期刊
CHEMICAL ENGINEERING JOURNAL
卷 145, 期 2, 页码 196-202出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2008.04.001
关键词
Adsorption; Isotherm; Activated carbons; Posidonia; Methylene blue; Phenol modelling; Surface heterogeneity
A new isotherm equation. the Brouers-Sotolongo isotherm (BSI), a deformed (Weibull) exponential equation was used to describe adsorption equilibrium of phenol and methylene blue (MB), respectively onto a non-porous adsorbent. Posidonia oceonica fibres and two porous adsorbents, chemically and physically activated carbons (ACs) prepared from vetiver roots. The adsorption characteristic parameters obtained were also calculated using classical adsorption isotherm, i.e. the Langmuir isotherm (LI), Freundlich isotherm (FI) and Redlich-Peterson isotherm (RPI). Using only R-2 to determine the best-fitting model was not sufficient, calculation of the error deviation using both the Marquardt's percent standard error (MDSE) and the average relative error (ARE) was also clone. For the case of phenol, and among all studied the BSI involving adsorption on a heterogeneous surface is definitely the most suitable one to models, satisfactorily describe biosorption of phenol on posidonia, but as well adsorption of phenol on the ACs giving the highest squared correlation coefficients and the lowest MPSE. For posidonia and as well for the when MB is the adsorbate, the RPI is the best-fitting model. (C) 2008 Elsevier B.V. All rights reserved.
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