Document Type: Research Paper
Department of Chemistry, Faculty of Science, Islamic Azad University, Rasht Branch, I.R. Iran
Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, I.R. Iran
This work describes the optical and structure properties of nickel sulfide and cobalt sulfide nanoparticles in ZSM-5 zeolite. The samples were obtained by sulfidation of the Ni2+ and Co2+ ion-exchange ZSM-5 zeolites in a Na2S solution at room temperature. The optical properties of the samples were studied by UV-visible spectroscopy. Their crystalline structure and morphology were studied by X-ray diffraction and scanning electron microscopy. Specific surface area and infrared spectroscopy results reveal that nanoparticles could grow on the surface area of ZSM-5 zeolites. Absorption peaks at higher energy than the fundamental adsorption edge of bulk nickle sulfide and cobalt sulfide indicate quantum confinement effect in nanoparticles as a consequence of their small size. The absorption spectra show that the optical band gap varies in the range of 3.91-4.72 eV.