Abstract
Photocatalysts of nominal composition (Ti 1− x Co x )O 2− δ with 0.001⩽ x⩽0.05 were prepared via a sol–gel technique followed by air firing (200–1000 °C). The incorporation of cobalt inhibited crystal growth and slightly raised the anatase to rutile transformation temperature (∼700 °C). An amorphous component was invariably significant with the maximum content (41–53 wt%) appearing simultaneously with the removal of anatase, suggesting that rutile crystallizes via an aperiodic structure. While the introduction of cobalt shifted the apparent band gap to visible light energies this did not enhance performance as there was limited miscibility of cobalt in titania, non-catalytic secondary phases were present, and active Ti 3+ sites were displaced by cobalt.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have