Abstract
This study aimed to extend the application of plasma electrolytic oxidation (PEO) process to the production of immobilized composite photocatalysts with sensitizing nanoparticles (NPs) on the metallic substrate. For this purpose, the immobilized Fe2O3/TiO2 layers with different amounts of sonochemically synthesized Fe2O3 NPs were prepared on the titanium substrate using the PEO method and their structural, morphological, optical, and photocatalytic properties were investigated. The results showed that the immobilized Fe2O3/TiO2 layers with pancake-like morphology were homogeneously formed and the Fe2O3 NPs were uniformly embedded. The participation of the Fe2O3 NPs in layer formation events resulted in the phase transformation of anatase to rutile and an increase in the number of small surface pores. With the increment in the amount of incorporated Fe2O3 NPs, the absorption band-edge of immobilized layers shifted to the longer wavelengths and their light utilization from the visible region of the solar radiation spectrum considerably increased. As a result of these changes, the degradation efficiency of methylene blue aqueous solution under ultraviolet irradiation significantly enhanced with adding 3 g.L−1 Fe2O3 NPs to the phosphate-based electrolyte.
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