Preparation method of nitrate radical intercalation lithium-aluminum layered bimetal hydroxide

A layered bimetallic and nitrate intercalation technology, applied in the fields of aluminum compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as difficulties, low product crystallinity, complicated and cumbersome operation process, etc., and achieve simple operation and crystallization high degree of effect

Inactive Publication Date: 2017-12-22
BEIJING NORMAL UNIVERSITY +1
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Problems solved by technology

[0005] However, one-step synthesis of NO 3 -LDH is extremely difficult. In the prior art, it has been reported that co-precipitation method is used to synthesize nitrate intercalation lithium aluminum layered double metal hydroxide (LiAl-NO for short) with sodium hydroxide as precipitant. 3 -LDH), but the crystallinity of the product is not high, and the pH value of the solution needs to be strictly controlled during the synthesis process to ensure that the two cations are precipitated at the same time.
In addition, in order to ensure the purity of the product, it is necessary to use deionized water that excludes carbon dioxide during the reaction process, and introduce N 2 Gas protection and continuous stirring, the operation process is more complicated and cumbersome

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  • Preparation method of nitrate radical intercalation lithium-aluminum layered bimetal hydroxide
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  • Preparation method of nitrate radical intercalation lithium-aluminum layered bimetal hydroxide

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preparation example Construction

[0025] The invention provides a method for preparing a nitrate-intercalated lithium-aluminum layered double hydroxide, comprising:

[0026] Lithium nitrate, aluminum nitrate, and precipitant are added to water, and the reaction mixture is obtained after dissolving;

[0027] React the reaction mixture at 120-160°C (hydrothermal) for 24-48 hours;

[0028] After the reaction is finished, the precipitate is separated, washed and dried to obtain a nitrate-intercalated lithium-aluminum layered double metal hydroxide.

[0029] The inventors of the present invention have found through research that lithium-aluminum layered double hydroxides intercalated with nitrate can be synthesized in one step by using a uniform precipitation method and hydrothermal reaction.

[0030] In a specific embodiment of the present invention, lithium nitrate, aluminum nitrate and precipitating agent can be dissolved in water to obtain a reaction mixture, and then the reaction mixture is transferred to a h...

Embodiment 1

[0039] Weigh 4.14g LiNO respectively 3 (0.06mol, 1.2M), 7.50g Al(NO 3 ) 3 9H 2 O (0.02mol, 0.4M), urea 1.44g (0.024mol, 0.48M), feed ratio Li:Al:CO(NH 2 ) 2 = 3:1:1.2. Dissolve in 50mL deionized water, put in a hydrothermal kettle, and react at 120°C for 48 hours. The resulting precipitate (product) was filtered, washed three times with deionized water, dried at 40° C. for 24 hours, and ground to obtain a white powder.

Embodiment 2

[0041] Weigh 4.14g LiNO respectively 3 (0.06mol, 1.2M), 7.50g Al(NO 3 ) 3 9H 2 O (0.02mol, 0.4M), urea 1.92g (0.032mol, 0.64M), feed ratio Li:Al:CO(NH 2 ) 2 = 3:1:1.6. Dissolve in 50mL deionized water, put in a hydrothermal kettle, and react at 120°C for 48 hours. The resulting precipitate (product) was filtered, washed three times with deionized water, dried at 40° C. for 24 hours, and ground to obtain a white powder.

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Abstract

The embodiment of the invention provides a preparation method of a nitrate radical intercalation lithium-aluminum layered bimetal hydroxide. The method comprises the following steps of adding lithium nitrate, aluminum nitrate and precipitators into water; obtaining reaction mixed solution after the dissolution; performing reaction on the reaction mixed solution at 120 to 160 DEG C for 24 to 48 hours; after the reaction is completed, performing separation, washing and precipitate drying to obtain the nitrate radical intercalation lithium-aluminum layered bimetal hydroxide. The LiAl-NO3-LDH is directly synthesized through one-step reaction. The method has the advantages that the strict control on the pH value of the solution is not needed in the synthesis process; the carbon dioxide removal treatment on the water used as a solvent is not needed; the introduction of N2 gas for protection is not needed; the stirring is not needed; the operation is simple. In addition, the crystallinity degree of products prepared by the method provided by the invention is high.

Description

technical field [0001] The invention relates to the technical field of preparation of layered double metal hydroxides, in particular to a preparation method of lithium aluminum layered double metal hydroxides intercalated with nitrate radicals. Background technique [0002] Layered double hydroxides (LDH for short), a layered material composed of positively charged laminates and interlayer anions, have attracted extensive attention due to their unique properties. LDH has a large specific surface area, good thermal stability and strong ion exchange capacity, so it is used in catalysts, ceramic precursors, adsorbents, ion exchangers, optical and electroactive materials, two-dimensional nano-solid reactors, Bioactive nanocomposites and other fields have a wide range of applications. [0003] According to the types of metal ions and the charges that make up the laminates, LDHs are mainly divided into two categories. One type is hydrotalcite-type LDH represented by MgAl-LDH (ma...

Claims

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Application Information

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IPC IPC(8): C01F7/00
CPCC01P2002/72C01P2002/82C01P2004/03C01F7/78
Inventor 马淑兰刘晨昱王征袁萌伟
Owner BEIJING NORMAL UNIVERSITY
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