Abstract
Abstract TiO2 is the most promising photocatalyst to decompose industrial pollutants in water and air. Compared with TiO2 powder, the immobilized form is more suitable for application. In the present paper, the nanostructured TiO2 photocatalyst is formed by thermal spraying with liquid feedstock. The microstructure of the nanostructured TiO2 is characterized by infrared spectrum, X-ray diffraction, scanning electron microscope, and transmission electron microscope. The photocatalytic performance is characterized with photodegradation of phenol in aqueous solution. The effects of annealing treatment on the crystalline structure of the TiO2 deposit and the photocatalytic performance are investigated. The results showed that TiO2 photocatalyst deposited by thermal spraying with liquid feedstock presents nanostructure and anatase crystalline structure mainly. The crystalline structure of TiO2 deposit can be controlled by post annealing treatment. The as-sprayed TiO2 coating can decompose phenol in water with the presence of H2O2 and UV light. Phenol can be destroyed easily while the complete mineralization takes a little more time. Annealing treatment can improve the photocatalytic performance of TiO2 coating. The present results revealed that the TiO2 coating in rutile structure presents a better photocatalytic performance compared with as-sprayed TiO2 coating in anatase structure.
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