Visible light-induced degradation of ethylene glycol on nitrogen-doped TiO2 powders.
Visible light-induced degradation of ethylene glycol on nitrogen-doped TiO2 powders.
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DOI：
10.1021/jp0620217
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发表时间：
2006-06
期刊：
影响因子：
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通讯作者：
T. Tachikawa;Y. Takai;S. Tojo;M. Fujitsuka;H. Irie;K. Hashimoto;T. Majima
中科院分区：
文献类型：
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作者：
T. Tachikawa;Y. Takai;S. Tojo;M. Fujitsuka;H. Irie;K. Hashimoto;T. Majima
采用时间分辨漫反射光谱（TDR）和固体核磁共振（NMR）研究了纯TiO 2和掺氮TiO 2（TiO（2-x）N（x），x = 0，0.002，0.003和0.007）粉体在紫外光和可见光照射下对乙二醇（EG）的光催化降解过程。的TDR光谱和观察到的电荷载流子的时间轨迹表明，由EG的光生空穴（h+）的清除发生在355-nm的N-掺杂的TiO 2粉末的激光光解，而没有直接的氧化反应的EG由h+发生在460-nm的激光光解，虽然电荷载流子被充分激发后产生。固态魔角旋转（MAS）NMR测量结果表明，EG是优先化学吸附在表面上的N-掺杂的TiO 2粉末，在纯TiO 2的对比，并在可见光照射下降解。
The photocatalytic degradation processes of ethylene glycol (EG) during the UV or visible light irradiation of pure anatase and nitrogen (N)-doped TiO2 powders (TiO(2-x)N(x), x = 0, 0.002, 0.003, and 0.007) were investigated using time-resolved diffuse reflectance (TDR) and solid-state NMR spectroscopies. The TDR spectra and time traces observed for the charge carriers indicated that the scavenging of photogenerated holes (h+) by EG occurred during the 355-nm laser photolysis of the N-doped TiO2 powders, while no direct oxidation reaction of EG by h+ occurred during the 460-nm laser photolysis, although the charge carriers were sufficiently generated upon excitation. The solid-state magic-angle spinning (MAS) NMR measurements revealed that EG is preferentially chemisorbed on the surface of the N-doped TiO2 powders, in contrast to the pure TiO2, and degrades under visible light irradiation.