Visible light photocatalysis in transition metal incorporated titania-silica aerogels
Visible light photocatalysis in transition metal incorporated titania-silica aerogels
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DOI：
10.1016/j.apcatb.2003.10.006
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发表时间：
2004-03
影响因子：
22.1
通讯作者：
Jiaqiang Wang;S. Uma;K. Klabunde
中科院分区：
文献类型：
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作者：
Jiaqiang Wang;S. Uma;K. Klabunde
将过渡金属盐添加到TiO 2-SiO2混合气凝胶中。所得的M-TiO 2-SiO 2（M =过渡金属，通常以氧化物形式存在）材料具有非常高的表面积（600- 1000 m2/g）和孔体积（1- 4cm 3/g），并且含有高度分散的过渡金属氧化物。几种样品是使用可见光将乙醛氧化成二氧化碳的活性光催化剂;特别是铬、钴和镍。这些紧密的气凝胶混合物只有在SiO2存在时才具有活性（即M-TiO 2气凝胶不存在）。过渡金属离子（例如Cr 6+、Co 3+）的高氧化态似乎在产生可见光光催化剂活性方面是重要的。
Transition metal salts were added to aerogels of TiO2–SiO2mixtures. The resulting M–TiO2–SiO2(M = transition metal, in general present in the form of oxides) materials had very high surface areas (600–1000m2/g) and pore volumes (1–4cm3/g), and contained highly dispersed transition metal oxides. Several samples were active photocatalysts for acetaldehyde oxidation to carbon dioxide using visible light; in particular chromium, cobalt, and nickel. These intimate aerogel mixtures were only active when SiO2was present (i.e. M–TiO2aerogels were not). High oxidation states of the transition metal ions (e.g. Cr6+, Co3+) appear to be important in bringing about visible light photocatalyst activity.