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Annular Mg-Al double-hydroxy composite metal hydroxide and preparation method thereof

A double hydroxyl compound and hydroxide technology, applied in the direction of alumina/aluminum hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of product purity impact, product target morphology collapse, etc. To achieve the effect of controllable shape, environment-friendly and uniform structure

Inactive Publication Date: 2013-01-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the introduction of these templates not only easily leads to the collapse of the target morphology of the product, but is more likely to affect the purity of the product

Method used

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  • Annular Mg-Al double-hydroxy composite metal hydroxide and preparation method thereof
  • Annular Mg-Al double-hydroxy composite metal hydroxide and preparation method thereof
  • Annular Mg-Al double-hydroxy composite metal hydroxide and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) MgCl 2 ·6H 2 O was dissolved in deionized water to prepare 20 ml of 4mol / L solution. Add MgO / MgCl in a constant temperature oil bath at 70°C 2 ·6H 2 O molar ratio is the MgO powder of 0.1, after stirring for 0.5 hours, stand at room temperature for 24 hours, put the obtained colloid into a volume of 50 milliliters of reaction kettle, 160 ° C in an oven, react for 6 hours, the product is washed with deionized water, and placed at room temperature Dried to Mg 10 (OH) 18 Cl 2 ·5H 2 O nanowires.

[0026] (2) 1.25 mmol AlCl 3 ·6H 2O and 6.75 millimoles of urea are dissolved in the mixed solvent of 25 milliliters of water and n-dodecanethiol to prepare the reaction solution, stir and ultrasonically dissolve all the reactants; the concentration of aluminum ion in the mixed solvent in the reaction solution is 0.05mol / L; the concentration of urea is 0.27mol / L; the volume ratio of organic solvent and water in the mixed solvent is 4:1.

[0027] (3) the Mg in the st...

Embodiment 2

[0030] (1) with embodiment one.

[0031] (2) 0.5 mmol Al 2 (SO 4 ) 3 18H 2 O and 2.7 millimoles of urea were dissolved in a mixed solvent of 50 milliliters of water and n-dodecyl alcohol to prepare a reaction solution, stirred and ultrasonicated until all the reactants were dissolved; the concentration of aluminum ions in the mixed solvent in the reaction solution was 0.01mol / L ; Urea concentration is 0.054mol / L; The volume ratio of organic solvent and water in the mixed solvent is 8:1.

[0032] (3) the Mg in the step (1) 10 (OH) 18 Cl 2 ·5H 2 O nanowire 0.106 gram is added in the above-mentioned reaction solution; Make the mol ratio of nanowire and Al salt be 0.3: 1, carry out solvothermal reaction in reactor, reaction temperature is 160 ℃, and reaction time is 4 hours, after reaction finishes, naturally Cool to room temperature; discharge, wash the obtained precipitate with water and ethanol, and dry to obtain MgAl-CO 3 Hydrotalcite nanorings.

[0033] For characte...

Embodiment 3

[0035] (1) with embodiment one.

[0036] (2) 10 mmol Al(NO 3 ) 3 9H 2 O and 48 millimoles of urea were dissolved in the mixed solvent of 100 milliliters of water and n-hexanol to prepare the reaction solution, stirred and ultrasonicated until the reactant was completely dissolved; the concentration of aluminum ions in the mixed solvent in the reaction solution was 0.1mol / L; urea The concentration is 0.48mol / L; the volume ratio of organic solvent and water in the mixed solvent is 1:1.

[0037] (3) the Mg in the step (1) 10 (OH) 18 Cl 2 ·5H 2 1.414 grams of O nanowires are added in the above-mentioned reaction liquid; Make the mol ratio of nanowires and Al salt be 0.2: 1, carry out solvothermal reaction in reactor, reaction temperature is 100 ℃, and reaction time is 48 hours, after reaction finishes, naturally Cool to room temperature; discharge, wash the obtained precipitate with water and ethanol, and dry to obtain MgAl-CO 3 Hydrotalcite nanorings.

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Abstract

The invention relates to an annular Mg-Al double-hydroxy composite metal hydroxide and a preparation method thereof. The annular Mg-Al double-hydroxy composite metal hydroxide belongs to orthorhombic system and is layered, the internal diameter is 200-300nm, the external diameter is 700-800mum, the pore volume is 0.25-0.40cm<3> / g, the specific surface area is 54.37-83.26m<2> / g, the purity is high, and the degree of crystallization is good. The preparation method is characterized by using Mg10(OH)18Cl2-5H2O nano wires as the reaction precursor, dissolving urea and soluble Al salt in an organic solvent to prepare a reaction solution, adding the nano wires to the reaction solution to conduct solvothermal reaction in an enclosed system to obtain the annular MgAl-CO3 hydrotalcite. According to the invention, the annular Mg-Al double-hydroxy composite metal hydroxide has unique morphology and excellent performance index, thus the annular Mg-Al double-hydroxy composite metal hydroxide has a wide application prospect in the fields of catalysis, adsorption, drug slow release, etc.

Description

technical field [0001] The invention relates to a cyclic magnesium-aluminum double hydroxyl composite metal hydroxide (MgAl-CO 3 A hydrotalcite nano ring) and a preparation method thereof belong to the technical field of inorganic advanced nano material preparation technology. technical background [0002] Hydrotalcite compound is a layered double hydroxy compound metal hydroxide, because of its main layer elements and adjustable layer spacing, exchangeability of interlayer anions, structural memory effect and thermal stability, alkalinity, etc. The characteristics make hydrotalcite materials have important applications in the fields of catalysis or catalyst precursors, adsorption, electrical and photosensitive materials, biology, and ion exchange. [0003] In view of the fact that the morphology of hydrotalcite materials has an important impact on its optical, electrical, magnetic and catalytic properties, such as hydrotalcites with three-dimensional ordered macroporous st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B82Y40/00B82Y30/00
Inventor 孙晓明杨淼森常铮段雪
Owner BEIJING UNIV OF CHEM TECH
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