Method for preparing two-dimensional single-layer magnesium-aluminum layered double-metal hydroxide nanosheets

A layered bimetallic and hydroxide technology, applied in the direction of alumina/aluminum hydroxide, nanotechnology, nanotechnology, etc., to achieve the effects of low cost, simple preparation process, and reusable solvents

Inactive Publication Date: 2015-01-21
BEIJING NORMAL UNIVERSITY +1
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Generally speaking, the method of preparing two-dimensional nanosheets by using the bottom-up method is relatively simple, but the preparation of two-dimensional single-layer magnesium-aluminum layered double metal hydroxide nanosheets by using the bottom-up synthesis method has not been reported yet.

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  • Method for preparing two-dimensional single-layer magnesium-aluminum layered double-metal hydroxide nanosheets
  • Method for preparing two-dimensional single-layer magnesium-aluminum layered double-metal hydroxide nanosheets
  • Method for preparing two-dimensional single-layer magnesium-aluminum layered double-metal hydroxide nanosheets

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preparation example Construction

[0037] The preparation method of the two-dimensional single-layer magnesium-aluminum layered double hydroxide nanosheet comprises the following steps:

[0038] a) After mixing the magnesium salt, aluminum salt and formamide, perform ultrasonic vibration until the mixture becomes a transparent solution to form solution A, wherein the molar ratio of magnesium ions in the magnesium salt to aluminum ions in the aluminum salt is 2:1; It is preferably at least one of magnesium nitrate, magnesium chloride and magnesium sulfate; the aluminum salt includes: at least one of aluminum nitrate, aluminum chloride and aluminum sulfate; and the ratio of the volume of formamide to the molar number of aluminum in the aluminum salt is (2~8)L / mol.

[0039] Since commercially available magnesium nitrate and aluminum nitrate generally have crystal water, magnesium nitrate is preferably magnesium nitrate hexahydrate {Mg(NO 3 ) 2 ·6H 2 O}, aluminum nitrate is preferably aluminum nitrate nonahydrat...

Embodiment 1

[0053] Because commercially available aluminum nitrate and magnesium nitrate are generally with crystal water, therefore, present embodiment uses commercially available magnesium nitrate hexahydrate {Mg(NO 3 ) 2 ·6H 2 O} and aluminum nitrate nonahydrate {Al(NO 3 ) 3 9H 2 O} as raw material to prepare two-dimensional single-layer magnesium-aluminum layered bimetallic hydroxide nanosheets.

[0054] It should be emphasized that whether aluminum nitrate and magnesium nitrate have water of crystallization has no influence on the present invention, so aluminum nitrate and magnesium nitrate without water of crystallization can also be used to realize the technical solution to be invented.

[0055] Concrete preparation process is as follows:

[0056] 2.05g (8mmol) Mg(NO 3 ) 2 ·6H 2 O and 1.50g (4mmol) Al(NO 3 ) 3 9H 2 O was dissolved in 15ml of formamide, and ultrasonically stirred until the solution was transparent to form solution A. Dissolve 1.92g (48mmol) NaOH in 35mL ...

Embodiment 2

[0058] 0.76g (8mmol) MgCl 2 and 0.53g (4mmol) AlCl 3 Dissolve in 8ml of formamide and stir ultrasonically until the solution becomes transparent to form solution A. According to the ratio of the amount of sodium hydroxide to aluminum ion being 9:1, 1.44g (36mmol) NaOH was gradually added to solution A, and stirred vigorously for 60min until it was completely dissolved to obtain a colloidal mixture. After the obtained colloidal mixed solution was centrifuged at a speed of 15000 rad / min for 3 min, the colloidal substance in the lower layer was redispersed in 40 mL of formamide and stirred until uniformly dispersed, then the dispersion was transferred to a 100 mL polytetrafluoroethylene reaction kettle, 20 ℃ for 72 hours to obtain a two-dimensional single-layer magnesium-aluminum layered double metal hydroxide nanosheet dispersion.

[0059] It should be noted that when obtaining the two-dimensional single-layer magnesium-aluminum layered double hydroxide nanosheet dispersion li...

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Abstract

The invention discloses a method for preparing two-dimensional single-layer magnesium-aluminum layered double-metal hydroxide nanosheets. The method comprises the following steps: (a) dissolving a magnesium salt and an aluminum salt in formamide, thereby forming a liquid A, wherein a molar ratio of magnesium ions in the magnesium salt to aluminum ions in the aluminum salt is 2:1; (b) mixing a strong alkaline hydroxide with the liquid A, thereby obtaining a colloidal mixed liquid, wherein the molar ratio of the strong alkaline hydroxide to the aluminum ions in the aluminum salt is (9-15):1; and (c) carrying out a hydrothermal reaction on the colloidal mixed liquid obtained in the step (b), thereby obtaining the two-dimensional single-layer magnesium-aluminum layered double-metal hydroxide nanosheets, wherein the two-dimensional single-layer magnesium-aluminum layered double-metal hydroxide nanosheets are dispersed in the solvent formamide, and forming the dispersion of the two-dimensional single-layer magnesium-aluminum layered double-metal hydroxide nanosheets, wherein the temperature of the hydrothermal reaction is 20-70 DEG C, and the reaction time is 2-72 hours. The method is low in cost, simple in preparation process, short in production cycle and suitable for industrial production, and the solvent can be recycled.

Description

technical field [0001] The invention relates to the field of preparation of two-dimensional nanosheets, in particular to a preparation method of two-dimensional single-layer magnesium-aluminum layered double metal hydroxide nanosheets. Background technique [0002] Layered double hydroxide (LDH) is a layered compound formed by stacking positively charged metal laminates and interlayer anions, and its structure is similar to brucite Mg(OH) 2 , which are connected by metal-oxygen octahedra to form the main layer, so they are also called hydrotalcite-like compounds. Since trivalent ions (also tetravalent transition metal ions) replace part of the divalent metal ions to positively charge the metal laminate, it is necessary to introduce anions into the interlayer to balance the charge, and usually some crystal water exists in the interlayer position. . The metal elements of the main layer of LDH are adjustable, and there is a strong covalent bond between the metal and oxygen; t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B82Y30/00
CPCC01P2004/64C01F7/785
Inventor 杨晓晶梁杜鹃
Owner BEIJING NORMAL UNIVERSITY
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