title: Equilibrium and kinetics for the sorption of promethazine hydrochloride onto K10 montmorillonite.
abstract: This study presents the adsorption of cationic drug, promethazine hydrochloride from aqueous solution onto K10 montmorillonite. The effects of pH and temperature on adsorption process were investigated. Maximum adsorption pH was obtained to be about 7.5. Thermodynamic parameters found in this study depict the exothermic nature of adsorption. The process was favorable and spontaneous. From kinetic studies, it was found that adsorption process obeyed the pseudo-second-order kinetic model. The Langmuir, Freundlich, Dubinin-Radushkevich (DR) models were applied to describe the equilibrium isotherms and the isotherm constants were determined. The fit of the Langmuir and DR models appeared to be good. Physisorption mainly controls the whole adsorption process but chemisorption also shows a particular contribution.
authors.affiliation: Department of Chemistry, Faculty of Arts and Sciences, Dokuz Eylül University, 35160 Buca, Izmir, Turkey.
authors.forename: Gürhan
authors.initials: G
authors.lastname: Gereli
authors.forename: Yoldaş
authors.initials: Y
authors.lastname: Seki
authors.forename: I
authors.initials: I
authors.lastname: Murat Kuşoğlu
authors.forename: Kadir
authors.initials: K
authors.lastname: Yurdakoç