Influence of the deposition method on the characteristics of ZnO films for photocatalytic applications

Abstract

Contaminants of emerging concern have received considerable attention due to their potential adverse effects on aquatic systems, flora, fauna, and human health. Azo dyes represent a significant category of toxic organic contaminants. Heterogeneous photocatalysis offers an effective green alternative for the degradation of organic pollutants, particularly in wastewater treatment. This research aimed to synthesize and characterize nanostructured zinc oxide films to develop a UV-light activated photocatalyst capable of degrading organic compounds. The films were synthesized via the sol-gel method, and deposited on borosilicate glass substrates by spray coating and spray pyrolysis techniques. The samples underwent heat treatment at varying times and temperatures. The photocatalytic efficiency was evaluated by the methyl orange dye discoloration under UVA radiation. Wurtzite structure was observed in all conditions. Differences in surface morphology, band gap energies, and photocatalytic performance were also noted. Both methods enabled the production of UVA-photoactived films.