5 results about "Sodium Molybdate Dihydrate" patented technology

This invention discloses a low-temperature, rapid sintering method for preparing sodium molybdenum ceramic targets. Specifically, molybdenum trioxide powder and sodium molybdate dihydrate powder are first mixed using alcohol as a medium through ball milling to obtain a sodium molybdenum slurry. The slurry is then dried, filtered, ground, and sieved to obtain sodium molybdenum powder. The sodium molybdenum powder is then wetted with ammonium molybdate solution. The wetted sodium molybdenum powder is placed in a graphite mold for pre-pressing. The pre-pressed green body is then placed in a sintering furnace along with the graphite mold and subjected to spark plasma-assisted cold sintering at 200℃~400℃ and 50 MPa high pressure to obtain a sintered target body. The sintered body is then mechanically polished and ultrasonically vibrated to obtain a semi-finished target. The semi-finished target and a copper backing plate are brazed together, and after cleaning, drying, and vacuum sealing, the sodium molybdenum ceramic target is obtained. This invention enables the rapid (5 min) sintering of high-purity, high-density sodium molybdenum ceramic targets at low temperatures.

This invention relates to a method for preparing flower-like MoS2 materials and their application in NO2 detection. The method uses sodium molybdate dihydrate, thiourea, and anhydrous citric acid as raw materials, and ethanol and deionized water mixed in a specific ratio as solvents. For the first time, a vacuum-sealed calcination technique is used to successfully prepare a flower-like MoS2 material by precisely controlling the calcination temperature, which will be applied to the gas sensing field. Thanks to the strictly oxygen-free and sealed reaction environment created by the vacuum-sealed technique, this method effectively suppresses oxidation side reactions during material preparation, ensuring high crystallinity of the product. Simultaneously, the three-dimensional flower-like structure provides a larger specific surface area and abundant active sites. This unique structural and environmental advantage provides a solid material foundation for the application of MoS2 in NO2 gas sensing and demonstrates good application potential.

The present application relates to the field of metal material forging and heat treatment process, disclose a kind of based on tug 90kN level high-performance bitt's forging method, including preparation by industrial deionized water, film-forming main agent A, film-forming auxiliary agent B, sodium molybdate dihydrate, polyethylene glycol 400 and triethanolamine are quenched medium and heated constant temperature;After alloy structural steel blank is heated to heat, multiple-pass forging is carried out to obtain forgings;The forgings are pre-cooled to the first temperature, immersed in the quenching medium for first stage cooling, and the flow rate is controlled to maintain the first circulation flow rate;When the surface temperature of the forgings decreases to the second temperature, switch and maintain the second circulation flow rate for second stage cooling;When the core temperature of the forgings decreases to the water temperature, the forgings are lifted out and naturally cooled in still air, and the residual sensible heat is used to complete the self-tempering of the residual heat.The present application balances the cooling rate, avoids surface microcracks and improves the core hardenability.

The application discloses a preparation method of a molybdenum disulfide / modified carboxymethyl cellulose hydrogel bead adsorbent for tetracycline hydrochloride, and relates to the technical field of functional materials and the field of environment; the method comprises the following steps: step 1, a sodium molybdate aqueous solution is prepared by using sodium molybdate dihydrate, thiourea and metal chlorides are added into the sodium molybdate aqueous solution, the mixed solution is completely reacted at 100-180 DEG C, the product is cooled to room temperature, black precipitates are collected by centrifugation, and the black precipitates are washed and dried to obtain fine powder of sulfided metal-doped molybdenum disulfide, step 2, a carboxymethyl cellulose solution with a mass concentration of 0.4-3% is prepared, 10-50% of tannic acid by mass of the carboxymethyl cellulose is added into the carboxymethyl cellulose solution and stirred at 50-90 DEG C to obtain a tannic acid-modified carboxymethyl cellulose mixed solution, and step 3, the sulfided metal-doped molybdenum disulfide powder is added into the tannic acid-modified carboxymethyl cellulose mixed solution and stirred at 50-90 DEG C to obtain a composite slurry, and the composite slurry is extruded into an ionic bath containing metal chlorides by using an ionic crosslinking method to prepare the molybdenum disulfide / modified carboxymethyl cellulose hydrogel bead adsorbent.

The application relates to the field of environmental engineering and discloses an iron oxide-molybdenum disulfide heterojunction catalyst as well as a preparation method and application thereof. Sodium molybdate dihydrate and cysteine are dissolved in water, ultrasonic dispersion is carried out, ball milling treatment is carried out, a sulfur-containing molybdenum-based precursor is obtained through a first hydrothermal reaction, iron salt is added to carry out a second hydrothermal reaction, and the catalyst is obtained through washing and drying. The catalyst is easy to disperse in water, has a large specific surface area, is high in iron element content and uniform in iron element distribution, can form a large number of Fe-S-Mo synergistic active centers, can efficiently activate persulfate in a pH range of 2-10, and can remove chlorobenzoic acid by about 100% in 5 minutes under the condition of an initial concentration of 10 mg / L and near-neutral pH. The catalyst has rapid and efficient degradation performance on antibiotic organic pollutants, the preparation process does not need toxic and harmful organic solvents, the catalyst has stable structure and is environment-friendly, and is suitable for engineering scale-up application.