Preparation method, product and application of nano magnesium oxide

A technology of nano-magnesium oxide and magnesium hydroxide, which is applied in the field of environmental protection and purification, can solve the problems of high energy consumption, unfavorable industrialization, cost reduction, and long grain time, and achieve uniform particle size distribution, excellent effect, and particle size small diameter effect

Inactive Publication Date: 2021-06-01
INST OF MEDICAL SUPPORT TECH OF ACAD OF SYST ENG OF ACAD OF MILITARY SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional hydrothermal method takes a long time to prepare grains and consumes a lot of energy, which is not conducive to industrialization and cost reduction.

Method used

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  • Preparation method, product and application of nano magnesium oxide
  • Preparation method, product and application of nano magnesium oxide
  • Preparation method, product and application of nano magnesium oxide

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[0026] The embodiment of the present invention innovatively adopts magnesium methoxide as the starting material, and provides a preparation method of nano-magnesium oxide, which has the technical advantages of high efficiency, rapidity, and energy saving, and can prepare nano-magnesium oxide with small particle size, large specific surface area and particle size distribution. Uniform nano magnesium oxide. Include the following steps:

[0027] S1, using magnesium methoxide as a raw material to prepare magnesium hydroxide sol;

[0028] S2. Heating the magnesium hydroxide sol to 130-155°C at a constant heating rate and keeping it warm to obtain a magnesium hydroxide wet gel, and drying to obtain a magnesium hydroxide gel; a constant heating rate means that the fluctuation value of the heating rate is less than 1°C ;

[0029] S3, sintering the magnesium hydroxide xerogel to obtain nano magnesium oxide.

[0030] In a specific embodiment, the preparation method of magnesium hydro...

Embodiment 1

[0064] First, 50 mL of 7wt% Mg(OCH 3 ) 2 Add it into 120mL of toluene and perform magnetic stirring, and then add 1.5mL of deionized water dropwise to the above solution. Finally, react overnight at room temperature to obtain Mg(OH) in the gel state of the hydrolyzate 2 . Strain and wash two or three times.

[0065] Then the resulting gel-state Mg(OH) 2 The product was put into the closed autoclave of the microwave chemical synthesizer, and the multi-purpose microwave chemical synthesizer was used to directly input the initial temperature of 25°C, the final temperature of 150°C, the heating time of 20min, the holding time of 20min, and the heating rate of 6.25°C / min. During the heating and heat preservation process, the microwave power fluctuates in the range of 0-400W, and the pressure in the closed autoclave fluctuates in the range of 0-3MPa. After the microwave hydrothermal reaction is over, the product is cooled and filtered, washed with methanol for 3 to 4 times, d...

Embodiment 2

[0072] First, 40 mL of 10 wt% Mg(OCH 3 ) 2 Added to 130mL toluene and magnetically stirred, and then added dropwise 2mL deionized water to the above solution. Finally, react overnight at room temperature to obtain Mg(OH) in the gel state of the hydrolyzate 2 . Strain and wash two or three times. Then the resulting gel-state Mg(OH) 2 The product was put into the airtight autoclave of the microwave chemical synthesizer, and the multi-purpose microwave chemical synthesizer was used to directly input the initial temperature of 25°C, the final temperature of 155°C, the heating time of 30min, the holding time of 30min, and the heating rate of 4.83°C / min. During the heating and heat preservation process, the microwave power fluctuates in the range of 0-400W, and the pressure in the closed autoclave fluctuates in the range of 0-3MPa. After the microwave hydrothermal reaction is over, the product is cooled and filtered, washed with methanol for 3 to 4 times, dried in an oven ove...

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Abstract

The invention relates to the field of environmental protection and purification, in particular to a preparation method, a product and application of nano magnesium oxide. The invention provides a preparation method of the nano magnesium oxide. The method comprises the following steps: preparing magnesium hydroxide sol by using magnesium methoxide as a raw material; heating the magnesium hydroxide sol to 130-155 DEG C at a constant heating rate, and preserving heat to obtain magnesium hydroxide gel; and sintering the magnesium hydroxide gel to obtain the nano magnesium oxide. The preparation method of the nano magnesium oxide provided by the invention is efficient, rapid and energy-saving; the nano magnesium oxide with small particle size, large specific surface area and uniform particle size distribution can be prepared; and the nano magnesium oxide disclosed by the invention has excellent effects of degrading oxygen and phosphorus and adsorbing heavy metal ions such as Pb (II).

Description

technical field [0001] The invention relates to the field of environmental protection and purification, in particular to a preparation method of nano-magnesium oxide, its product and application. Background technique [0002] The smaller the particles of nano-magnesia, the more unsaturated bonds, edges, corners, and "defects" and ionized groups on the surface, and the stronger the adsorption and degradation force with organic poisons. However, the smaller the nano-magnesium oxide particles are, the easier it is to aggregate, and there are certain inconveniences in use. The hydrothermal method refers to a method of preparing materials in a sealed pressure vessel, using water as a solvent, dissolving and recrystallizing powder. Compared with other powder preparation methods, the powder prepared by the hydrothermal method has complete grain development, small particle size, uniform distribution, light particle agglomeration, cheaper raw materials can be used, and suitable stoi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/08C02F1/28B82Y30/00B82Y40/00C02F101/34C02F101/20
CPCC01F5/08C02F1/281B82Y30/00B82Y40/00C01P2004/04C01P2004/64C02F2101/20C02F2101/34
Inventor 林松刘士胜
Owner INST OF MEDICAL SUPPORT TECH OF ACAD OF SYST ENG OF ACAD OF MILITARY SCI
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