Method for preparing molybdate nanocrystalline

A technology of molybdate and nanocrystals, which is applied in the field of preparation of molybdate nanostructures, can solve the problems of expensive precursor method, difficult process control, and low yield, and achieve low synthesis process cost, convenient operation, and simple experimental process Effect

Inactive Publication Date: 2009-03-25
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these methods are applied to large-scale production and there will be insoluble problems, such as complex precursor method needs expensive organic solvent, and the cost is higher (F.Rullens; M.Devillers; A.Laschewsky, J.Mater.Chem., 2004 , 14, 3421-3426); although the hydrothermal method can obtain high-quality nanocrystalline grains, the process is not easy

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  • Method for preparing molybdate nanocrystalline
  • Method for preparing molybdate nanocrystalline
  • Method for preparing molybdate nanocrystalline

Examples

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Embodiment 1

[0023] Dissolve 2.47g of ammonium heptamolybdate in 200mL of deionized water, stir to form a transparent solution of 0.01 mol / L; dilute concentrated ammonia water to a concentration of 2 mol / L, take 8.5mL and add dropwise to the ammonium heptamolybdate solution , to obtain a mixed solution of ammonium heptamolybdate and ammonia water; 3.77g of ferric nitrate was dissolved in 100mL of deionized water, and dissolved rapidly after stirring to form a transparent solution of 0.093 mol / liter. Under magnetic stirring at 400-1000 rpm, ferric nitrate solution is added dropwise to the mixed solution of ammonium heptamolybdate and ammonia water, and the solution immediately produces precipitation, which increases continuously as the reaction progresses. Continue to stir for 2 hours after the ferric nitrate solution is completely dripped in. The obtained precipitates are washed and filtered with deionized water and absolute ethanol for 3 times respectively, and then dried at 50°C for 5 hou...

Embodiment 2

[0025] Dissolve 2.47g of ammonium heptamolybdate in 200mL of deionized water, stir to form a transparent solution of 0.01 mol / L; dilute concentrated ammonia water to a concentration of 2 mol / L, take 8.5mL and add dropwise to the ammonium heptamolybdate solution , to obtain a mixed solution of ammonium heptamolybdate and ammonia; 3.26mL mass percent of 50% manganese nitrate solution was diluted to 100mL with deionized water to form a 0.14 mol / liter transparent solution. Add manganese nitrate solution dropwise to the mixed solution of ammonium heptamolybdate and ammonia water under magnetic stirring at 400-1000 rev / min, and precipitates will appear in the solution immediately, and the precipitates will continue to increase as the reaction progresses. Continue to stir for 2 hours after the manganese nitrate solution is completely dripped in. The obtained precipitates are washed and filtered with deionized water and absolute ethanol for 3 times respectively, and then dried at 50°C ...

Embodiment 3

[0027] Dissolve 2.47g of ammonium heptamolybdate in 200mL of deionized water, stir to form a transparent solution of 0.01 mol / L; dilute concentrated ammonia water to a concentration of 2 mol / L, take 8.5mL and add dropwise to the ammonium heptamolybdate solution , to obtain a mixed solution of ammonium heptamolybdate and ammonia water; 4.07g of cobalt nitrate was dissolved in 100mL of deionized water, and dissolved rapidly after stirring to form a transparent solution of 0.14 mol / liter. Under magnetic stirring at a speed of 400-1000 rpm, add cobalt nitrate solution dropwise to the mixed solution of ammonium heptamolybdate and ammonia water, and precipitates will appear in the solution immediately, and the precipitates will continue to increase as the reaction progresses. Continue to stir for 2 hours after the cobalt nitrate solution is completely dropped in, and the obtained precipitates are washed and filtered with deionized water and absolute ethanol for 3 times respectively, ...

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Abstract

The invention provides a method for preparing molybdate nano-crystalline, which is characterized in that: with hexaammonium molybdate and nitrate as raw materials, the method for preparing molybdate nano-crystalline comprises steps as follows: preparing mixed solution of ammonium paramolybdate and ammonia as well as solution of nitrate with a certain concentration; stirring forcibly at the room temperature and dripping the solution of nitrate into the solution of ammonium paramolybdate and ammonia to form precipitate; and filtering, drying and heat treating the precipitate to prepare the molybdate nano-crystalline. The prepared molybdate nano-crystalline is in the different shapes of nanometer grain, nanometer rod, nanometer wire or nanometer sheet. With cheap raw materials and easy operation, the molybdate synthesis method provided by the invention does not need complex instruments or expensive solvent, thus being a method for the quick preparation of the molybdate nano-crystalline. With different nanometer patterns, the prepared molybdate is provided with high degree of crystallinity and purity. The method for preparing molybdate nano-crystalline has the advantages of simple technique, easy control, environmental protection, and safe and reliable operation, and can be used for batch production.

Description

technical field [0001] The invention relates to a method for preparing a molybdate nanostructure. It belongs to the field of nanometer material preparation. Background technique [0002] Molybdates are an important class of inorganic functional materials. Because most of them have excellent luminescence, catalytic properties and semiconductor properties, they are widely used in luminescent materials, catalysts, sensors and other fields. Recent studies have shown that molybdates also have broad application prospects in lithium-ion batteries and microwave piezoelectric materials. Since the purity, particle size and morphology have an important influence on the properties of materials, especially the catalytic and semiconductor properties, it is very important to study and explore methods for preparing high-purity molybdate powders with nanometer size and morphology. Significance. [0003] The conventional method for preparing molybdate is solid phase reaction method. Becau...

Claims

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Application Information

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IPC IPC(8): C01G39/00
Inventor 高濂彭诚
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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