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Vol.45, No.8, 484 ~ 489, 2007
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| Title |
| Biomaterials & Nanomaterials ; Synthesis and Visible Light Photocatalytic Activity of Nanocrystalline Ti02-SrO Composite Powders |
| 최성민 Sung Min Choi , 이병택 Byong Taek Lee , 홍원석 Won Seok Hong , 한재길 Jae Kil Han |
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| Abstract |
| Nano-sized and homogeneously distributed TiO2-20, -40, -60wt% SrO composite powders were successfully synthesized by a sol-gel method. The as-received amorphous TiO2-20wt% SrO composite powders were crystallized with anatase TiO2 at around 750℃. As calcination temperatures increased, the anatase TiO2 crystalline phase was transformed to rutile TiO2 at about 900℃, whereas nano-sized, squarish SrTiO3 phase was detected. The peaks obtained after calcining at 1,050℃ 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. TiO2-60wt%SrO composite powder showed good visible light photoactivity for the photo-oxidation of phenol. |
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| Key Words |
| nanoparticle, photoactivity, sol-gel method |
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