1. As a catalyst and desulfurizer
Cu is a transition metal. It has a special electronic structure different from other group metals and its electron-loss properties. It can exhibit good catalytic effects on different chemical reactions and is widely used in the field of catalysts. When the scale of CuO particles is as small as nanometer, due to the special multi-surface free electrons and high surface energy of nanomaterials, it can exhibit higher catalytic activity and more peculiar catalytic phenomena than conventional scale CuO. Nano-CuO is an excellent desulfurization product that exhibits excellent activity at room temperature, and the removal accuracy of H2S can reach 0.05 mg·m-3 or less. Preferably, the nano-CuO penetrates the sulfur capacity to 25.3% at a space velocity of 3 000 h-1, which is higher than other desulfurization products of the same type.
2, antibacterial performance of nano CuO
The metal oxide antibacterial process can be simply described as: Under the excitation of light greater than the forbidden band energy, the generated hole-electron pair acts on O2 and H2O in the environment, and generates free radicals such as active oxygen and organic molecules in the cell. A chemical reaction occurs, which in turn decomposes the cells and achieves antibacterial effects . Since CuO is a p-type semiconductor, it has a hole (CuO) + itself, which may act as an antibacterial or antibacterial agent. Studies have shown that nano-CuO has good antibacterial ability against pneumonia, Pseudomonas aeruginosa and the like.
3. Application of nano-CuO in sensors
Sensors can be broadly classified into physical sensors and chemical sensors. The physical sensor is a device that converts physical quantities such as detected light and temperature into electrical signals for physical quantities such as light, sound, magnetism, or temperature. Chemical sensors are devices that turn the type and concentration of a particular chemical into an electrical signal. The chemical sensor is designed mainly by using a sensitive material to directly or indirectly cause a change in an electrical signal such as an electrode potential when a molecule or an ion in a substance to be tested is in contact with each other. Since the external signal can be expressed as an electrical signal, the sensor is widely used in many fields such as environmental monitoring, medical diagnosis, and meteorology.
Nano-CuO has the advantages of high specific surface area, high surface activity, specific physical properties and extreme micro-sensitivity, making it sensitive to external environment such as temperature, light and moisture. Applying it to the sensor field can greatly improve the response of the sensor. Speed, sensitivity and selectivity.
4. Catalysis of thermal decomposition of propellant
The application of ultrafine nanoscale catalysts is one of the important ways to adjust the combustion performance of propellants. In the field of national defense, ammonium perchlorate (AP) is a high-energy component of composite solid propellants, which accounts for 60% to 80% of AP-based propellants. Its properties are critical to the performance of propellants. effect. Nano-copper oxide is an important burning rate catalyst in the field of solid propellants. The needle-shaped copper oxide with an average particle diameter of 30 to 50 I吼 prepared by spray pyrolysis is attached to the surface of the AP crystal to form composite particles, thereby lowering the thermal decomposition temperature of AP, accelerating the decomposition rate, and decomposing the total exotherm.