Synthesis and photocatalytic activity of nanocrystalline TiO2-SrO composite powders under visible light irradiation |
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Authors: | Jae-Kil Han Sung-Min Choi |
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Affiliation: | a Department of Surface & Nano Technology, Songdo Techno Park, Get-pearl Tower, 7-50, Songdo-dong, Yeonsu-gu, Incheon, 406-130, South Korea b Department of Chemistry, Chungnam National University, 220, Gung-dong, Yuseong-gu, Daejeon, 305-764, South Korea |
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Abstract: | Nano-sized homogeneously distributed TiO2-20, -40, -60 wt.% SrO composite powders were successfully synthesized by a sol-gel method. The as-received amorphous TiO2—20 wt.% SrO composite powders were crystallized with anatase TiO2 at around 750 °C. As calcination temperatures increased, the anatase TiO2 crystalline phase was transformed to rutile TiO2 at about 900 °C, whereas nano-sized, squarish SrTiO3 phase was detected. The peaks obtained after calcining at 1050 °C mainly exhibited the rutile TiO2 and SrTiO3 phases. However, a small number of SrO2 peaks were also detected. For the comparison of photocatalytic activity depending on light sources, TiO2-SrO composite powders were tested in phenol degradation. TiO2-60 wt.% SrO composite powder showed good visible light photoactivity for the photo-oxidation of phenol. |
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Keywords: | Nanoparticle Microstructure Photoactivity Sol-gel |
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