Ammonium Tungsten Bronze--Titanium Dioxide Composite Photocatalyst

With the improvement of science and technology level and the progress of human development level, environmental pollution is becoming more and more serious, toxic and difficult to degrade. Pollutants are more and more widespread in the air, which is harmful to biological safety and ecosystem, and restricts the progress of society.

Semiconductor materials, such as titanium dioxide, have attracted much attention due to their high photocatalytic activity, good stability and low cost. However, the traditional photocatalytic materials can only use ultraviolet light in sunlight because of their wide band gap, and ultraviolet light only accounts for 4% of the total energy of sunlight. Therefore, extending the response wavelength of photocatalytic materials to the full spectrum including visible and infrared regions is one of the hotspots in the field of photocatalytic research, and is also the key to its practical application.

It is found that ammonium tungsten bronze has excellent infrared absorption effect. If it can be compounded with existing titanium dioxide materials, it is of great significance to obtain full-band photocatalytic materials that can absorb and utilize the solar spectrum and expand the application fields of existing photocatalytic materials in order to effectively alleviate the current environmental pollution and energy shortage.

The preparation process of ammonium tungsten bronze-titanium dioxide composite photocatalyst: 0.1-1.0g raw material ammonium tungstate was added to 20-80mL ethylene glycol, magnetic stirring was carried out at 80-200 ~℃, then 0.1-1.0g raw material titanium dioxide was added after cooling to room temperature, then ultrasonic dispersion was stirred to obtain suspension; 10-80mL acetic acid was added to the suspension and stirred to obtain mixed liquid. The hydrothermal reaction lasted for 10-72 h at 160-240 ℃. Then the precipitates were centrifugally washed and dried with deionized water and ethanol respectively to obtain ammonium tungsten bronze-titanium dioxide composite photocatalyst.

Compared with titanium dioxide, ammonium tungsten bronze-titanium dioxide composite photocatalyst not only enhances its photocatalytic activity under ultraviolet light, but also has photocatalytic activity under visible light and even infrared spectrum. It realizes the absorption and utilization of sunlight, and has broad application prospects in the field of environmental pollution control and purification and environmental protection functional materials.

• < Prev
• Next >