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The influence of cobalt doping on photocatalytic nano-titania: Crystal chemistry and amorphicity |
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| Authors: | Suo Hon Lim Cristiano Ferraris Martin Schreyer James O Leckie |
| Institution: | a The School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, 50 Nanyang Avenue, 639798, Singapore, Singapore b Laboratoire de Minéralogie, USM 201, Muséum National d’Histoire Naturelle, CP 52, 61 Rue Buffon, 75005 Paris, France c The Department of Civil and Engineering, Stanford University, Terman Engineering Center, Stanford, CA 94305-4020, USA |
| Abstract: | Photocatalysts of nominal composition (Ti1−xCox)O2−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 Ti3+ sites were displaced by cobalt. |
| Keywords: | Anatase Rutile Amorphous content Photocatalytic activity Methylene blue Formic acid |
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