Modification of Natural Clinoptilolite Zeolite with Iron Oxide Magnetic Nanoparticles and Sodium Sulfide Salt for Removal of Heavy Metal Cations such as Lead, Cadmium, and Manganese

In this study, the efficiency of natural clinoptilolite zeolite modified with iron oxide magnetic nanoparticles and sodium sulfide salt in the removal of three heavy metals including lead (Pb), cadmium (Cd), and manganese (Mn) was investigated. All of the measurements were carried out by atomic absorption spectrometry. The modified zeolite was characterized by FTIR, SEM, and XRD techniques. The effects of various parameters on adsorption process such as initial concentration of metal ion, contact time, adsorbent dosage, and pH have been studied. According to the obtained results, the removal efficiencies in the optimized conditions for Pb, Cd, and Mn were 98%, 92%, and 75%, respectively. The adsorption studies confirmed the potential recyclability of the modified zeolite. The results of the current study have indicated that the modified clinoptilolite zeolite can be used as an efficient and inexpensive absorbent for the removal of heavy metals in aquatic environments.