Preparation of nitrogen-doped titania with high visible light induced photocatalytic activity by mechanochemical reaction of titania and hexamethylenetetramine
Preparation of nitrogen-doped titania with high visible light induced photocatalytic activity by mechanochemical reaction of titania and hexamethylenetetramine
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DOI：
10.1039/b309217h
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发表时间：
2003-01-01
影响因子：
--
通讯作者：
Sato, T
中科院分区：
文献类型：
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作者：
Yin, S;Yamaki, H;Sato, T
采用机械化学法制备了氮掺杂的淡黄色金红石型二氧化钛。在室温下，在不同的球磨条件下，通过高能球磨P-25二氧化钛粉末与不同量的六亚甲基四胺（HMT）来制备样品。详细研究了反应条件对产物的相组成、粒径、比表面积、掺氮量、微观结构以及对NO分解性能的影响。高机械能加速了由金红石相向金红石相的转变，而HMT的存在则抑制了相变。残留的HMT和副产物可以通过在空气中在400 ℃下的后研磨煅烧来去除。氮掺杂的黄色二氧化钛在400和550 nm附近具有两个吸收边，在可见光照射下对一氧化氮的氧化具有良好的光催化性能。用波长>510 nm的可见光照射允许通过P-25二氧化钛-10 wt% HMT混合物在700 rpm行星式球磨120 min，然后在空气中在400 ℃煅烧制备的氮掺杂二氧化钛连续去除近37%的一氧化氮。
Nitrogen-doped yellowish rutile titania was prepared by a mechanochemical method. The samples were prepared by high-energy ball milling of a P-25 titania powder with various amounts of hexamethylenetetramine (HMT) under different milling conditions at around room temperature. The effects of the reaction conditions on the phase composition, particle size, specific surface area, amount of nitrogen-doping, microstructure and photocatalysis of nitrogen monoxide destruction were investigated in detail. The high mechanical energy accelerated the transformation of the phase from anatase to rutile, while the presence of HMT decreased the phase transformation. Residual HMT and by-products could be removed by post-milling calcination in air at 400degreesC. The nitrogen-doped yellowish titania possessed two absorption edges at around 400 and 550 nm and showed excellent photocatalytic ability for nitrogen monoxide oxidation under visible light irradiation. Irradiation with visible light of wavelength >510 nm allowed nearly 37% nitrogen monoxide to be continuously removed by the nitrogen-doped titania prepared by planetary ball milling of a P-25 titania-10 wt% HMT mixture at 700 rpm for 120 min followed by calcination in air at 400degreesC.