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A kind of wheat spike-shaped porous magnesium oxide and its preparation method

A porous magnesia and wheat ear-shaped technology, applied in the direction of magnesia, etc., can solve the problems of difficult separation and treatment of organic solvents, increase the difficulty of waste liquid treatment, and few research reports, and achieve rich surface pores, fast adsorption rate, and process simple effect

Active Publication Date: 2019-03-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the activated carbon or molecular sieve used for loading greatly increases the cost
The preparation process of these two methods uses organic reagents to realize the control of the morphology, pore structure, and specific surface area of ​​magnesium oxide, which increases the difficulty of reaction process control and waste liquid treatment after reaction, and easily causes secondary pollution.
[0004] The reaction performance of porous magnesium oxide is related to factors such as the number of hydroxyl groups on the surface, surface charge, pore structure, and aggregate structure between particles. In various preparation methods, organic reagents are often used to control the surface morphology and affect its surface performance, or use a porous carrier in order to obtain a specific dispersion of magnesium oxide, the organic solvent is not easy to separate and handle, and it is easy to cause secondary pollution
There are few research reports on the preparation method of porous magnesium oxide without surfactant and carrier participation

Method used

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  • A kind of wheat spike-shaped porous magnesium oxide and its preparation method
  • A kind of wheat spike-shaped porous magnesium oxide and its preparation method
  • A kind of wheat spike-shaped porous magnesium oxide and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Ultrasonic dissolve 4.1g magnesium chloride hexahydrate and 1.2g aluminum chloride hexahydrate in 50mL deionized water, where Mg 2+ The concentration is 0.2mol / L; Al 3+ The concentration is 0.05mol / L, Al 3+ With Mg 2+ The ratio is 0.25; then 6.0g of urea is ultrasonically dissolved in 50mL of deionized water, and the two completely dissolved solutions are mixed and stirred evenly;

[0030] Step 2: Transfer the solution obtained in step 1 to a hydrothermal reactor, react at 140°C for 12 hours, with a stirring speed of 500r / min, naturally cool to room temperature, centrifuge and wash with deionized water to neutral;

[0031] Step 3: Dry the filter cake obtained above at 80°C for 12h, grind the obtained sample to powder, set the heating rate to 5°C / min, calcination temperature 550°C, and calcination time 3h in an air atmosphere in a muffle furnace , It is calcined to obtain magnesium oxide. Its specific surface area is 95.28m 2 / g, the pore volume is 0.19cm 3 / g.

[0032...

Embodiment 2

[0039] Step 1: Dissolve 5.1g magnesium nitrate hexahydrate and 3.8g aluminum nitrate nonahydrate ultrasonically in 50mL deionized water (Mg 2+ The concentration is 0.2mol / L, Al 3+ The concentration is 0.1mol / L, Al 3+ With Mg 2+ The ratio is 0.5), and then ultrasonically dissolve 7.0g of hexamethylenetetramine in 50mL of deionized water, and then mix the two completely dissolved solutions and stir evenly;

[0040] Step 2: Transfer the solution obtained in step 1 to a hydrothermal reactor, react at 160°C for 12 hours, with a stirring speed of 500r / min, naturally cool to room temperature, centrifuge, and wash with deionized water until neutral;

[0041] Step 3: Dry the filter cake obtained above at 80°C for 12 hours, grind the obtained sample to powder, set the heating rate to 10°C / min, calcination temperature 500°C, and calcination time 4h in an air atmosphere in a muffle furnace , It is calcined to obtain magnesium oxide. Its specific surface area is 132.5m 2 / g, the pore volume is ...

Embodiment 3

[0044] Step 1: Dissolve 4.9g magnesium sulfate heptahydrate and 6.7g aluminum sulfate octahydrate ultrasonically in 50mL deionized water (Mg 2+ The concentration is 0.2mol / L, Al 3+ The concentration is 0.02mol / L, Al 3+ With Mg 2+ The ratio is 0.1), and then ultrasonically dissolve 11.5 g of ammonium carbonate in 50 mL of deionized water, and then mix the two completely dissolved solutions and stir them evenly;

[0045] Step 2: Transfer the solution obtained in step 1 to a hydrothermal reactor, react at 180°C for 12 hours, with a stirring speed of 600r / min, naturally cool to room temperature, centrifuge and wash with deionized water to neutral;

[0046] Step 3: Dry the filter cake obtained above at 80°C for 12h, grind the obtained sample to powder, set the heating rate 5°C / min, calcination temperature 600°C, and calcination time 3h in an air atmosphere in a muffle furnace , It is calcined to obtain magnesium oxide. Its specific surface area is 87.3m 2 / g, the pore volume is 0.18cm 3...

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Abstract

The invention provides an ear-like porous magnesium oxide material and a preparation method thereof. The porous magnesium oxide material is obtained by adopting a hydrothermal method, utilizing the characteristic that aluminum hydroxide is soluble in alkaline conditions to generate aluminum hydroxide in situ to play a role as a template and in guiding and pore-forming to synthesize a precursor androasting. Aluminum salt is added to replace conventional organic solvent, dispersant and morphology regulator, and double effects of pore forming and morphology control are realized. Experiments showthat under given conditions, prepared magnesium oxide presents ear-like morphology, specific surface area of magnesium oxide is within a range of 10-300m2 / g, and magnesium oxide has the advantages ofexcellent pore structure and high adsorptivity. The preparation method has the advantages of simple steps, convenience in operation and rich raw material sources, and magnesium oxide with ear-like morphology has wide application prospect in the field of sewage treatment, catalysis and resource recycling.

Description

Technical field [0001] The invention relates to the field of preparation of inorganic functional materials, in particular to a porous magnesium oxide and a preparation method thereof. The magnesium oxide has a porous structure and can be used as an adsorbent, a solid alkali catalyst and other fields. Background technique [0002] Magnesium oxide is a widely used metal oxide material. It has the advantages of stable properties, high surface activity, wide application range, non-toxic and harmless, etc. It plays a role in the fields of catalysis, photoelectric, flame retardant, heat storage, and toxic substance adsorption. Important role. More and more extensive applications have put forward more demands on the structure and properties of magnesium oxide materials, mainly focusing on high specific surface area, uniform particle size and pore size distribution, excellent dispersion, and high reaction activity. In the current synthesis methods, in order to control the structure of m...

Claims

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Application Information

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IPC IPC(8): C01F5/06
Inventor 冯拥军郭艺伟李殿卿唐平贵
Owner BEIJING UNIV OF CHEM TECH
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