title: Sorption study of an acid dye from an aqueous solutions using modified clays.
abstract: The removal of the pollutant Supranol Yellow 4GL (S.Y.4GL) was studied by using different clays: clay exchanged with sodium (BNa+) and hydroxyaluminic polycation pillared clays in the presence or absence of non-ionic surfactant. While decomposing the surfactant at 500 degrees C, the surface of the clay changed significantly. The study of the behaviour of the three clays with respect to coloring solutions, allowed to determine the equilibrium time and the rate-determining step of the dye S.Y.4GL adsorption. Two simplified kinetic models, were tested to investigate the adsorption mechanisms in terms of pseudo-first order and pseudo-second order equations. Besides, the adsorption capacity data were fitted to Langmuir and Freundlich equations as well. A better fixation was obtained with an acidic pH. The effect of temperature on the adsorption of dye has been also studied and the thermodynamic parameters DeltaG degrees , DeltaH degrees and DeltaS degrees were determined.
authors.affiliation: Laboratoire de Physico-Chimie des Matériaux, Département de Chimie, Faculté des Sciences, USTO-MB, M'Nouar 1505, Oran 31000, Algeria.
authors.forename: Z
authors.initials: Z
authors.lastname: Bouberka
authors.forename: S
authors.initials: S
authors.lastname: Kacha
authors.forename: M
authors.initials: M
authors.lastname: Kameche
authors.forename: S
authors.initials: S
authors.lastname: Elmaleh
authors.forename: Z
authors.initials: Z
authors.lastname: Derriche
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry*; D000077215:Clay; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D012394:Rosaniline Dyes / Q000737:chemistry / Q000302:isolation & purification*; D013501:Surface-Active Agents; D013783:Textile Industry; D013816:Thermodynamics; D018508:Water Purification / Q000379:methods*
chemical_list: D000538:Aluminum Silicates; D004396:Coloring Agents; D012394:Rosaniline Dyes; D013501:Surface-Active Agents; D001546:Bentonite; D000077215:Clay