| 吸附相反应技术制备微弱光响应的多组分掺杂TiO2催化剂 |
| 摘要点击 1700 全文点击 875 投稿时间：2014-06-19 修订日期：2014-09-10 |
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| 中文关键词 吸附相反应技术 TiO2 微弱光催化 N掺杂 Fe2O3 |
| 英文关键词 adsorption phase synthesis TiO2 photocatalysis illuminated by weak light N doping Fe2O3 |
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| 中文摘要 |
| 利用弱光(紫外和可见)激发TiO2光降解污染物是拓展多相光催化实际应用的关键之一. 以吸附相反应技术为基础,利用N掺杂以及共掺杂两种方式制备多组分TiO2光催化剂,并研究其在弱光下光降解甲基橙的过程. 结合紫外可见漫反射光谱、X射线衍射、X射线电子能谱以及光致发光光谱等表征手段,探索焙烧温度、N掺杂量以及共掺杂对催化剂光吸收和可见光响应拓展的影响,进而研究弱光下催化剂活性的变化规律. 结果发现,N掺杂可以显著增强催化剂的光吸收,从而显著提升其在弱紫外光下光降解甲基橙催化活性,所有N掺杂催化剂的活性均优于商用P25光催化剂. N掺杂对催化剂的可见光响应拓展作用不大,因而单一N掺杂后大部分催化剂在弱可见光下没有活性,仅5% N掺杂催化剂在900℃热处理后有微弱活性. N和Fe2O3二元耦合形成的共掺杂催化剂中,两者之间的协同作用既增强了复合光催化剂的光吸收,也显著拓展了催化剂的可见光响应,因而得到了在弱可见光下具有良好活性的复合光催化剂. |
| 英文摘要 |
| Photodegradation of pollutions by TiO2 under irradiation of weak UV and visible lights was one of the key points to expand the application of heterogeneous photocatalysis. Based on the adsorption phase synthesis, N doping and co-doping with N and Fe2O3 were employed to prepare TiO2 multi composite photocatalysts. The activity of these photocatalyts was evaluated by photodegradation of methyl-orange illuminated under weak UV and visible lights. Via UV-Vis diffuse reflectance spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and photoluminescence spectra, the effects on the light absorption and visible response expansion of catalysts caused by different conditions were explored, such as sintering temperature, doping content of N and co-doping. Followed that, the changes in the photocatalytic activities were studied under the irradiation of weak light. The results showed that, N doping could enhance the light absorption of the catalysts, thus significantly enhanced their photocatalytic activity illuminated under UV weak light. All N-doped photocatalysts had a higher activity than the commercial available P25 photocatalyst. The visible response of catalysts was expanded little caused by N doping, thereby most catalysts doped by single N element had no activity illuminated by weak visible light. Only the catalyst doped with 5% of N element showed a weak activity after calcined at 900℃. Due to the synergy effects between N doping and Fe2O3 coupling, co-doping did not only enhance the light absorption of the catalysts, but also significantly expanded the visible response of catalysts. So, co-doped catalysts showed a good catalytic activity when excited by weak visible light. |
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