Nano WO3 has a large specific surface area and a significant surface effect, and is a good catalyst, which can be used as both a main catalyst and a co-catalyst, and has a high selectivity for the reaction. WO3 has a strong ability to absorb electromagnetic waves, and can be used as an excellent solar energy absorbing material and a recessive material. WO3 is an n-type semiconductor material with excellent gas sensitivity and sensitivity to various gases such as NOx, HS, NH, H2, O3, etc., so it can be used to make gas sensors and gas-chromic devices. In addition, the band gap energy of tungsten trioxide is about 2.5 eV, and it has potential photocatalytic ability in visible light with wavelength < 500 nm. Therefore, WO3 has a potential application prospect in the treatment of organic dye-contaminated water.

Applications in the field of gas sensing

With the development of industrial and agricultural modernization, timely and accurate detection, forecasting and automatic control of flammable, explosive, toxic and harmful gases have become an important issue to be solved urgently in coal, petroleum, chemical, electric power and other departments. A gas sensor is a device that converts gas species and its concentration-related information into electrical signals. According to the strength of these electrical signals, information related to the existence of the gas to be tested in the environment can be obtained, so that detection, monitoring and alarm can be carried out; an automatic detection, control and alarm system can also be formed through the interface circuit and the computer.

Tungsten trioxide (WO3) is a wide bandgap n-type semiconductor, and its excellent sensitivity and selectivity make it an important metal oxide gas sensing material. The WO3 sensor was first used to detect H2S and H25. After some scholars reported for the first time in 1992 that the coating of WO3 sinter had good selectivity for very low concentrations of NOx, other researchers obtained high sensitivity and high sensitivity by adding precious metals (Pd, Pt, Au) to it. Selective WO3 gas-sensing material prepares a sensor with a faster response to NOx. Nano tungsten trioxide mainly has the following application fields in gas sensing:

(1) It is used for flammable gas leakage alarms and humidity sensors. The detected gases mainly include CO, CH4, H2, NH3, NO2, SO2, etc., which are mainly used in environmental monitoring.

(2) In terms of civil use, it can detect the leakage of civil gas such as natural gas, petroleum liquefied gas and city gas and the gas generated when cooking food in the microwave oven, so as to automatically control the cooking of food in the microwave oven. It can also detect some difficult problems in public places such as houses and buildings. smell of gas.

(3) In the industrial aspect, it is used to detect highly toxic gases such as carbon dioxide, nitrogen oxides, and sulfur oxides in the petrochemical industry; to detect hydrogen generated during the deterioration of power transformer oil; to detect the freshness of perishable foods such as meat; It can also detect the concentration of ethanol gas in the exhaled breath of drivers in road traffic, prevent drunk driving and reduce traffic accidents.

Applications in the field of photocatalysis

With the development of science and technology and the progress of society, the content of refractory organic matter in the air and wastewater is increasing, which seriously threatens human health, which has attracted great attention. With the continuous growth of people's awareness of environmental protection and resource recycling, there are more and more researches on the degradation of organic pollutants. Photocatalytic degradation of organic matter is a new technology, which uses sunlight to degrade organic matter, saves energy and does not pollute the environment, and has great application prospects.

There are many types of n-type semiconductors as photocatalysts, such as TiO2, ZnO, Fe2O3, CdS and WO3. Studies have shown that WO3 has good photocatalytic stability, and also has an ideal catalytic effect on photocatalytic degradation of pollutants in water. Moreover, my country is rich in tungsten reserves, ranking first in the world, and WO3 has a wide range of sources.

Nano tungsten trioxide mainly has the following applications in photocatalysis:

(1) Application in the field of air purification

Photocatalysis technology in the field of air purification means that photocatalysis can directly use oxygen in the air as an oxidant, effectively decompose indoor and outdoor organic pollutants, oxidize and remove nitrogen oxides, sulfides and various odors in the atmosphere, and The reaction conditions are mild, and it is a very convenient air purification technology.

(2) Application in pharmaceutical wastewater

With the rapid development of the pharmaceutical industry, while bringing huge economic benefits, the waste water discharged from it is also increasingly polluting the environment. Pharmaceutical wastewater has high organic concentration, poor biodegradability, deep color, complex composition, and contains petroleum, amine, acid demulsifier and other pollutants. It is a refractory organic wastewater, which brings unpredictable effects and harm to the ecosystem what. Therefore, in recent years, there have been more and more studies on the degradation of organic pollutants by photocatalytic oxidation at home and abroad.

(3) Application in wastewater treatment

In 1985, some scholars first reported the experiment of treating printing and dyeing wastewater with WO3 as a photocatalyst. The results showed that when visible light irradiated the semiconductor powder suspended in the aqueous solution, the dye was decomposed into CO2, H2O, N2, etc., thus reducing the COD. and chromaticity. In order to improve the removal rate of COD and chroma of printing and dyeing wastewater, an appropriate amount of CdS and a small amount of metal W powder can be mixed into the matrix WO3. The advanced treatment of wastewater was carried out by using the multiphase photocatalyst WO/CdS/W.

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