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Preparation method of nano MoO3 powder for photocatalytic degradation

A photocatalytic and nanotechnology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of difficult control of product morphology, limited production and application, and high demand for equipment, to achieve Excellent photocatalytic performance, good product stability and high purity

Active Publication Date: 2018-11-13
HENAN UNIV OF SCI & TECH
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Problems solved by technology

[0004] At present, in the prior art, for MoO 3 The preparation methods of powder mainly include sol-gel method, hydrothermal synthesis method, atomization method, etc. The above-mentioned methods have defects such as inconvenient operation, easy introduction of impurities, difficult control of product shape, and high equipment requirements, which limit their production and application.

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  • Preparation method of nano MoO3 powder for photocatalytic degradation
  • Preparation method of nano MoO3 powder for photocatalytic degradation
  • Preparation method of nano MoO3 powder for photocatalytic degradation

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preparation example Construction

[0026] Nano-MoO for photocatalytic degradation 3 The preparation method of powder mainly comprises the following steps:

[0027] Step 1: According to the mass ratio between ammonium tetramolybdate and graphene oxide (60~600): 1 ratio, take a certain amount of graphene oxide solution and ammonium tetramolybdate to fully mix and stir at room temperature , to obtain mixed solution A, for subsequent use;

[0028] The concentration of the graphite oxide solution is 0.5-50 mg / mL, the stirring rate is 600-1200 rpm, and the stirring time is 25-35min. Here, the rate of stirring needs to be limited, because too fast stirring will destroy the graphene oxide sheet structure, making it too dispersed to form a flake shape, and too slow stirring will reduce the combination of graphene oxide and ammonium tetramolybdate properties, so that the template function of graphene oxide cannot be fully exerted.

[0029] Step 2: Put the mixed solution A under vacuum condition for 2~12h and then take...

Embodiment 1

[0036] (1) Take 100 mL of graphene oxide solution with a concentration of 0.5 mg / mL and 0.01 mol of ammonium tetramolybdate (ammonium tetramolybdate: graphene oxide mass ratio = 600:1) and fully mix and stir at room temperature, The stirring rate was 600 rpm, and the mixture was stirred for 30 minutes to prepare a mixed solution A for later use.

[0037] (2) The mixed solution A was placed under vacuum for 2 hours and then taken out to obtain the mixed solution B.

[0038] (3) Quickly freeze the mixed solution B with liquid nitrogen, and then put it into the freezer of the refrigerator for cryopreservation at -2°C for 2 hours to obtain a solid mixture C.

[0039] (4) Put the obtained solid mixture C into a freeze dryer, control the temperature of the cold trap at -60° C., and carry out freeze-drying for 2 hours under the condition of a vacuum of 9 Pa to obtain a dry mixture D for later use;

[0040] (5) Put the prepared dry mixture D into a muffle furnace, control the tempera...

Embodiment 2

[0044] (1) Take 100 mL of graphene oxide solution with a concentration of 50 mg / mL and 0.001 mol of ammonium tetramolybdate (ammonium tetramolybdate: graphene oxide mass ratio = 60:1) at room temperature to fully mix and stir, The stirring rate was 1200 rev / min, and the mixture was stirred for 25 minutes to prepare mixed solution A, which was set aside.

[0045] (2) The mixed solution A was placed under vacuum for 12 hours and then taken out to obtain the mixed solution B.

[0046] (3) Quickly freeze the mixed solution B with liquid nitrogen, and then put it into the freezer of the refrigerator for cryopreservation at -20°C for 24 hours to obtain a solid mixture C.

[0047] (4) Put the obtained solid mixture C into a freeze dryer, control the temperature of the cold trap at -70°C, and carry out freeze-drying for 12 hours under the conditions of a vacuum of 10 Pa to obtain a dry mixture D for use;

[0048] (5) Put the prepared dry mixture D into a muffle furnace, control the t...

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Abstract

The invention provides a preparation method of sheet-shaped agglomerated-state spherical nano MoO3 powder and belongs to technical application of preparation of nano powder through a wet chemical method. The preparation method of the MoO3 composite powder comprises the following steps: after mixing and stirring ammonium tetramolybdate and a graphene oxide solution, placing for a period of time invacuum; continually quickly freezing with liquid nitrogen and freezing and drying; finally, calcining in the air to obtain the sheet-shaped agglomerated-state spherical nano molybdenum trioxide powder. The preparation method provided by the invention has the advantages that the shape of the powder is unique and the granularity of the powder is uniform; raw materials are easy to obtain and a technology is simple and convenient; the preparation method also has the advantages of simplicity in operation, controllable process, stable product and the like. Prepared nano spherical MoO3 grains are uniformly arrayed to form a large sheet shape, and the powder has extremely excellent photocatalytic performance.

Description

technical field [0001] The present invention relates to MoO 3 The technical field of powder preparation, specifically a kind of nano-MoO with sheet-like agglomerated spherical structure for photocatalytic degradation 3 The preparation method of the powder belongs to a technical application of preparing nanometer powder by a wet chemical method. Background technique [0002] In recent years, the control and treatment of environmental pollution has become an important problem that humans need to solve urgently. Photocatalytic oxidation technology uses sunlight as an energy source to completely oxidize organic pollutants to CO 2 、H 2 O and non-toxic products are effective means for environmental pollution control. With the continuous deepening of people's research on the properties of nanomaterials and related preparation technologies, ultrafine powders with special morphology and functions are expected to have very attractive application prospects in environmental protectio...

Claims

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Application Information

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IPC IPC(8): B01J23/28C02F1/30C01G39/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G39/02C02F1/30B01J23/28C01P2004/20C01P2004/32C01P2004/50C02F2101/308C02F2305/10B01J35/39
Inventor 魏世忠潘昆明赵阳徐流杰张程毛丰陈冲周玉成李秀青王飞鸿杨艳萍王长记
Owner HENAN UNIV OF SCI & TECH
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