• Judith Chebwogen Koskey Kabarak University




While the sixth sustainable development goal to be achieved by 2030 is clean water and sanitation, there is still a global challenge in the supply of adequate clean water due to population growth and urbanization. This necessitates coming up with more affordable approaches of managing waste water. Photocatalytic degradation of pollutants has proved to be one of the promising ways of purifying water. This study aimed at preparing Cobalt doped ZnO films to be used in photocatalytic water purification. ZnO films were fabricated by anodization and Cobalt incorporated. Heat treatment was done at 2500C. Optical characterization was done using a UV-VIS NIR spectrophotometer to obtain reflectance data which aided in determining the optical properties of the films. Data analysis showed a decrease in ZnO reflectance and optical band gap on incorporation of Cobalt. This implied an increase in the absorption of the films which is a fundamental property in photocatalytic water purification. Hence Cobalt doped ZnO films have good photocatalytic properties and can be used for photocatalytic water purification.


Download data is not yet available.

Author Biography

Judith Chebwogen Koskey, Kabarak University

Student, Department of Biological and Physical Scieces


Borhani Zarandi, M., & Amrollahi Bioki, H. (2017). Effects of Cobalt Doping on Optical Properties of ZnO Thin Films Deposited by Sol–Gel Spin Coating Technique. Journal of Optoelectronical Nanostructures, 2(4), 33-44.

Hoffmann, M. R., Martin, S. T., Choi, W., & Bahnemann, D. W. (1995). Environmental applications of semiconductor photocatalysis. Chemical reviews, 95(1), 69-96.

Kulkarni, S. S., & Shirsa, M. D. (2015). Optical and structural properties of zinc oxide nanoparticles. IJARPS, 2, 14-18.

Kuriakose, S., Satpati, B., & Mohapatra, S. (2014). Enhanced photocatalytic activity of Co doped ZnO nanodisks and nanorods prepared by a facile wet chemical method. Physical Chemistry Chemical Physics, 16(25), 12741-12749.

Nagaraju, G., Shivaraju, G. C., Banuprakash, G., & Rangappa, D. (2017). Photocatalytic activity of ZnO nanoparticles: synthesis via solution combustion method. Materials Today: Proceedings, 4(11), 11700-11705.

Nemes, D., Moldovan, V., Bruj, E., Jumate, N., & Vida-Simiti, I. (2011). Porous anodic alumina films obtained by two step anodization. Bulletin of the Transilvania University of Brasov. Engineering Sciences. Series I, 4(2), 75.

Poongodi, G., Anandan, P., Kumar, R. M., & Jayavel, R. (2015). Studies on visible light photocatalytic and antibacterial activities of nanostructured cobalt doped ZnO thin films prepared by sol–gel spin coating method. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 148, 237-243

Woo, H. S., Kwak, C. H., Chung, J. H., & Lee, J. H. (2014). Co-doped branched ZnO nanowires for ultraselective and sensitive detection of xylene. ACS applied materials & interfaces, 6(24), 22553-22560.



How to Cite

Judith Chebwogen Koskey. (2019). OPTICAL CHARACTERIZATION OF CO:ZNO FILMS FABRICATED BY ANODIZATION FOR PHOTOCATALYTIC WATER PURIFICATION. Kabarak Journal of Research & Innovation, 8(1), 1–7. https://doi.org/10.58216/kjri.v8i1.114