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Preparation principle and preparation method of molybdenum disulfide

wallpapers Tech 2021-03-31
Preparation principle of molybdenum disulfide
Molybdenite concentrate can be prepared with hydrochloric acid and hydrofluoric acid under direct steam heating, repeated agitation, washing with hot water, centrifugation, drying, and crushing. Pass hydrogen sulfide gas into the ammonium molybdate solution to generate ammonium thiomolybdate. Add hydrochloric acid to convert into molybdenum trisulfide precipitation, then centrifuge, wash, dry, and pulverize. Finally, heating to 950 °C for desulfurization can produce molybdenum disulfide.
Preparation method of molybdenum disulfide
Natural preparation
Molybdenum disulfide has excellent properties and broad application prospects, so a lot of research has been done on the preparation and application of nano-MoS2 at home and abroad.
MoS2 can be prepared by the natural method, namely, the molybdenite concentrate purification method, which is to remove the acid-insoluble matter, SiO2, Fe, Cu, Impurities such as Ca and Pb are further refined to obtain nano-MoS2. The American Climax Molybdenum Company has adopted this method to produce MoS2. The nano-MoS2 made by this method can maintain the natural MoS2 crystal shape, has good lubricating performance, and is suitable for making lubricants. However, the purity of the nano-MoS2 produced by the natural method is not high, and the purification technology needs to be further improved. When the temperature is lower than 400 ℃, it is recommended to use the lower cost MoS2 when working in the ordinary atmosphere. It has a lubricating ability below 1300 ℃, and it is recommended to use the lower cost MoS2.
 
Chemical synthesis
The synthetic method can produce sulfides with high purity, fewer impurities, and fine particle size, and can prepare sulfides that meet different functional requirements. Therefore, the production of nano sulfides by synthetic methods has always attracted much attention. There are many methods for preparing nano-MoS2, such as ammonium tetrathiomolybdate thermal decomposition method, hydrogen sulfide or sulfur vapor reduction method, high-energy ball milling method, carbon nanotube space confinement method, hydrothermal synthesis method, high-energy physical method, and chemical method combination, and so on. Generally speaking, there are two preparation methods. You can directly reach a tungsten source or a molybdenum source with a sulfur source to obtain nano-MoS2, or first react a tungsten source or a molybdenum source with a sulfur source to obtain a precursor, and then pass the precursor through an appropriate Method to decompose or reduce to MoS2.

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