Nano bismuth trioxide Bi2O3 is an important functional material, which mainly exists in four crystal forms: α, β, γ and δ. Different crystal forms have different applications. The application of bismuth oxide is very wide. It is not only a good organic synthesis catalyst, ceramic coloring agent, plastic flame retardant, medicinal astringent, glass additives, high refractive glass and nuclear engineering glass manufacturing and nuclear reactor fuel, but also the electronics industry In an important doped powder material.

1. Electronic functional material
As a kind of electronic functional powder doping material, bismuth oxide powder is widely used in the production of electronic components such as sensitive components and dielectric ceramics. It has the characteristics of high quality requirements, small quantity and wide coverage. Under normal conditions, the monoclinic structure of alpha Bi2O3 is the most stable, and its crystal structure contains a large number of oxygen vacancies, and the oxygen ion conductivity is good, which can be used to make various solid oxide fuel cells and oxygen sensors. Bismuth oxide is also an active material often used in chemical power sources, such as an excellent corrosion inhibitor for mercury-free zinc batteries, electrode materials for lithium batteries, and additives to improve the rechargeability of alkaline Zn/MnO2 batteries. Research has found that nano-scale bismuth oxide has better rechargeability than conventional bismuth oxide powder, and as an additive to the positive electrode active material EMD of primary batteries, it shows excellent performance under deep discharge.

2. combustion catalyst
Lead oxide is an important burning rate catalyst in the double-base solid propellant. It can increase the burning rate of the propellant and reduce the pressure index, but lead is more toxic and has direct or potential harm to people or the environment. Bismuth is a kind of A low-toxicity, low-smoke, and extremely safe burning rate catalyst for the ecology. Experiments have shown that nano Bi2O3 improves the burning rate of propellants in the low-pressure section better than nano-PbO, and has the effect of reducing the propellant pressure index. Therefore, nano-bismuth oxide has a bright future to replace nano-lead oxide.

3. Photocatalytic degradation of materials
It has been reported that Bi2O3 photocatalytic treatment of nitrite-containing wastewater has been reported. The results show that Bi2O3 has good photocatalytic activity. Due to the large specific surface area, many surface active points, and high photocatalytic activity, nanomaterials exhibit more excellent photocatalytic properties.

4. According to literature reports, bismuth oxide nanoparticles coated with sodium dodecylbenzene sulfonate on their surface have a large trivalent nonlinear optical coefficient, and a large nonlinear coefficient even under the action of weak light. The characteristics are of great significance to the development of nonlinear optical devices.

5. Polyurethane-heparin graft copolymer is a medical material with antithrombotic function. It can be used to prepare interventional catheters. The thin wall of the catheter must be filled with X-ray-opaque nano-bismuth oxide ultrafine powder.

6. Radiation protection materials.

The current anti-radiation materials are generally lead-containing products, and lead is harmful to the human body and the environment. Bismuth is a kind of "green metal", and the radiation attenuation coefficient of bismuth is larger than that of lead. If the strong anti-radiation performance of nano-bismuth oxide and the quantum effect of nano-materials are combined, this is important for the development of high-performance anti-radiation Materials are undoubtedly a new way.

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