Photo-catalytic degradation of rhodamine 6G dye by ZnO film deposited using microwave atmospheric plasma jet

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ZnO films were deposited on soda-lime glass substrate using microwave atmospheric plasma jet device. A 10/5 LPM Ar/N2 gas and 650 W microwave absorbed power were used to produce the plasma. A 0.2M zinc acetate solution, driven by 0.3 LPM air, was mixed with the plasma via a nebulizer. The ZnO film was deposited on the substrate for 15 minutes.

The ZnO film was characterized using scanning electron microscope (SEM), X-ray diffraction (XRD) analysis, and energy dispersive x-ray (EDX) spectroscopy. 111e film , has grainy, rough, and porous microstructures as seen in Figure l(a). Based also on its 1• XRD pattern in Figure l(b), the film is polycrystalline with a wurtzite structure. Zn 101) crystallites were also observed. This is supported by the EDX analysis wherein the ratio of Zn and O is 71.87:28.13.

The film was immersed in 10 mL Rhodamine 6G dye solution and then exposed under UV light. The absorbance of the solution was measured every 5 minutes using UV-Vis spectroscopy. The concentration of the solution continuously decreased as the exposure of time was increased. After 30 minutes, the concentration decreased by about 49%. This shows that the film is an effective photo-catalyst. This is because of its porous and grainy morphology which means that more surface areas are exposed that can participate in the degradation of the Rhodamine 6G dye.





Zinc oxide thin films; Photocatalysis

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