In the 21st century, the level of industrialization has developed rapidly, but the natural environment and ecology on which human beings depend for it have been severely damaged. There are a lot of toxic and harmful gases, smog, acid rain, PM2.5, etc. in the air. Investigating NO_x^-based toxic gases, the market demands sensors that efficiently and accurately detect and prevent toxic and harmful gases.

With the development of society, the requirement for materials is higher and higher. In some application fields, materials are required not only to have flexibility and strength, but also to have certain hardness and wear resistance, such as cutting tools in mechanical processing, drills for deep energy exploration, dies used in mechanical manufacturing and cylinder block of engine, etc.. For this reason, people try to use surface modification technology and surface coating technology to not only maintain the high strength and toughness of the material matrix, but also give play to the advantages of super-hard, super-strong and wear-resistant surface coating, thus greatly improving the durability and adaptability of the material.

Tungsten containing mesoporous materials have nano-scale homogeneous pore structure and huge surface area. They are a good catalyst carrier. By introducing active components into mesoporous materials, they can provide the active sites needed for catalytic reaction. They have shape-selective catalytic properties and are typical micro-reactor.

Ammonium dithiotungstate (NH₄) ₂WO₂S₂ is an important thiometallic ammonium salt. After thermal decomposition, transition metal chalcogenide tungsten disulfide WS₂ can be obtained. It can be used in the synthesis of tungsten iron sulfur cluster compounds, semiconductors, superconductors, photoelectrochemical solar cells, hydrogen storage materials and electrode materials. It has good application and is the precursor of coal liquefaction and heavy oil hydrogenation catalysts. It can also be used as raw materials for the preparation of supported and non-supported tungsten sulfide hydrogenation catalysts. Therefore, it is of great significance to develop a high yield method for the preparation of high purity ammonium dithiotungstate.