Adsorption study of lead ions onto sulfur/reduced graphene oxide composite

In this study, reduced graphene oxide modified by sulfur (S/RGO) is synthesized through the green method. S/RGO is used as a catalyst for the elimination of lead ions (Pb2+) through the adsorption. The effects of different parameters on adsorption of lead ions through S/RGO are studied. Those parameters include the amount of adsorbent, pH of the solution, time of adsorption, and initial concentration of Pb+2. The scanning electron microscope (SEM), X-ray Photoelectron Spectroscopy (XPS), and Infrared spectroscopy (IR) are used for the characterization of as-prepared S/RGO samples. The mechanism of removal of lead ions by the new catalyst is also investigated. To study the kinetic aspects of the adsorption of Pb2+ by S/RGO, three different models are used including, pseudo-first-order, pseudo-second-order, and intraparticle diffusion. Both Langmuir and Freundlich isotherms were investigated in our work.