Tungsten Oxide

Cesium tungstate is a new type of heat insulation material. At present, some famous coating companies in Japan, Germany and the United States all develop the transparent coating of cesium tungstate, which has a great market prospect. The thermal insulation properties of cesium tungstate reflect its near infrared absorption properties, the results show that cesium tungstate not only has a strong absorption property in the near infrared region (800~1100 nm), at the same time, the visible light region (wavelength 380~780 nm) has a strong transmittance, and has a strong shielding property in the ultraviolet region (200~380 nm). Compared with similar chemicals, cesium tungstate has the best absorption performance. Therefore, it is used to make insulation glass, heat insulation automobile film and heat insulation coating. Similar to other tungstate product, method of preparation of nanometer cesium tungstate with chemical vapor transport method, thermal plasma method, solid...

Biodiesel refers to oil crops, oil plants and algae and other aquatic plants oil and animal fats, waste food oil as raw oil by transesterification process made of methyl or ethyl ester of fuel. It is environmentally friendly and clean energy. Swida wilsoniana fruit oil as raw material and diesel combustion performance similar to bio diesel, is a safe, clean biomass fuel oil.  Method for producing bio diesel are generally homogeneous alkaline and acid catalysis method, homogeneous acid process can produce a large amount of acidic waste water, no environmental significance, homogeneous alkaline law is prone to saponification reaction, which leads to difficult separation of bio diesel products. So, in addition to the above two methods, is there a better solution? After repeated attempts, Li Nian, a scholar at the Central South University, found that cesium phosphotungstic could be a catalyst for this problem and has done a test for it. Cesium phosphotungstic is one of tu...

Levulinic acid, also known as fructose, is the basic raw material for the synthesis of various light chemical products, and has high activity. High value-added products can be produced by chemical reactions such as esterification, halogenation, hydrogenation, oxidative dehydrogenation and condensation. They are widely used in organic synthesis, industry, agriculture and pharmaceutical industry. Although levulinic acid is good, the preparation method is relatively troublesome. There are many problems in the preparation of traditional acid process, such as corrosion of equipment, serious pollution, complex treatment process and difficult separation of products. To solve these problems, scientists are trying to find the appropriate solid acid catalyst to replace the traditional acid catalyst. However, a variety of solid acid catalysts have been tried with little success until the appearance of phosphotungstic acid . Phosphotungstic acid is a kind of heteropoly acid. Becau...

Tungstate phosphor is a typical self activated luminescent material. Without the addition of other activated ions, they can produce high efficiency luminescence under the excitation of UV, X ray and CR. Tungstate matrix has the characteristics of stable luminescence spectrum, wide spectrum of luminescence spectrum and large area of visible light. The higher the purity, the greater the brightness of the luminescence, then, why does tungstate glow? The reason why tungstate will emit light, its roots from tungstate chromium ions, tungstate generally have wolframite structure and scheelite structure, among them, among them, tungstate crystal scheelite structure with a higher density, high-energy particles and high-energy radiation has a high ability to stop, is a good scintillator or X-ray emitter. At low temperature (liquid nitrogen or helium temperature) by ultraviolet short wavelength excitation, will emit green or blue light, it is the main material for the manufacture of...

In recent years, in order to save fresh water resources and reduce the cost, some of the coastal chemical, metallurgy, electric power and petrochemical enterprises began to use seawater as a type of industrial circulating cooling water. Although this practice has many advantages, in the sea cl -  content is high, easy to produce metal corrosion, metal corrosion is one of the most important destructive factors, which can cause corrosion and perforation of equipment and pipes, cause serious corrosion, and cause enormous economic losses and social harm. In order to reduce the probability of metal corrosion, it is a simple and effective anti-corrosion method to add inhibitors to circulating cooling water. Only common chromate, nitrite, phosphate and other corrosive agents are toxic preparations, excessive use is tantamount to quenching thirst with poison, research and development of low toxicity, non-toxic and effective corrosion inhibitors have a greater significance. ...

Sodium tungstate is an inorganic inhibitor. It has many advantages, such as low toxicity, no harm to environment, human body and crops, and no microorganism breeding. However, sodium tungstate has its unavoidable defects. First of all, the effect of single sodium tungstate is limited, and it needs to be used to enhance the effect, at the same time, sodium tungstate is more expensive and impractical to use. Therefore, more enterprises are using sodium tungstate and cheaper chemicals to make sodium tungstate composite corrosion inhibitor to realize the function of protecting metal. Polyaspartic acid (PASP) is a newly found environmental friendly water treatment agent. It has excellent scale inhibition, dispersion and good biodegradability, after polyaspartic acid used efficiently, stably microorganisms, fungi degradation of the final product harmless to the environment, is a very desirable water treating agent. What is the effect of combining sodium tungstate with pol...

Methylene blue is an aromatic heterocyclic compound, used as a chemical indicator, dye, biological dye and drug use, mostly dyes, the methylene blue aqueous solution is blue in an oxidizing environment. In industrial applications, methylene blue also produces wastewater which is difficult to degrade. The methylene blue wastewater discharged into rivers, lakes and seas is also a toxic substance. Then, how to degrade methylene blue wastewater? In theory, the key and core of difficult wastewater treatment technology is the removal of refractory and insoluble matter in wastewater, that is, how to convert non biodegradable soluble chemicals into biochemical substances. In recent years, with the development of photocatalytic technology, more and more photocatalysts have been developed. Sodium tungstate is one of the most widely used photocatalysts, so is sodium tungstate also suitable for the degradation of methylene blue wastewater? Sodium tungstate is an excellent phot...

Nannochloropsis oculata belongs to the category of the true focus algae class, is considered to be an ideal raw material for most potential, to achieve sustainable supply of biodiesel refining. At present there are about 6 species have been set, namely Cadiz Nannochloropsis oculata, particles of Nannochloropsis oculata and lakes Nannochloropsis oculata, marine Nannochloropsis oculata, focus of Nannochloropsis oculata and saline Nannochloropsis oculata. The research showed that the key of Nannochloropsis oculata oil is the fatty acid composition, which is closely associated with environmental conditions, nitrogen is a large number of elements needed for microalgae growth, and different nitrogen sources and concentrations have significant effects on the composition of microalgae fatty acids. Nitrate nitrogen is the most important form of nitrogen in sea water. As the nitrogen fertilizer used in surface plants, nitrate reductase is an important regulating enzyme and a s...