Enhancing thermal stability and photocatalytic activity of anatase-TiO2 nanoparticles by co-doping P and Si elements
Enhancing thermal stability and photocatalytic activity of anatase-TiO2 nanoparticles by co-doping P and Si elements
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DOI：
10.1016/j.jallcom.2009.12.021
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发表时间：
2010-03
影响因子：
6.2
通讯作者：
Hsuan-Fu Yu;Shihe Yang
中科院分区：
文献类型：
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作者：
Hsuan-Fu Yu;Shihe Yang
采用溶胶凝胶法合成了摩尔比为[Si+P]/[Si/P-TiO2]=0.03的Si/P-TiO2纳米粒子。考察了掺杂剂的相对比例(即R≡[P]/([Si+P]))和焙烧温度对凝胶法制备的Si/P-TiO2光催化剂的相变、晶粒生长和光催化活性的影响。当Si-Ti02(即R=0)的锐钛矿型结构在700C下稳定2小时时，Si/P-TiO2光催化剂(即0.33≤R<；1)和P-TiO2(即R=1)在900℃的温度下仍能保持锐钛矿型的TiO2，虽然在900℃时，Si/P-TiO2纳米粒子中的磷元素被部分排斥在粒子表面，并倾向于将相邻粒子融合在一起，这可能会导致其比表面积和光催化活性大幅下降，但高硅含量的Si/P-TiO2粒子，如R=0.5和0.33的粒子，仍然是松散堆积的纳米粒子，表现出良好的光催化性能。在365 nm紫外光和白光照射下，600-900°C焙烧的R=0.5的Si/P-TiO2纳米粒子具有较好的光催化活性。
The Si/P–TiO2nanoparticles, with a molar ratio [Si+P]/[Si/P–TiO2]=0.03, were synthesized using a sol–gel method. The effects of relative ratios of dopants (i.e., R≡[P]/([Si+P]) and calcination temperatures on phase transformation, grain growth, and photocatalytic activity of the gel-derived Si/P–TiO2were examined. While the Si–TiO2(i.e., R=0) had its anatase structure stabilize at 700°C for 2h, the Si/P–TiO2(i.e., 0.33≤R<1) and P–TiO2(i.e., R=1) were able to preserve the anatase-TiO2at temperature as high as 900°C. Although at 900°C the phosphorus elements in Si/P–TiO2nanoparticles were partly excluded to the particles’ surface and tended to fuse the adjacent particles together, which may lead to a large reduction in their specific surface areas and photocatalytic activities, the Si/P–TiO2with high silicon contents, such as the particles of R=0.5 and 0.33, were still composed of loosely packed nanoparticles and showed good photocatalytic ability. In whole, the Si/P–TiO2nanoparticles of R=0.5 calcined at 600–900°C gave the superior performance in photocatalytic activity, under both 365-nm UV light and white light irradiation.