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A kind of method for preparing layered double metal hydroxide from li/mg mixed liquor

A layered bimetallic, hydroxide technology, applied in chemical instruments and methods, aluminum compounds, magnesium compounds, etc., can solve problems such as no reports, and achieve the effect of high added value

Inactive Publication Date: 2019-04-09
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] How to successively prepare nitrate-intercalated lithium-aluminum layered double hydroxides (LiAl-NO 3 -LDH) and nitrate-intercalated magnesium-aluminum layered double hydroxides (MgAl-NO 3 -LDH), has not been reported

Method used

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  • A kind of method for preparing layered double metal hydroxide from li/mg mixed liquor
  • A kind of method for preparing layered double metal hydroxide from li/mg mixed liquor
  • A kind of method for preparing layered double metal hydroxide from li/mg mixed liquor

Examples

Experimental program
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Embodiment 1

[0044] Embodiment 1 prepares Li / Mg mixed solution

[0045] Weigh 4.14g LiNO 3 (0.06mol, 0.12M), 10.24g Mg(NO 3 ) 2 ·6H 2 O (0.04mol, 0.8M) was dissolved in 50mL deionized water to obtain a Li / Mg mixture.

[0046] It should be noted that the Li / Mg mixed liquids used in the following examples were all prepared by the method of Example 1.

Embodiment 2

[0047] Example 2 Synthesis of LiAl-NO 3 -LDH and MgAl-NO 3 -LDH

[0048] Al(NO 3 ) 3 9H 2 O (0.02mol, 0.4M) and 1.44g urea (0.024mol, 0.48M) were completely dissolved and then transferred to a hydrothermal kettle to react at 120°C for 48h. The resulting product was filtered (filtrate recovery), the solid product was washed 3 times with deionized water, dried at 40°C for 24 hours, and ground to obtain a white powder LiAl-NO 3 -LDH.

[0049] Add 2.88g (0.048mol, 0.96M) of urea to the recovered filtrate, put it into a hydrothermal kettle, and react at 120°C for 48h. The obtained product was filtered, washed, dried at 40°C for 24 hours, and ground to obtain a white powder MgAl-NO 3 -LDH.

Embodiment 3

[0050] Example 3 Synthesis of LiAl-NO 3 -LDH and MgAl-NO 3 -LDH

[0051] Al(NO 3 ) 3 9H 2 O (0.02mol, 0.4M) and 1.44g urea (0.024mol, 0.48M) were completely dissolved and then transferred to a hydrothermal kettle to react at 140°C for 24h. The resulting product was filtered (filtrate recovery), the solid product was washed 3 times with deionized water, dried at 40°C for 24 hours, and ground to obtain a white powder LiAl-NO 3 -LDH.

[0052] Add 2.88g (0.052mol, 1.04M) of urea to the recovered filtrate, put it into a hydrothermal kettle, and react at 140°C for 24h. The obtained product was filtered, washed, dried at 40°C for 24 hours, and ground to obtain a white powder MgAl-NO 3 -LDH.

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PUM

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Abstract

The embodiment of the present invention provides a method for preparing layered double metal hydroxide from Li / Mg mixed solution, comprising: (1) obtaining Li / Mg mixed solution, said Li / Mg mixed solution is containing Li + , Mg 2+ and NO 3 ‑ (2) adding aluminum nitrate and the first precipitating agent to the Li / Mg mixed solution, reacting at 100-160°C for 24-48 hours; wherein the molar ratio of the first precipitating agent to aluminum nitrate is (1‑2): 1; (3) after the reaction in step (2), filter to obtain solid product and filtrate; (4) wash and dry the solid product obtained in step (3) to obtain LiAlNO 3 ‑LDH; (5) adding a second precipitating agent to the filtrate obtained in step (3), and reacting for 24‑48 hours at 100‑160 °C; wherein the second precipitating agent and the Mg in the Li / Mg mixed solution 2+ The molar ratio is (1-2): 1; (6) after the reaction of step (5) finishes, filter, obtain solid product, after washing, drying, obtain MgAl-NO 3 -LDH.

Description

technical field [0001] The invention relates to the technical field of layered double metal hydroxides, in particular to a method for preparing layered double metal hydroxides from Li / Mg mixed liquid. Background technique [0002] Layered double hydroxide (LDH for short) has attracted more and more attention and research in recent years. The special layered crystal structure of LDH makes it useful in catalysis, photochemistry, electrochemistry, magnetization, biomedicine and environment. The field has good prospects for development. LDH, also known as hydrotalcite-like compounds, is a class of anionic layered clay compounds. There are many types and complex structures, and its structural characteristics are: metal hydroxides are arranged regularly to form laminates, and anions and water molecules are located between the layers. Its general formula can be expressed as: [M z+ 1–x m 3+ x (OH) 2 ] q+ (A n– q / n )·yH 2 O; The two main types of LDH are determined by the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/00C01F7/00
CPCC01F5/00C01F7/78
Inventor 马淑兰王征杜筱佳刘晨昱
Owner BEIJING NORMAL UNIVERSITY