At present, indoor and outdoor environmental pollution has become increasingly prominent. Photocatalytic materials can use sunlight to degrade various gas-phase and liquid-phase pollutants harmful to the environment and mineralize them into harmless water and carbon dioxide. Photocatalytic method is a very economical, convenient and feasible method to purify the environment, and its related research has attracted great attention. However, there are two problems in current photocatalytic materials, one is poor visible light response, the other is low efficiency.

137Cs is the main heat-releasing nuclide in high-level radioactive waste liquor. If it can be separated, the radioactive level of high-level radioactive waste liquor will be greatly reduced, and the cost of subsequent treatment of radioactive waste liquor and solid waste disposal will be reduced. In addition, 137Cs can be used as gamma radiation source in breeding, food irradiation storage, sterilization of medical devices, cancer treatment and various instrumentation fields. Therefore, the separation of 137Cs from high-level radioactive waste liquor has been one of the hotspots in the field of spent fuel reprocessing at home and abroad, and also an important goal in the process of reprocessing.

Tungsten disulfide has good corrosion resistance, good adsorption capacity on metal surface, generally can withstand strong acid corrosion, high temperature resistance and low friction coefficient. Therefore, tungsten disulfide is usually used as a lubricant. Lubrication under various harsh conditions such as high temperature, high pressure, high load, high speed, high radiation, strong corrosion and ultra-low temperature.

SCR denitration technology is a necessary means for power plants to achieve ultra-clean emissions. Catalysts, as a core part of SCR denitration technology, lose their activity due to wear or blockage during operation. Some of the regenerable catalysts can be reused after regeneration, while the catalysts that cannot be regenerated face the situation of rational utilization and disposal.