Adsorption of Lead from Wastewater Using Olive Leaf Powder as Biosorbent

M. Fodil · S. Maane · A. Avalos Ramirez · B. Delgado Cano · M. F. Haroun

The residues of olive present high potential to be valorized as biosorbent. In the present study, the properties of olive leaf powder (OLP) as biosorbent of lead ions present in wastewater were analyzed. Firstly, the OLP was characterized by determining its physio-chemical properties using analytical methods as X-ray fluorescence, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, pH of zero-point charge. The optimal operating conditions are determined following adsorption tests, using pH 7.5, contact time5 minutes, temperature 20°C, and biosorbent content of 2 g.L -1 , for a lead ions concentration of 80 mg.L -1 . The Langmuir isotherm model is fitted the best to experimental data with an adsorption capacity q e = 68.96 mg.g -1 . The adsorption is a pseudo-second order kinetics reactional system and the study of thermodynamic parameters revealed that the adsorption of lead on OLP is exothermic and spontaneous.