Formation of cobalt-doped zinc oxide photocatalyst for synthetic methyl orange degradation

Birang, Katerina (2016) Formation of cobalt-doped zinc oxide photocatalyst for synthetic methyl orange degradation. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Doping process is one of the method to enhance the photocatalytic activity of metal oxide in methyl orange (MO) dye solution. This report covers on doping of Cobalt (II) acetate tetrahydrate into zinc oxide (powder form) by using sol gel method. Material characterization done using FESEM, XRD, FTIR and RAMAN to identify the morphology and structure of pure ZnO and Co-doped ZnO. The presence of hexagonal wurtzite structure and zincite structure is confirmed using XRD analysis whereas ZnO nanorod and nanodisk morphology presence in photocatalysts analysed using FESEM image. Morphology and structure of ZnO give effect on degradation performance of methyl orange. Doping process makes Co ions substituted ZnO ions in ZnO crystal lattice. Photocatalytic activity analysed by exposed MO dye solution contain photocatalyst to UV light irradiation. As the exposure time increase, the concentration of dye solution decrease. Surprisingly, pure ZnO shows high photocatalytic activity than Co-doped ZnO. This phenomena correlates to amount of dopant level and also oxygen vacancy of photocatalyst. After 6 hours of UV light irradiation, pure ZnO shows 100% degradation of MO dye, 1wt% Co (47%), 3wt% Co (39%), 6wt% Co (23%), 9wt% Co (27%) and 12wt% Co (22%).

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