标题：Etude cinétique et thermodynamique de l’adsorption des colorants Red195 et Bleu de méthylène en milieu aqueux sur les cendres volantes et les mâchefers (Kinetic and thermodynamic study of the adsorption of Red195 and Methylene blue dyes on fly ash and bottom ash in aqueous medium),
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2014
卷号：5
期号：6
页码：1927-1939
出版社：University of Mohammed Premier Oujda
摘要：In this work, we study the elimination of two organic dyes (Methylene blue MB and Red195) by adsorption on fly ash and bottom ash from a thermal power plant (province of El Jadida). The two adsorbents were previously characterized. A series of experiments was then conducted to stud y the influence of some parameters on the adsorption capacity such as adsorben t mass, pH, contact time, initial concentration of the dyes, the effect of salts and temperature. The overall results showed th at the adsorption kinetics of the two dyes on the two materials is well described by the second order model. The adsorption isotherms of the adsorbent/adsorbate systems studied are described satisfactorily by the mathematical model of Langmuir. The pH of the solution has a little effect on discoloration. Furthermore, the thermodynamic stud y revealed that the adsorption is spontaneous and exothermic.
