Preparation method of flower-like MoO2 (Molybdenum dioxide) nano material

A nano-material and flower-shaped technology, which is applied in the field of preparation of flower-shaped MoO2 nano-materials, can solve the problems of low production efficiency, inapplicability, and high consumption of isopropanol, and achieve low production costs, high product yields, and process pollution. small effect

Inactive Publication Date: 2019-08-30
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

More isopropanol is consumed in the preparation process, and the production efficiency is low
And the point is, this prior art is molybdenum trioxide MoO with oxygen deficiency 3-x , the properties and uses of this molybdenum oxide are similar to those of flower-like MoO 2 different, this prior art is not suitable for the preparation of MoO 2

Method used

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  • Preparation method of flower-like MoO2 (Molybdenum dioxide) nano material
  • Preparation method of flower-like MoO2 (Molybdenum dioxide) nano material
  • Preparation method of flower-like MoO2 (Molybdenum dioxide) nano material

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preparation example Construction

[0036] The invention relates to a flower-shaped MoO 2 A method for preparing nanomaterials, comprising:

[0037] S1: Add citric acid to the suspension of molybdenum acetylacetonate, and completely dissolve the molybdenum acetylacetonate by at least one mode of ultrasonic dispersion, stirring or shaking to obtain a reaction system;

[0038] S2: the reaction system is placed in a high-pressure reactor for hydrothermal reaction to obtain a black-gray precipitate;

[0039] S3: Collect the precipitate.

[0040]Preferably, in S1, the suspension of molybdenum acetylacetonate is obtained by dispersing molybdenum acetylacetonate in deionized water, and the concentration of the suspension of molybdenum acetylacetonate is 0.1-0.5mmol / L; for example, the concentration is 0.10mmol / L , 0.25mmol / L, 0.5mmol / L.

[0041] As a preferred embodiment of the present invention, in S1, the amount of citric acid added is such that the mass ratio of molybdenum acetylacetonate is 5-15:1. Preferably 7...

Embodiment 1

[0048] combine figure 1 As shown, this embodiment provides a flower-like MoO 2 A method for preparing a nanomaterial, comprising the steps of:

[0049] (1) Weigh molybdenum acetylacetonate particles and dissolve them in ultrapure water to prepare 15 mL of molybdenum acetylacetonate suspension with a concentration of 0.1 mmol / L, which is recorded as A.

[0050] (2) Add 0.5 g of citric acid particles to A, ultrasonically disperse, and magnetically stir for 2 hours until the molybdenum acetylacetonate particles are completely dissolved.

[0051] (3) Put the above solution into an autoclave and heat it at 160° C. for 10 hours to obtain a black-gray precipitate.

[0052] (4) Centrifuge the product mixture at 4000 rpm for 10 min in a centrifuge, remove the supernatant, and collect the precipitate.

[0053] (5) Use deionized water and ethanol to disperse and wash the precipitate twice respectively, centrifuge the product, and finally put it in a drying oven at 60°C for 3 hours to ...

Embodiment 2

[0060] This embodiment provides a flower-like MoO 2 The preparation method of the nanomaterial is the same as that of Example 1, except that the hydrothermal reaction temperature is increased by 180° C., and the reaction is carried out for 8 hours. The experimental results are almost the same as in Example 1, and the flower-shaped MoO with a diameter of 100-200nm is obtained. 2 nanoparticles.

[0061] This shows that the effect of the hydrothermal reaction time on the product is not obvious within 8-12 hours.

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Abstract

The invention relates to the technical field of metal oxide catalytic materials, in particular to a preparation method of a flower-like MoO2 (Molybdenum dioxide) nano material. The method comprises the following steps: S1, adding citric acid to suspension of molybdenyl acetylacetonate, and completely dissolving the molybdenyl acetylacetonate by at least one way of ultrasonic dispersion, stirring or oscillation to obtain a reaction system; S2, placing the reaction system in a high-pressure reaction kettle for a hydrothermal reaction to obtain black gray precipitates; S3, collecting the precipitates. According to the method provided by the invention, flower-like MoO2 nanoparticles with the particle diameter of 100 to 200 nm can be obtained; the microscopic morphology of the flower-like MoO2nanoparticles is a spherical surface with flake-like branches / fins; the flower-like MoO2 nanoparticles show photocatalytic activity and organic matter degradation ability far superior to existing spherical MoO2 nanoparticles.

Description

technical field [0001] The invention relates to the technical field of metal oxide catalytic materials, especially a flower-like MoO 2 Preparation methods of nanomaterials. Background technique [0002] Molybdenum dioxide (MoO 2 ) among transition metal oxides has become an attractive material due to its low resistivity, high chemical stability, and high melting point. MoO 2 The higher free electron density in the valence electron band will make it have good catalytic performance. Therefore, MoO 2 It is possible to become a widely used catalytic material. [0003] with bulk MoO 2 Materials compared to MoO with a unique nanostructure 2 The material has shorter electron and ion diffusion paths, larger active surface area, and more favorable reaction kinetic conditions, thus exhibiting better physical and chemical properties. In order to obtain materials with different properties, people have studied nano-MoO with unique morphology 2 The preparation has been extensivel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/02B01J23/28B82Y40/00
CPCB01J23/28B01J35/004B82Y40/00C01G39/02C01P2004/45C01P2004/62C01P2006/12C01P2006/90
Inventor 付海涛吴镇湘杨晓红安希忠盛惠朋赵晨王岩何鹏
Owner NORTHEASTERN UNIV
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