TEM microstructure characterization of nano TiO2 coated on nano ZrO2 powders and their photocatalytic activity |
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| Affiliation: | 1. Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore;2. NUS Environmental Research Institute (NERI), #02-01, T-Lab Building (TL), 5A Engineering Drive 1, Singapore 117411, Singapore;3. Shenzhen Engineering Laboratory for Eco-efficient Polysilicate Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, PR China |
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| Abstract: | Nano TiO2 coated commercial nano ZrO2 powders (20 and 80 wt.%) were synthesized by a sol–gel process. Their microstructure and crystal structure depending on the calcination temperatures were investigated using XRD and HRTEM techniques. In the as-received powders, the nano TiO2 particles attached to the ZrO2 particles existed in an amorphous phase. After calcination at 450 and 600 °C, most of the TiO2 powders were crystallized to an anatase type, whereas at 750 °C, they were changed to a rutile phase.From the comparison of photocatalytic activity, the nano TiO2 coated ZrO2 powders calcined at 450 and 600 °C showed excellent efficiency for the removal of methyl orange (MO). However, in the powders calcined at 750 °C, the photocatalytic activity was decreased due to the appearance of a rutile phase. |
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