Synthesis of ZnO/CuO Composite by Microwave Method for Photocatalytic Degradation of Rhodamine B
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Abstract
Zinc oxide/cupric oxide (ZnO/CuO) composite with a high crystallinity and purity phase without impurity was successfully synthesized via a microwave method for use as a photocatalyst in the degradation of rhodamine B. The synthesis process used zinc acetate and cupric acetate as precursors. The suspensions were treated via microwave irradiation at 450 W for 10 min followed by a constant-temperature calcination process at 300๐C for 3 h. The phase transitions, functional group, morphologies, and elemental compositions of the resulting synthesized powders were characterized via X-ray powder diffraction, Scanning Electron Microscopy, and Energy dispersive X-ray spectroscopy. ZnO/CuO crystals were found to be mixed phases of hexagonal zinc oxide and monoclinic cupric oxide. The functional group is composed of Zn-O and Cu-O bonds. The morphology is agglomerate granular with a particle size of 0.25 x 0.47 µm. The elemental compositions contain Zn, Cu, and O with 35.8%, 32.6%, and 15.8%, respectively. The experimental findings showed that the microwave method is the cause of favorable chemical and physical properties for the photocatalytic powder reaction, such as high purity phases, high crystallinity, and high uniformity of the ZnO/CuO powders. The photocatalytic degradation of rhodamine B using these ZnO/CuO powders under UV light illumination was studied. The rhodamine B concentration analysis was done using UV-Vis spectrophotometry. The highest rhodamine B degradation efficiency by the ZnO/CuO was 80.68 % in 240 min at a kinetic rate constant of 0.0065 min -1.
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