Direct Solvothermal Formation of Nanocrystalline TiO2 on Porous SiO2 Adsorbent and Photocatalytic Removal of Nitrogen Oxides in Air over TiO2–SiO2 Composites
Direct Solvothermal Formation of Nanocrystalline TiO2 on Porous SiO2 Adsorbent and Photocatalytic Removal of Nitrogen Oxides in Air over TiO2–SiO2 Composites
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DOI：
10.1007/s11244-007-9016-5
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发表时间：
2008-02
影响因子：
3.6
通讯作者：
H. Kominami;Kimiyo Yukishita;Takashi Kimura;M. Matsubara;K. Hashimoto;Y. Kera;B. Ohtani
中科院分区：
文献类型：
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作者：
H. Kominami;Kimiyo Yukishita;Takashi Kimura;M. Matsubara;K. Hashimoto;Y. Kera;B. Ohtani
钛(IV)叔丁基氧化物(TTB)在硅胶(SiO_2)存在下，在573℃的甲苯中连续搅拌，在甲苯中进行溶剂热分解，得到了TiO_2-SiO_2复合材料，在SiO_2颗粒表面沉积了纳米级的TiO_2。通过改变TTB与SiO_2的比例，可以制备出不同二氧化钛含量的TiO_2-SiO_2复合材料，并且复合材料具有与SiO_2相对应的较大的比表面积。将其用于光催化脱除空气中的氮氧化物，并与不同方法制备的二氧化钛-二氧化硅样品的光催化性能进行了比较。溶剂热法合成的74wt.%的二氧化钛-二氧化硅复合材料表现出优异的光催化性能(近化学计量比的NOx脱除(98%)和极低的NO2释放量(0.3%))，这归因于二氧化钛的高催化活性和二氧化硅的高吸附性能。用其他方法制备的74wt.%的二氧化钛-二氧化硅复合材料的光催化性能较差，表明二氧化钛对二氧化硅的孔口堵塞以及二氧化钛和二氧化硅的较低混合水平降低了复合材料的光催化性能。
Solvothermal decomposition of titanium(IV) tert-butoxide (TTB) in toluene at 573 K in the presence of silica gel (SiO2) with continuous stirring yielded a titanium(IV) oxide (TiO2)–SiO2composite in which agglomerates of nanocrystalline TiO2were deposited on the surfaces of SiO2particles. Various TiO2–SiO2composites having different TiO2contents can be synthesized by changing the ratio of TTB and SiO2, and the composites had large surface areas corresponding to porous properties of SiO2. These TiO2–SiO2composites were used for photocatalytic removal of nitrogen oxides in air and their photocatalytic performances were compared with those of other TiO2–SiO2samples prepared by different methods. Solvothermally synthesized 74 wt.%TiO2–SiO2composite exhibited excellent photocatalytic performance (almost stoichiometric removal of NOx(98%) and very low NO2release (0.3%)) attributable to high photocatalytic activity of TiO2and high adsorption property of SiO2. Lesser performance of 74 wt.%TiO2–SiO2composites prepared by other methods suggested that pore-mouth plugging of SiO2by TiO2and lower level of mixing of TiO2and SiO2decreased photocatalytic performance of the composites.