The following is to introduce how nano tungsten trioxide is photocatalyzed. Firstly, preparing for a nano tungsten trioxide, then text it photocatalytic properities of water cracking into oxygen and protons. Because the nano tungsten trioxide lack of quality of metals, it almost no catalysis. Secondly, adding a small amount of platinum and ruthenium dioxide into nano tungsten trioxide to improve its catalytic performance. And it turns out that the absorption band of nano tungsten trioxide becomes wider from narrow, the absorption of light in the long wave region is increased. Although a bit of platinum and ruthenium dioxide did not change the specific surface area of nano tungsten trioxide, they make the photocatalysis of nano tungsten trioxide was significantly enhanced and the long-term activity was also enhanced.
Because the photocatalytic properties of composite semiconductors are better than those of unite semiconductors, two kings of semiconductors can be coupled to the catalyst which can make the system increasing the effect of charge separation and expanding the range of laser energy, in order to improve the efficiency of photocatalysis. The composite of nano tungsten trioxide and titanium dioxide has higher degradation than that single nano tungsten trioxide and titanium dioxide. It is the best choice to compose the nano tungsten trioxide and titanium dioxide to nanometer photocatalyst which has better activity.
Nano tungsten trioxide has high selectivity for many reactions, so it is a kind of high quality photocatalytic material in the emerging field of photocatalysis.
