title: Adsorption of dyes onto activated carbon prepared from olive stones.
abstract: Activated carbon was produced from olive stones(OSAC) by a physical process in two steps. The adsorption character of this activated carbon was tested on three colour dyes molecules in aqueous solution: Methylene blue (MB), Rhodamine B (RB) and Congo Red(CR). The adsorption equilibrium was studied through isotherms construction at 30 degrees C, which were well described by Langmuir model. The adsorption capacity on the OSAC was estimated to be 303 mg/g, 217 mg/g and 167 mg/g respectively for MB, RB and CR. This activated carbon has a similar adsorption properties to that of commercial ones and show the same adsorption performances. The adsorption kinetics of the MB molecule in aqueous solution at different initial concentrations by OSAC was also studied. Kinetic experiments were well fitted by a simple intra-particle diffusion model. The measured kinetics constant was influenced by the initial concentration and we found the following correlation: Kid = 1.55 C0(0.51).
authors.affiliation: Chemical Reactors and Process Control, National School of Engineers of Gabes, Medenine Street 6029, Tunisia. najar@enig.mu.tn
authors.forename: Souad
authors.initials: S
authors.lastname: Najar-Souissi
authors.forename: Abdelmottaleb
authors.initials: A
authors.lastname: Ouederni
authors.forename: Abdelhamid
authors.initials: A
authors.lastname: Ratel
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D004553:Electric Conductivity; D006863:Hydrogen-Ion Concentration; D007455:Iodine; D007700:Kinetics; D008956:Models, Chemical; D031658:Olea; D010636:Phenols; D012639:Seeds / Q000737:chemistry*; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D010636:Phenols; D014874:Water Pollutants, Chemical; D002244:Carbon; D007455:Iodine