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Flaky structure layered composite hydroxide and preparation method thereof

A sheet-like structure, hydroxide technology, applied in the field of layered composite hydroxide and its preparation, can solve the problems of inconvenient industrial production, complicated post-processing process, etc.

Inactive Publication Date: 2014-08-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method requires the use of organic solvents and surfactants, and the surfactant needs to be removed in the later stage of preparation. The post-treatment process is complicated, limited to experimental research, and is not convenient for industrial production.

Method used

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  • Flaky structure layered composite hydroxide and preparation method thereof
  • Flaky structure layered composite hydroxide and preparation method thereof
  • Flaky structure layered composite hydroxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step A: Weigh 0.78g Al(OH) 3 Add it into 50ml of deionized water, grind it in a colloid mill for 15 minutes, and prepare a 15.6g / L slurry.

[0031] Step B: take by weighing 5.128g Mg(NO 3 ) 2 ·6H 2 O was added to the slurry prepared in step A, and mixed uniformly to obtain Mg(NO 3 ) 2 and Al(OH) 3 of the mixture.

[0032] Step C: Weigh 4.8g of urea and 0.2g of NaOH into 40ml of deionized water to prepare a solution.

[0033] Step D: Add the solution prepared in step C to the mixed solution in step B at 90°C with stirring, then continue to stir and react at 100°C for 24 hours, cool the slurry to room temperature after the reaction, and centrifugally wash the precipitate When the pH value is less than 8, dry the sample in an oven at 100°C for 12 hours to obtain the LDH product. Elemental analysis shows that the chemical composition formula of the product is: Mg 0.66 al 0.34 (OH) 2 (CO 3 ) 0.17 0.74H 2 O, using the BET specific surface area test method to mea...

Embodiment 2

[0035] Step A: Weigh 1.16g Mg(OH) 2 Add it into 100ml of deionized water, grind the slurry in a colloid mill for 10min, and prepare a slurry of 11.6g / L.

[0036] Step B: take by weighing 3.75g Al(NO 3 ) 3 9H 2 O is added to the slurry prepared in step A, and mixed evenly to obtain Mg(OH) 2 and Al(NO 3 ) 3 of the mixture.

[0037] Step C: Weigh 0.8g NaOH and 2.12g Na 2 CO 3 Add to 40ml deionized water to prepare a solution.

[0038] Step D: Add the solution prepared in step C dropwise to the mixture prepared in step B within 6 hours under stirring at 100°C, continue to stir and react at 100°C for 12 hours after the dropwise addition, and cool the slurry after the reaction After reaching room temperature, the precipitate was centrifuged, washed with water until the pH value was less than 8, filtered and dried. Elemental analysis shows that the chemical composition formula of the product is: Mg 0.66 al 0.34 (OH) 2 (CO 3 ) 0.17 0.59H 2 O, BET analysis shows that it...

Embodiment 3

[0040] Step A: take by weighing 1.2g pseudo-boehmite (Al 2 o 3 ·H 2 O) Add it into 100ml deionized water, grind the slurry in a ball mill for 5min, and prepare a 6g / L slurry.

[0041] Step B: Weigh 0.6894g LiNO 3 Add to the slurry prepared in step A, mix well to obtain LiNO 3 and Al 2 o 3 ·H 2 O mixture.

[0042] Step C: Weigh 4.8g of urea and add it into 20ml of deionized water to prepare a solution.

[0043] Step D: Add the solution prepared in step C to the mixture prepared in step B at 90°C with stirring, then continue to stir and react at 100°C for 24 hours, cool the slurry to room temperature after the reaction, centrifuge the precipitate, Wash with water until the pH value is less than 8, filter and dry to obtain the LDH product. Elemental analysis shows that the chemical composition formula of the product is: Li 0.34 al 0.66 (OH) 2 (CO 3 ) 0.17 0.57H 2 O, BET analysis shows that its specific surface area is 145.5m 2 / g.

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Abstract

The present invention provides a flaky structure layered composite hydroxide and a preparation method thereof. According to the preparation method, a metal hydroxide, an oxide, a basic carbonate, a metal soluble salt and an alkali are adopted as raw materials, the addition speed of the alkali solution is controlled to prepare the flaky LDH, and the space confinement effect of the metal hydroxide, the oxide or the basic carbonate exists, such that the produced LDH flakes do not easily aggregate so as to finally obtain the LDH with a large specific surface, wherein the BET specific surface area is 130-200 m<2> / g and is much larger than the specific surface area of the ordinary LDH. According to the invention, the preparation method has characteristics of simpleness, no requirement of high temperature, high pressure and special equipment, rich raw material source and low cost; and the flaky structure layered composite hydroxide can be widely used in the fields of absorption separation, catalysis, polymer materials and the like.

Description

[0001] Field [0002] The invention relates to the field of inorganic non-metallic functional materials and preparation thereof, in particular to a layered composite hydroxide and a preparation method thereof. Background technique [0003] Layered double hydroxides (LDH for short) is a kind of anionic layered clay, its chemical formula is [M 2+ 1-x m 3+ x (OH) 2 ] x+ (A n- x / n )·mH 2 O, where M 2+ , M 3+ Represent divalent and trivalent metal cations respectively, x represents the change of the content of metal elements, A n- Represents interlayer anions. LDHs have attracted extensive attention in recent years due to their unique two-dimensional layered structure and the exchangeability of interlayer anions. The unique properties of LDH make it widely used in the fields of catalysis, adsorption, ion exchange and polymer additives (flame retardants, thermal stabilizers and other functional additives). [0004] The specific surface area of ​​a material has an import...

Claims

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Application Information

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IPC IPC(8): C01B13/14
Inventor 李殿卿唐平贵冯拥军冯俊婷
Owner BEIJING UNIV OF CHEM TECH
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