SYNTHESIS AND APPLICATION OF GRAPHENE OXIDE - POLYPYRROLE NANOCOMPOSITE FOR REMOVAL OF LEAD (II) AND CADMIUM (II) FROM AQUATIC MEDIA

Abstract

    A graphene oxide – polypyrrole (GO-PPy) nanocomposite was synthesized for the removal of Cd(II) and Pb(II) ions from aqueous solutions. The nanocomposite was characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The sorption on the GO-PPy nanocomposite was investigated under various conditions, that is, contact time, adsorbent dosage and initial metal ions concentration. The isothermal sorption model was carried out and the results show that the Freundlich isothermal model is more suitable than the Langmuir model for describing the adsorption process of composite materials for the of Pb(II) and Cd(II) ions. Modeling of sorption kinetics indicates that the pseudo–second–order model described the sorption better than pseudo–first– order model. It was found that the GO-PPy composites can be used as an effective adsorbent in the removal of Cd(II) ) and Pb(II) ions from water.

Keywords: Polypyrrole, graphene oxide, composite, cadmium, lead, adsorption.