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Method for preparing vanadium dioxide powder through hydrothermal auxiliary homogeneous precipitation method

A uniform precipitation method, vanadium dioxide technology, applied in vanadium oxide, nanotechnology and other directions, to achieve the effects of simple and controllable operation, sufficient reaction, and easy control of particle size

Inactive Publication Date: 2014-06-25
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are difficult to obtain monodisperse, high-purity nanopowders with high yield.

Method used

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  • Method for preparing vanadium dioxide powder through hydrothermal auxiliary homogeneous precipitation method
  • Method for preparing vanadium dioxide powder through hydrothermal auxiliary homogeneous precipitation method
  • Method for preparing vanadium dioxide powder through hydrothermal auxiliary homogeneous precipitation method

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preparation example Construction

[0039] The invention provides a preparation method of vanadium dioxide powder, comprising the following steps: preparing an aqueous solution of tetravalent vanadium ions; adding a uniform precipitant of specified quality into the obtained aqueous solution, stirring until uniform; and then transferring the obtained mixed solution to Put it into a hydrothermal kettle, heat it up, keep it warm, and synthesize it through hydrothermal reaction; the product after natural cooling is centrifuged, washed, and dried to obtain vanadium dioxide powder. More specifically, as an example, the method of the present invention may include the following steps.

[0040] (1) Prepare an aqueous solution containing tetravalent vanadium ions

[0041] The preparation of the aqueous solution containing tetravalent vanadium ions can be prepared by a method commonly used in this field: dissolving the tetravalent soluble vanadium raw material in an appropriate amount of water, preferably deionized water, ...

Embodiment 1

[0058] Prepare 0.4mol / L VOSO 4 50ml of aqueous solution, add 2.5g of urea and magnetically stir at room temperature until a uniform blue solution is obtained, then put the mixed solution into a 100ml hydrothermal kettle, conduct a hydrothermal reaction at 180°C for 24 hours, cool naturally to room temperature, and centrifuge and dry to obtain Powder, the product is a flake structure, and its main crystal phase is B phase.

Embodiment 2

[0060] Prepare 0.4mol / L VOSO 4 50ml of aqueous solution, add 2.5g of urea and magnetically stir at room temperature until a uniform blue solution is obtained, then put the mixed solution into a 100ml hydrothermal kettle, conduct a hydrothermal reaction at 220°C for 24 hours, cool naturally to room temperature, and centrifugally dry to obtain Powder, the product is a mixture of flakes and granules, and its main crystal phases are phase A and phase B.

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Abstract

The invention relates to a method for preparing vanadium dioxide powder through a hydrothermal auxiliary homogeneous precipitation method. The method disclosed by the invention comprises the following steps of (1), adding a homogeneous precipitation agent into aqueous solution containing tetravalent vanadium ion, and uniformly stirring to form mixed solution; and (2), transferring the obtained mixed solution into a hydrothermal kettle, preserving heat at 200-350 DEG C for 1-120 h, carrying out hydrothermal reaction, cooling, centrifuging, washing, and drying, thereby obtaining vanadium dioxide powder, wherein the homogeneous precipitation agent is a substance capable of being slowly hydrolysed to generate precipitation ion in hydrothermal reaction in the step (2), the precipitation ion is hydroxyl ion, and the mol ratio of tetravalent vanadium ion to the homogeneous precipitation agent is 1:5 to 2:1. By means of the homogeneous precipitation agent, on the one hand, the yield can be increased, and on the other hand, the phenomenon of being non-uniform in local concentration of solution caused by using direct precipitators (such as ammonium hydroxide and sodium hydroxide solution) is avoided, and therefore, monodispersed high-purity nano powder can be obtained.

Description

technical field [0001] The invention relates to the preparation of vanadium dioxide powder in the field of chemical industry, in particular to the preparation of vanadium dioxide powder by hydrothermal treatment technology and uniform precipitation technology, and belongs to the field of energy-saving and environment-friendly new materials. Background technique [0002] Due to the increasing depletion of global resources, energy conservation and emission reduction has become the current top priority for all countries. According to a report published by the United Nations Environment Program on December 11, 2009, 1 / 3 of global greenhouse gas emissions are related to building energy consumption. my country is a country with a large energy consumption. The annual energy consumption is equivalent to 1.5 billion tons of standard coal, of which about 30% is energy consumption in buildings, and the most serious energy consumption in buildings is energy loss through glass. The wind...

Claims

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Application Information

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IPC IPC(8): C01G31/02B82Y40/00
Inventor 纪士东李文静金平实
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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