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A kind of preparation method of layered double metal hydroxide and its prepared product

A layered bimetal and hydroxide technology, which is applied in the direction of oxide/hydroxide preparation, chemical instruments and methods, aluminum compounds, etc., can solve the problems of limited application and disordered arrangement, and achieve regular arrangement, neat edges, The effect of simple process

Inactive Publication Date: 2019-03-29
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the LDH prepared by these methods has high crystallinity and large grain size, the arrangement is relatively disordered, which limits its application in the fields of catalysis and drug delivery.

Method used

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  • A kind of preparation method of layered double metal hydroxide and its prepared product
  • A kind of preparation method of layered double metal hydroxide and its prepared product
  • A kind of preparation method of layered double metal hydroxide and its prepared product

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preparation example Construction

[0022] The present invention provides a kind of preparation method of layered double metal hydroxide, comprising:

[0023] mixing a trivalent metal hydroxide and a divalent metal salt with a buffer solution having a pH value between 9-10 to obtain a reaction mixture;

[0024] React the obtained reaction mixture at a temperature of 100-300° C. for more than 10 hours. After the reaction is completed, separate and wash to obtain a layered double metal hydroxide.

[0025] In a specific embodiment, the trivalent metal hydroxide is selected from Al(OH) 3 , Cr(OH) 3 , Fe(OH) 3 , V(OH) 3 、Co(OH) 3 、La(OH) 3 and Ti(OH) 3 At least one of them, preferably one or two, more preferably one. In a specific embodiment, the divalent metal salt is dissolved in a buffer solution and is selected from Mg 2+ , Ca 2+ 、Sr 2+ 、Ba 2+ , Zn 2+ 、Ni 2+ , Fe 2+ 、Cu 2+ 、Co 2+ , Mn 2+ At least one of sulfate, nitrate, carbonate or chloride, preferably one or two, more preferably one. In a spe...

Embodiment 1

[0036] Prepare buffer solution

[0037] Weigh 14.0g NH 4 Cl, add 9.6mL NH 3 ·H 2 O, diluted to 200mL with deionized water, stirred evenly by magnetic force to obtain NH 3 ·H 2 O-NH 4 Cl buffer solution, the pH of the solution was measured with a pH meter=9.30.

Embodiment 2

[0039] Preparation of MgAl-LDH

[0040] Add 0.1950g (2.5mmol) Al(OH) to 50mL buffer solution 3 and 1.9232g (7.5mmol) Mg (NO 3 ) 2 ·6H 2 O, fully stirred evenly, added 0.4500g (11.25mmol) NaOH, stirred evenly, poured into a 100mL hydrothermal kettle, and the mixed solution was hydrothermally reacted at 140°C for 24h. After the reaction was completed, it was cooled at room temperature, the product was centrifuged, washed 5 times with deionized water, and then dried in an oven at 70° C. for 24 hours to obtain a white solid powder MgAl-LDH.

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Abstract

The embodiment of the invention provides a layered bimetal hydroxide preparation method, and a product prepared therethrough. The layered bimetal hydroxide preparation method comprises the following steps: mixing a trivalent metal hydroxide, a divalent metal salt and a buffer solution with the pH value of 9-10 to obtain a reaction mixture; and carrying out a reaction on the reaction mixture at 100-300 DEG C for 10 h or above, and separating and washing the obtained reaction product after the reaction ends in order to obtain layered bimetal hydroxide. The trivalent metal hydroxide is adopted as a precursor, the layered bimetal hydroxide is prepared in the weakly alkaline buffer solution, and the obtained layered bimetal hydroxide keeps the basic morphology of the precursor trivalent metal hydroxide, and also has the characteristics of regularly edge and structured arrangement. The improvement of the above microstructure expands the application of the layered bimetal hydroxide in the fields of catalysis and drug delivery. The method has a simple process flow, and is suitable for the large-scale production of the layered bimetal hydroxide.

Description

technical field [0001] The invention relates to the technical field of preparation of functional materials, in particular to a method for preparing layered double metal hydroxides and products prepared therefrom. Background technique [0002] Layered double hydroxide (LDH) is a layered compound formed by stacking interlayer anions and positively charged laminates. Due to its unique structural characteristics, the interlayer anions of LDH are exchangeable, and can be exchanged with various inorganic anions, organic anions, heteropolyacid ions, etc. This property of LDH can be used to prepare LDH with different anion intercalation, so as to obtain new materials with different functions. And by adjusting M on the LDH laminate Ⅱ (divalent metal ions) and M Ⅲ (trivalent metal ions) ratio, can adjust the charge density on the laminate, and then control the number of guest anions between the layers. The composite metal oxide obtained by LDH after calcination has a larger specif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B13/14C01F7/00
CPCC01B13/14C01F7/00C01P2002/22C01P2002/72C01P2004/03C01P2004/61
Inventor 杨晓晶李亚男
Owner BEIJING NORMAL UNIVERSITY
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