Tungsten Oxide

Bismuth tungstate is a new type of photocatalyst which has attracted much attention in recent years. It has not only good catalytic performance, stable photocatalytic activity, but also non-toxic environment. It is becoming a new hot spot in the field of photocatalyst. The liquid phase methods for preparing bismuth tungstate include solvothermal method, precipitation method, microemulsion method, hydrothermal method, etc.. Among the many methods, hydrothermal method has become the most popular method because of its simple operation process, high utilization ratio of raw materials, less energy consumption, and conforms to the policy of energy saving and emission reduction. The working principle of the hydrothermal method is in a closed reaction vessel special (autoclave), using aqueous solution as reaction medium, heating the reaction vessel, creating a high temperature and high pressure reaction environment, the insoluble substances dissolved in normal temperature and ...

Bismuth tungstate is a new photocatalyst developed in recent years. It has the characteristics of narrow band gap, good catalytic performance, stable photocatalytic and environmental protection, and has become a new hot spot in the field of photocatalyst. The preparation methods of bismuth tungstate mainly include solid phase method and liquid phase method. In general, they are fire process and wet process. Solid phase method is the preparation of bismuth tungstate by sintering at high temperature, compared with the liquid phase method, the solid phase method is more adopted by enterprises. Because most of the smelting enterprises adopt solid phase method to obtain tungsten powder, calcination equipment can be used in conjunction with each other, and the equipment foundation is the reason why solid phase method is more popular. The synthesis principle of bismuth tungstate solid phase method is mechanical processing containing Bi and W elements in the oxide material or its...

Dye pollution is one of the most important environmental pollution sources in the world. Dye wastewater has the characteristics of complex composition, high chromaticity, large amount of emission, toxicity and biochemical degradation. It has been a difficult problem in wastewater treatment. In recent years, with the development of photocatalytic technology, more and more photocatalysts have been developed. Bismuth tungstate has been widely used for its excellent photocatalytic degradation ability, there is no doubt that bismuth tungstate has better degradation effect on dye wastewater. However, in recent years, it has been found that bismuth tungstate is good, but it is easy to assemble, difficult to separate and difficult to recover. In order to solve this problem, some scholars have proposed a scheme for making composite materials of bismuth tungstate and acrylic fiber. Acrylic fiber is also called polyacrylonitrile fiber, also known as synthetic wool, and bismuth tungst...

In the process of tungsten ore flotation, under the action of flotation reagent, bubbles appear on the surface of flotation machine, the target ore particles begin to float, and gradually enriched and adsorbed in the bubbles. People get the needed ore particles by collecting and processing the bubbles, in this process, how does the flotation bubble adsorb ore particles? Generally speaking, tungsten ore particles and bubbles are close to each other, the water between the cracks should be removed first, because the water molecules are disordered freely, so it is easy to be removed, when the bubbles and the ore particles are further approaching, the hydration film on the ore surface is thinned by the extrusion of the bubbles, the process of sticking ore particles to bubbles can be divided into three stages. The first stage is the approaching and contacting stage of the ore particles. In the process of flotation, due to the mechanical and aerating effects of flotation, the...

A thin film material is a film material with a thickness less than 1 microns. It is mainly used for semiconductor functional devices and optical coatings. At present, the field has been involved in computer storage equipment, pharmaceuticals, high temperature insulation products, thin-film batteries, solar cells etc.. Compared with traditional block materials, thin film materials have incomparable advantages, such as small grains, large specific surface area and special surface structure. Therefore, zirconium tungstate is a kind of excellent negative thermal expansion material. The thin films prepared with zirconium tungstate can be conveniently used in the compensation layer of thermal stable structures or into large capacity heat driven devices, This is also the other general material is difficult to take advantage of it, so these years the zirconium tungstate thin film or zirconium tungstate composite thin film has also been concerned and research hot spots.  It is ...

China is a major producer of antibiotics and one of the most serious countries that abuse antibiotics. Livestock farming is the hardest hit by the use of antibiotics, with the rapid development of aquaculture, the residues of antibiotics in water, sediment and soil become more and more serious. Tetracycline is the most common antibiotic used in livestock farming. Its main characteristics are broad-spectrum antibacterial and cheap, unlike other organic wastewater contamination, tetracycline and other antibiotic compounds usually have a shorter degradation half-life in the environment, however, the use of tetracyclines in livestock and aquaculture has never ceased to allow them to enter the environment, manifested as "persistent". Such a consequence is that antibiotics selectively inhibit some environmental microorganisms in the environment and induce the emergence of some antibiotic resistance groups, thus triggering a particular ecotoxicological effect, this is why s...

Bismuth tungstate (Bi 2 WO 6 ) is an oxide with perovskite like structure, and is a typical n type semiconductor. Bismuth tungstate has become a new hot spot of photocatalysis because of its unique crystal structure. The preparation methods of bismuth tungstate include solvothermal method, precipitation method, microemulsion method, hydrothermal method, etc.. Among them, microemulsion method is a new method for preparing ultrafine powders, which can be used to prepare nanometer bismuth tungstate, which is relatively simple and the powder morphology is easy to control. Microemulsion refers to two mutually insoluble reaction solutions which form isotropic and thermodynamically stable emulsions under the influence of surfactants, the reactants are nucleated, agglomerated, agglomerated, crystallized and grown in tiny vacuoles and then treated at high temperatures (usually less than 240 degrees) to form nanoparticles. Microemulsion can be divided into three types: water-in-oil...