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氮掺杂TiO2的冲击合成及可见光催化活性研究

DOI: 10.11858/gywlxb.2013.01.007, PP. 51-56

Keywords: 二氧化钛,冲击合成,氮掺杂,光催化降解

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Abstract:

冲击相变及冲击诱导化学反应可导致材料的物理、化学性能发生显著改变。采用炸药爆轰驱动飞片高速碰撞产生冲击波的方法,对富氮掺杂物双氰胺(C2N4H4)与P25TiO2或偏钛酸(H2TiO3)的粉末混合物进行冲击加载,对回收产物进行X射线粉末衍射、透射电子显微镜、X光电子能谱、比表面积及紫外-可见漫反射光谱表征,通过亚甲基蓝和罗丹明B评价了回收产物的可见光催化降解活性。结果表明:以P25TiO2为原料的冲击氮掺杂浓度可达8.88%,掺杂样品具有明显的可见光吸收,能带宽度减小到1.75eV,样品中形成了少量Srilankite高压相;而以偏钛酸为原料的冲击氮掺杂浓度为3%~4%,能带宽度变化较小,但是由于其独特的冲击脱水膨胀机理,比表面积剧增。冲击氮掺杂样品对亚甲基蓝和罗丹明B染料有较好的吸附和可见光催化降解作用,其中高飞片速度处理的样品有更高的光催化降解活性。

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