Nano Silver Tungsten Oxide Photocatalyst Coatings

There are many materials that can be used as photocatalyst in the world, including titanium dioxide (titanium dioxide), zinc oxide (zinc oxide), tin oxide (SnO₂), zirconium dioxide (ZrO₂), tungsten trioxide (WO₃) and other oxide sulfide semiconductors. Among them, titanium dioxide is the most common Nano-Photocatalyst material in the world because of its strong oxidation ability, stable chemical properties and non-toxic.

However, the gap between the conduction band and the valence band of titanium dioxide is 3.2eV, which only reacts to ultraviolet radiation. Correspondingly, tungsten trioxide has a band gap of 2.5eV, which can be used as visible light response photocatalyst. It is harmful and cheap, and has a wide application prospect. But at present, the activity of tungsten oxide products is not good, and the photocatalyst effect is poor. In order to improve the photocatalytic performance of tungsten oxide, the researchers used tungsten oxide photocatalyst coatings modified by nano noble metals. The process included:

(a)Tungsten trioxide powder is added into the deionized water according to the ratio, and ultrasonic dispersion is 0.8-1.2 h;

(b)Adding strong acid to the solution obtained in step (a), controlling the pH value of the solution to be 2-5, and then continuing the ultrasonic dispersion for 0.8-1.2 h;

(c)The nano precious metal solution is added to the solution obtained by step (b) and dispersed by ultrasound for 20-40 minutes.

Nano precious metals are nano-sized powders of gold, silver and platinum. Generally, silver nano-materials are the most common, because silver has the lowest price compared with other precious metals, and has natural antimicrobial and disinfectant effects.

Nano silver tungsten oxide photocatalyst coatings have high reaction activity and meet the requirements of environmental protection. After spraying and drying, visible light response photocatalyst coatings with high activity can be further prepared.

• < Prev
• Next >