KINETIC STUDY OF THE PHOTOCATALYTIC DEGRADATION OF ATRAZINE OVER COPPER OXIDE NANOPARTICLES

In this study, the kinetics of degradation of atrazine (ATZ) in the presence copper oxide nanoparticles (CuO NPs) under ultraviolet light irradiation was investigated. The CuO NPs was characterized and the different operating parameters of photodegradation such as the initial concentration of ATZ, irradiation time, amount of catalyst and pH were investigated. The scanning electron microscopy (SEM) showed that the CuO NPs were spherical in nature, the particles tend to cluster, forming a random aggregate. TGA-DTA revealed weight loss regions that provide valuable insights to the thermal behaviour and properties of the CuO NPs, FTIR peaks were ascribed to the stretching vibration of copper oxide (Cu-O) bonds, the particle size distribution of CuO NPs revealed diverse range of particle sizes present in the sample and the surface area exhibited by CuO NPs was 138.145 m2/g. Photocatalytic treatment method, showed that the ATZ was broken down by CuO-mediated photocatalysis after 60 minutes of exposure, yielding degradation rates of 85.5% and 68.8% for ATZ concentrations of 6.25 mg/L and 100 mg/L, respectively. With kc equal to 3.315 mg/L/min and KLH equal to 3.68 x 10-2 L/mg, the treatment approach adhered to the Langmuir–Hinshelwood kinetic model. Pesticide-contaminated wastewater might therefore be successfully cleaned up by photodegrading ATZ using CuO NPs as a catalyst.

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