Küçük Resim Yok
Tarih
2007
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The sorption of 3-methoxybenzaldehyde on activated kaolinites has been investigated at different temperatures. Two types of activation tests were performed. The sorption equilibrium was studied by sorption isotherms in the temperature range 303–333K for natural (untreated), thermally and acid activated kaolinites. It was shown that the isotherm shapes were not affected by temperature and activation types of kaolinite. The absorbance data at 312 nm were fitted reasonably well with the Langmuir and Freundlich isotherm models and the model parameters were determined for different temperatures. Thermodynamic quantities such as Gibbs free energy ( G), the enthalpy ( H) and the entropy change of sorption ( S) were determined for natural, thermally and acid activated kaolinites. It was shown that the sorption processes were an endothermic reactions, controlled by physical mechanisms and spontaneously. Adsorption capacity of acid activated kaolinite for 3-methoxybenzaldehyde was higher compared to that of natural and thermally activated kaolinites at various temperatures. The adsorption and desorption rate constants (ka and kd) were obtained separately by applying a geometric approach to the first order Langmuir model. This method provided good conformity between the K from Langmuir parameters and Kgeo (ka/kd) from geometric approach.
Açıklama
Anahtar Kelimeler
3-Methoxybenzaldehyde, Kaolinite, Activation, Sorption kinetics, Equilibrium
Kaynak
Journal of Hazardous Materials
WoS Q Değeri
Scopus Q Değeri
Q1
Cilt
141
Sayı
1
Künye
Koyuncu, H., Kul, A. R., Yıldız, N., Çalımlı, A. ve Ceylan, H. (2007). Equilibrium and kinetic studies for the sorption of 3-methoxybenzaldehyde on activated kaolinites. Journal of Hazardous Materials. 141(1), s. 128-139.
