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A kind of nano zinc oxide and preparation method thereof

A nano-zinc oxide and zinc source technology, applied in the field of nano-materials, can solve the problems of large nano-particle size, easy aggregation of nano-particles, and small specific surface area, and achieve good dispersion, uniform supersaturation, and improved mixing performance. Effect

Active Publication Date: 2018-01-12
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the traditional direct precipitation method has the characteristics of poor mixing performance, which leads to a large amount of reactants being consumed in the growth of particles during the synthesis process, and the synthesized nanoparticles are easy to agglomerate, which makes the synthesized nanoparticles have large particle size and relatively large particle size. small surface area etc.

Method used

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  • A kind of nano zinc oxide and preparation method thereof
  • A kind of nano zinc oxide and preparation method thereof
  • A kind of nano zinc oxide and preparation method thereof

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preparation example Construction

[0029] The invention provides a kind of preparation method of nanometer zinc oxide, comprises the following steps:

[0030] (1) Mix and atomize the zinc source solution and the compressed gas to obtain the gas-carrying zinc source droplets;

[0031] (2) Mixing and atomizing the carbonate precipitating agent solution with compressed gas to obtain gas-carrying precipitating agent droplets;

[0032] (3) spraying and mixing the gas-carrying zinc source droplets obtained in the step (1) with the gas-carrying precipitant droplets obtained in the step (2), and obtaining a precursor by precipitation reaction;

[0033] (4) roasting the precursor that described step (3) obtains, obtains nano zinc oxide;

[0034] The steps (1) and (2) are in no chronological order.

[0035] The invention mixes and atomizes the zinc source solution and the compressed gas to obtain the gas-carrying zinc source droplet. In the present invention, the zinc source is preferably a soluble zinc salt, more pre...

Embodiment 1

[0050] Using zinc sulfate heptahydrate solution with a concentration of 0.8mol / L and ammonium bicarbonate solution with a concentration of 1.6mol / L as the reactant solution, the compressed gas of 0.4MPa quickly passes through the nozzle, forming a pressure difference at both ends of the nozzle, and the reactant Brought into the mixing chamber of the nozzle respectively, in the mixing chamber, the gas quickly cuts the reactant and atomizes the reactant into liquid droplets;

[0051] The atomized reactants are taken out of the nozzle by the airflow, and outside the nozzle, two airflows with a gas-liquid ratio of 800 are sprayed at a rate of 60L / min, and collision and direct precipitation reaction occur to produce precursor particles;

[0052] Precursor particles are brought into the three-necked flask adapter by the airflow, and mechanically stirred and aged at a speed of 70r / min for 1h;

[0053] Suction filtration, the obtained solid was washed three times with deionized water ...

Embodiment 2

[0057] Using zinc sulfate heptahydrate solution with a concentration of 0.6mol / L and ammonium bicarbonate solution with a concentration of 1.2mol / L as the reactant solution, the compressed gas of 0.4MPa quickly passes through the nozzle, forming a pressure difference at both ends of the nozzle, and the reactant Brought into the mixing chamber of the nozzle respectively, in the mixing chamber, the gas quickly cuts the reactant and atomizes the reactant into liquid droplets;

[0058] The atomized reactants are taken out of the nozzle by the airflow, and outside the nozzle, two airflows with a gas-liquid ratio of 1000 are sprayed at a rate of 70L / min, and the precursor particles are produced by collision and direct precipitation reaction;

[0059] Precursor particles are brought into the three-necked flask adapter by the airflow, and mechanically stirred and aged at a speed of 70r / min for 1h;

[0060] Suction filtration, the obtained solid was washed three times with deionized wa...

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Abstract

The invention provides a nanometer zinc oxide and a preparation method thereof. According to the invention, a direct precipitation method based on continuous air impinging stream is adopted for utilizing the compressed air to quickly cut a zinc source solution and a carbonate precipitator solution respectively, the reactant solution is atomized into liquid drops, and the air flow carrying reactants is jetted and mixed so as to impinge, so that the quick and sufficient mixing of the reaction system is promoted, the mixing property of the system is increased, and the super-saturation of the reaction system is uniform. Meanwhile, precursor particles are compounded under an air atmosphere, so that the agglomeration function among the precursor particles in the compounding process can be greatly reduced. An experimental result proves that the mixing property and dispersity of the reaction system can be promoted according to the preparation method for the nanometer zinc oxide; the grain size of the prepared nanometer zinc oxide is 7-20nm; and the specific surface area can reach up to 88.89m<2> / g.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a nanometer zinc oxide and a preparation method thereof. Background technique [0002] Nano-zinc oxide (ZnO) is a new type of functional inorganic material, especially its anti-ultraviolet radiation and its catalytic degradation of organic matter in the ultraviolet region, making it of great importance in many fields such as electronics, optics, biology, and medicine. application. Zinc oxide nanomaterials have the characteristics of small size, large specific surface area, different bond states on the surface and incomplete particle coordination, and incomplete coordination of surface atoms. These characteristics lead to more active sites on the surface of zinc oxide nanoparticles when they are used as catalysts. The uneven atomic steps increase the contact surface. Therefore, the catalytic activity and selectivity of zinc oxide nano-catalysts are far greater than t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/02B82Y30/00
CPCC01G9/02C01P2004/03C01P2004/04C01P2004/64
Inventor 王玉军蔡卫滨王明慧郭兴明周才金
Owner TSINGHUA UNIV
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