Modification of synthesized β-zeolite by ethylenediamine and monoethanolamine for adsorption of Pb2+

β-Zeolite was synthesized and modified with monoethanolamine (MEA) and ethylenediamine (EDA). The synthesized materials were characterized by X-ray diffraction, FT-IR, TG/DTG and SEM techniques. The adsorbents were used for removal of Pb2+ from aqueous solutions. The effect of the solution pH, contact time, metal ions concentration, and temperature was studied. The results indicated that adsorption of Pb2+ on the surface of the adsorbents depended on the solution pH and was maximized at pH = 4.0. The adsorption isotherms were evaluated with reference to Langmuir and Freundlich models. Thermodynamic studies showed that the adsorption process was endothermic and spontaneous.