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风雨182木虫 (正式写手)
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| 图5是450 ℃时得到的不同掺杂TiO2降解甲基橙的降解率曲线，由图5可见，各样品具有明显的光催化活性，纯TiO2、Cd-TiO2、N-TiO2、N,Cd-TiO2的催化活性依次增强。当光照射15分钟时，纯TiO2、Cd-TiO2、N-TiO2、N,Cd-TiO2对甲基橙的降解率分别为88%、96%、97%和99%，说明元素掺杂提高了TiO2的光催化活性，N,Cd共掺杂对光催化活性的提高更明显。当光照射25分钟时，掺杂TiO2已将甲基橙降解完全。究其原因，掺杂原子的引入使得晶体的带隙变窄，光吸收范围拓展的同时光吸收增强；同时，掺杂元素使得晶体结构扭曲变形，结晶度变差，晶体的比表面积增大，会增大催化剂与底物的接触，晶体的表面缺陷会抑制催化剂表面电子-空穴对的复合，使其光催化活性增大。 |
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★ ★ ★
sirljz(金币+3):谢谢交流 2010-03-20 11:42
风雨182(金币+50):谢谢啊辛苦你啦 2010-03-20 16:36
sirljz(金币+3):谢谢交流 2010-03-20 11:42
风雨182(金币+50):谢谢啊辛苦你啦 2010-03-20 16:36
| Figure 5 is the degradation rate curve a different doped TiO2 degradation of methyl orange at 450 ℃, from Figure 5 can be seen, all samples have obvious photocatalytic activity, the pure TiO2, Cd-TiO2, N-TiO2, N, Cd - TiO2 catalytic activity more and more increased. When the light irradiation for 15 minutes, the pure TiO2, Cd-TiO2, N-TiO2, N, Cd-TiO2 on the methyl orange degradation rates were 88%, 96%, 97% and 99%, indicating element doping increases TiO2 photocatalytic activity, N, Cd co-doping on photocatalytic activity increased more obvious. When the light irradiation 25 minutes, the doped TiO2 has been methyl orange degradation completely. The reason for doping atoms into making crystal band-gap narrowing, the light absorption range of expansion, while optical absorption enhancement; the same time, doping elements makes the crystal structure distortion, crystallinity variation, the crystal surface area increase, will increase the catalyst and the substrate contact, the crystal surface defects can inhibit the catalyst surface electron - hole pairs of the compound, so that the photocatalytic activity increases. |
3楼2010-03-18 11:04:34
