Correlation Between Structural and Optical Properties of CuO Nanoparticule Prepared by Sol–Gel Method: Degradation of Mythylene Blue

Highly feature Copper Oxide CuO nanoparticles were prepared by sol–gel method at different temperature (400, 500 °C). The Copper chloride dehydrate, ethanol and citric acid were used as precursor, solvent and stabilizer, respectively. The influence of annealing temperature on the structural and optical properties of CuO nanoparticle was also investigated. In order to determine the information on our samples several characterizations were carried out structural characterization: X-ray diffraction (XRD); Optical properties: optical absorption and photodegradation of blue methylene of nanopowder. X-ray diffraction shows monoclinic structure with high crystallinity of all powder with preferential orientation and crystallite size is 22 nm. The intensity of peaks greatly increased with increasing of annealing temperature. An extreme absorption onset has been observed for all powder in the region between 380 and 650 nm. This attributed to the absorption of light by copper oxide (CuO) nanoparticle. The band gap was determined to be 1.47–1.39 eV (decreased with annealing temperature) that is significantly smaller than the band gap of bulk copper. These CuO nanoparticule show an excellent degradation of MB reach to 95% by advanced oxidation using H2O2 which enhanced the photocatalysis applications.