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TiO 2 is the most studied photocatalyst because of its non-toxicity, chemical stability, and low cost. However, the problem of TiO 2 is its low activity in the visible region of the spectrum. In this study, we focused on the preparation of composite photocatalytic materials with altered light absorption properties. TiO 2 P25 and various metal oxides were mechanically joined by ball-milling and immobilized on glass plates. The prepared samples were evaluated based on their ability to degrade NO in gas phase. The formation of undesirable byproducts was also investigated. Four best performing composites were later chosen, characterized, and further evaluated under various conditions. According to their performance, the metal oxide additives can be divided into three groups. P25/Fe 2 O 3 showed the most promising results-an increase in overall deNO x activity under modified ISO conditions and altered selectivity (less NO 2 is formed) under both simulated outdoor and simulated indoor conditions. On the other hand, P25/V 2 O 5 composite showed negligible photocatalytic activity. The intermediate group includes P25/WO 3 and P25/ZnO photocatalysts, whose performances are similar to those of pristine P25.

Composite TiO2-based photocatalyst with enhanced performance