Tungsten Oxide

The specific surface area is the total area of the unit mass material, the unit is m 2  / g. Generally refers to a specific surface area of a solid material, such as powders, fibers, particles, and other bulk materials. It is difficult to measure the surface area of powder or porous material. They not only have irregular outer surface, but also complex inner surface. They have large specific surface area and large activity, so they have strong adsorption ability. Tungsten powder specific surface area is usually 0.01m 2 /g (coarse tungsten powder) to 12m 2 /g (fine tungsten powder), sintering active surface area is a measure of tungsten powder (solid state sintering), dissolution characteristics (liquid phase sintering) and reaction ability in the carbonization process and gas solid material between the main index. According to the specific surface area value, the average particle size of tungsten powder can be calculated, and the reduction effect of tungsten powder

Tungstate is a typical self-activated luminescent material. Its luminescence spectrum is very stable, and its intrinsic luminescence spectrum is very wide and occupies most of the visible region. The cation in the tungstate strongly affects the position of the emission band. With the increase of atomic number of the cation, the peak shift of the emission band is blue, and the bandwidth is from 250 to 300 nm. It was not long before Roentgen discovered X-rays in 18 century, people use the penetrating power of the rays to check the internal condition of the human body or objects, and to observe or photograph the image directly by the enhancement of the ray emitting material. In 1896 found that CaWO 4  can be used as phosphor, in 1906, Puppin first used CaWO 4  as X-ray luminescent material. In 1916, Patterson made it a luminescent material for X-ray intensifying screen. In recent years, a great deal of research work has been done on the luminescence properties of single tu

With the rapid development of industry, while bringing great economic benefits, the environmental pollution caused by the waste water is also becoming more and more serious. Organic industrial wastewater with high concentration and low biodegradability, deep color, complex composition, containing oil, acids, amines, demulsifier and other pollutants, organic wastewater is difficult to degrade, bring unpredictable effects and harm to the ecological system. The photocatalytic purification of organic compounds in water is a new technology, which uses the sun to degrade organic matter, energy saving and no pollution to environment, has great application prospect. Nano tungsten trioxide is a high quality n-type semiconductor material, as photocatalyst, n-type semiconductor has many kinds, such as TiO 2 , ZnO, Fe 2 O 3 , CdS and WO 3 . The results show that WO 3  has good photocatalytic stability and is an ideal catalyst for photocatalytic degradation of pollutants in water

With the growing awareness of environmental protection and recycling of resources, more and more researches are being made on the degradation of organic pollutants. The photocatalytic degradation of organic compounds is a new technology, which uses sunlight to degrade organic compounds, saves energy and does not pollute the environment. Therefore, it has great application prospects. Nano tungsten trioxide is a high quality n-type semiconductor material, as a photocatalyst, WO 3  photocatalytic stability is good, photocatalytic degradation of air pollutants also has an ideal catalytic effect, and China is rich in tungsten reserves, ranking first in the world, WO 3  has a wide range of sources. In the role of purification of air, the main goal of nano tungsten trioxide is to improve the energy utilization efficiency of hydrogen and oxygen. Some scholars have summarized the nano tungsten oxide as a catalyst for several key factors: (1) Nanostructured materials prov