Removal of aniline from aqueous solution by activated kaolinite: Kinetic, equilibrium and thermodynamic studies
Küçük Resim Yok
Tarih
2019
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, the adsorption kinetics, equilibrium and thermodynamics of aniline on native (NK) and acid activated (AK) kaolinites were examined. It was shown that modification of kaolinite with acid not only increases the adsorption capacity of the adsorbent from 109.89 to 256.41 mgg(-1) for aniline but also its initial sorption rate for aniline, suggesting the activated kaolinite with higher adsorption capacity have great potential application in removal of aniline from water and wastewater. Adsorption efficiency for AK reached at about 91% while it was at about 75% for NK. The kinetics of adsorption of aniline was discussed using three kinetic models, the pseudofirst-order, the pseudo-second-order and the infra-particle diffusion model. The experimental data fitted very well the pseudo-second-order kinetic model due to the higher correlation coefficient and lower sum of squared errors (SSE,%) values, and a good agreement between the experimental and the calculated qe values. Experimental results were also analysed by the Langmuir, Freundlich and Dubinin-Redushkevich (D-R) isotherm models. R-L separation factor for Langmuir and the n value for Freundlich isotherm show that aniline are favourably adsorbed by NK and AK. The negative value of Delta G and positive value of Delta S showed that the adsorption of aniline onto NK and AK was feasible and spontaneous. The positive value of Delta H confirmed the endothermic nature of adsorption.
Açıklama
Anahtar Kelimeler
Aniline, Kaolinite, Adsorption, Kinetics, Equilibrium
Kaynak
Colloids And Surfaces A-Physicochemical And Engineering Aspects
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
569
