Methylene Orange dye removal in aqueous solution using synthesized CdO-MnO2 nanocomposite: kinetic and thermodynamic studies

Abstract

Water pollution problems by dyes is one of the dangerous pests facing the environment, especially those dyes that cause health problems. In this study, CdO-MnO2 Nanocomposite have been successfully synthesized by simple chemical method. The crystallite size and morphology of the Nano-synthesized powders were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The SEM result revealed that, the average particle sizes was 31.56 nm with particles shape as a Zero dimension. The CdO-MnO2 Nano-synthesized behave as an attractive adsorbent for Methylene orange (M.O) dye in aqueous solution by various temperature (25, 35, 45 and 55˚C). The thermodynamic parameters (ΔS, ΔH, ΔG) and Kinetic (order of the adsorption process) were calculated. The results show that the application of nanocomposite CdOMnO2 would be promoted by high adsorption capability and selectivity for dye solutions (M.O). CdO-MnO2 can considered as a friend of the environment and Nano powder as advanced adsorbent materials.