负载贵金属光催化剂的光催化活性研究

Study of Loaded Photocatalysts by Precious Metals on the Photocatalytic Reactivity

在注入V离子的二氧化钛光催化剂上负载贵金属,制备了在可见光照射下具有高光催化活性的功能型光催化剂,研究在可见光和太阳光照射下丙炔的光催化水解反应,利用这些改性的二氧化钛构筑太阳能到化学能的转换系统.研究结果发现了V/Pt光催化剂在丙炔和水的光催化水解反应中,由于贵金属的存在,有利于促进发生加氢反应;导致丙烯的生成量增加.在可见光下的光催化活性也和负裁贵金属所处的氧化状态有着密切的关系,贵金属完全被还原到0价是提高光催化活性的必要条件。

The functional photocatalysts of high photocatalytic reactivity under visible light irradiation were prepared by loading precious metals on the vanadium ion implanted titanium oxide. The photocatalytic hydrolysis reaction of methylacetylene was studied under the visible light and solar beam. Those modified titanium oxides were used to construct conversion system of solar to chemical energy. It was found from experimental results that existance of precious metals on the V/TiO2 photocatalysts has the advantage of promotion of hydrogenation reaction in photocatalytic hydrolysis reaction of methylacetylene, and increase of propene product. The photocatalytic reactivities under visible light irradiation have a close relationship with oxidation states of the precious metals on titanium oxide and it is necessary for increasing photcatalytic reactivities that precious metals be reduced to 0 valence.