title: Removal of lead from aqueous solutions with a treated spent bleaching earth.
abstract: A spent bleaching earth from an edible oil refinery has been treated by impregnation with a normal sodium hydroxide solution followed by mild thermal treatment (100 degrees C). The obtained material (TSBE) was washed, dried and characterized by X-ray diffraction, FTIR, SEM, BET and thermal analysis. The clay structure was not apparently affected by the treatment and the impregnated organic matter was quantitatively removed. We have investigated the sorption of lead on this material, the spent bleaching earth (SBE) and the virgin bleaching earth (VBE). The kinetic results fit the pseudo second-order kinetic model and the Weber & Morris, intraparticle diffusion model. The pH had effect on the sorption efficiency. The sorption isotherms followed the Langmuir model for various sorbent concentrations with good values of determination coefficient. A comparison between the results obtained with this material and those of the literature highlighted a good removal capacity of the treated spent bleaching earth at low cost.
authors.affiliation: Laboratoire de Valorisation des Matériaux, University of Mostaganem, B.P. 227, Mostaganem R.P., Algeria.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Mana
authors.forename: Mohand Said
authors.initials: MS
authors.lastname: Ouali
authors.forename: Marc
authors.initials: M
authors.lastname: Lindheimer
authors.forename: Louis Charles de
authors.initials: LC
authors.lastname: Menorval
mesh_terms: D000042:Absorption; D002152:Calorimetry, Differential Scanning; D004042:Dietary Fats, Unsaturated; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007220:Industrial Waste / Q000032:analysis*; D007700:Kinetics; D007854:Lead / Q000737:chemistry / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D015233:Models, Statistical; D012996:Solutions; D013055:Spectrophotometry, Infrared; D013816:Thermodynamics; D014961:X-Ray Diffraction
chemical_list: D004042:Dietary Fats, Unsaturated; D007202:Indicators and Reagents; D007220:Industrial Waste; D012996:Solutions; D007854:Lead