GREEN SYNTHESIS, CHARACTERIZATION AND APPLICATION OFCOPPER OXIDE NANOPARTICLES FOR REMOVAL OF ORGANIC DYES

<strong>ABSTRACT</strong>: Wastewater from textiles and other industries containing dyes pose a serious health hazard. In this study, Copper oxide nanoparticles (CuO NPs) were synthesized through green method using Moringa stenopetala leaf extract and, then evaluated for its removal efficiency of a toxic organic dyes(Congo red and Malachite green)from aqueous solution. The synthesized CuO nanoparticles were characterized using various analytical techniques. From XRD data, the average particle size of the synthesized CuO NPs was calculated by Debye-Scherrer’s equation and found to be 8.33 nm and the nanoparticle is crystalline in nature. The FT-IR spectra of the Cu-O different bending vibration bands at 1116 cm-1 and stretching vibration of Cu-O at 1649 cm-1 shows formation of CuO NPs. The morphology synthesized nanoparticles were studied by scanning electron microscope (SEM). The result shows that the grains appear plate like morphology and some of the particle with spherically random orientation. From the pH points of zero charge techniques, the point zero charge of CuO NPs adsorbent was found to be 7.00. The adsorption of dyes on the green synthesized CuO NPs was studied by optimizing different experimental parameters. The removal efficiencies of green synthesized CuO NPs adsorbent were found to be 99.54% at optimum conditions (pH = 4, initial concentration = 30 ppm, adsorbent dose = 0.25 gm and contact time = 80 min) and 98.33% at optimum conditions (pH 11, initial concentration = 20 ppm, adsorbent dose = 0.4 gm and contact time 80 min) for Congo red and Malachite green respectively. The kinetics study indicates that adsorption of Congo red and Malachite green on the surface of the CuO NPs adsorbent follows pseudo second-order kinetics and the adsorption isotherm studies indicates that equilibrium data well fitted with the Langmuir isotherm for Congo red and Malachite green dyes.