Removal of Brilliant Blue R from Aqueous Solutions on Activated Carbon Produced from Carbonaceous Substrate / S. Alam in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 4/2009 (07-8/2009)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 4/2009 (07-8/2009) . - p. 205-214 Titre : Removal of Brilliant Blue R from Aqueous Solutions on Activated Carbon Produced from Carbonaceous Substrate Type de document : texte imprimé Auteurs : S. Alam, Auteur ; F. K. Bangash, Auteur ; M. Ahmad, Auteur Année de publication : 2009 Article en page(s) : p. 205-214 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Charbon actif Chimie de l'environnement Colorants Solutions aqueuses (chimie) Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Adsorption of brilliant blue R on activated carbon produced from the wood of Paulownia Tomentosa was investigated. Samples characterization by XRD, SEM, EDS and FTIR showed that the oxygen containing surface functional groups (carboxyls, lactones or phenols and ethers) were present on the surface which were eliminated at 800°C. Activation at 800°C, resulted in the opening of porous structure thereby increasing the adsorption capacity. Relatively high amounts of carbon with respect to oxygen were found in the samples with the rise in activation temperature. The adsorption kinetic at 10 and 45°C showed that the first order, Bangham and parabolic diffusion models are applied to the data. The rate constant increased with the rise in temperature of adsorption/activation. Thermodynamic properties ((delta)E=/, (delta)H=/, (delta)S=/ and (delta)Go) for the adsorption process were calculated. Positive values of (delta)H=/ showed that the adsorption of brilliant blue R is endothermic. Negative values of (delta)S=/ reflected the decrease in the disorder of the system at the solid-solution interface during adsorption. The Gibbs free energy, which is the driving force for adsorption is negative indicating spontaneous adsorption. Freundlich and Langmuir models described the equilibrium adsorption data and Thomas model was used for the column study. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6053 [article]

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