2019 Volume 127 Issue 10 Pages 688-695
Rutile-type TiO2 was modified with NiO and CeOx using chemisorption calcination cycle method. Then the decomposition activity of 2-naphthol in water was evaluated in the dark or under visible light at 50°C. Little difference was found in the specific surface area or crystal phase before and after modification. The NiO modification decreased the apparent bandgap and provided photocatalytic decomposition activity under visible light. Results suggest that the formation of a Ti–O–Ni interfacial bond yielding a surface d sub-band plays an important role in this increased activity. Although the NiO-modified TiO2 possessed decomposition activity only under visible light, additional modification of CeOx onto the material enabled decomposition of 2-naphthol in water in the dark at 50°C. The dark activity was attributed to the Mars–van Krevelen mechanism of Ce in CeOx. The NiO-modified TiO2 exhibited high antibacterial activity against Escherichia coli and Staphylococcus aureus under visible light at room temperature.