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Atom economic preparation method for laminated composite metal hydroxide

A hydroxide and layered composite technology, applied in the direction of oxide/hydroxide preparation, etc., can solve the problems of unavoidable by-product formation and washing process, structure cannot be restored, etc., to achieve the effect of protecting the environment and saving water resources

Active Publication Date: 2010-08-11
临沂万新海纳材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the recovery of the structure is possible when the calcination temperature is below 500°C. When the calcination temperature is above 600°C, a calcination product with a spinel structure is formed, and the structure cannot be recovered permanently.
This method also requires the synthesis of LDHs precursors in advance, which cannot avoid the generation of by-products and the washing process

Method used

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  • Atom economic preparation method for laminated composite metal hydroxide
  • Atom economic preparation method for laminated composite metal hydroxide
  • Atom economic preparation method for laminated composite metal hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step A: Mg(OH) 2 and Al(OH) 3 by Mg 2+ / Al 3+ The molar ratio is mixed in a ratio of 3:1, and 10 g of the mixture is placed in 90 g of deionized water, and then added to the reactor;

[0030] Step B: Add 1.27g of ammonium bicarbonate and 10ml of ammonia water into the reactor, raise the temperature to 100°C, react for 2 hours, centrifuge the obtained product and directly dry it at 70°C for 8 hours to obtain the molecular formula Mg 6 Al 2 (OH) 12 CO 3 4H 2 LDHs product of O, namely MgAl-CO 3 -LDHs.

[0031] The crystal structure of the sample was characterized by XRD-6000 X-ray powder diffractometer from Shimadzu Corporation, Japan. figure 1 It is the XRD spectrogram of the sample obtained in Example 1. As can be seen from the figure, the 003, 006 and 009 crystal plane diffraction peaks reflecting the layered structure appear at 2θ=11.7°, 23.4° and 34.5° respectively. The peak shape of the diffraction peak is sharp, the baseline is low and flat, and no impurit...

Embodiment 2

[0034] Step A: Zn(OH) 2 , Mg(OH) 2 and Al(OH) 3 Press Zn 2+ : Mg 2+ : Al 3+ The molar ratio is mixed in a ratio of 1:3:2, and 15g of the mixture is placed in 80g of deionized water, and then added to the reactor;

[0035] Step B: Add 1.27g of ammonium bicarbonate and 20ml of ammonia water into the reactor, raise the temperature to 200°C, react for 1 hour, centrifuge the obtained product and directly dry it at 70°C for 8 hours to obtain the molecular formula ZnMg 3 Al 2 (OH) 12 CO 3 4H 2 O's LDHs products.

Embodiment 3

[0037] Step A: Ca(OH) 2 and Al(OH) 3 Press Ca 2+ : Al 3+ The molar ratio is mixed in a ratio of 3:1, and 20 g of the mixture is placed in 80 g of deionized water, and then added to the reactor;

[0038] Step B: Add 1.27g of ammonium bicarbonate and 30ml of ammonia water into the reactor, raise the temperature to 200°C, react for 1 hour, centrifuge the obtained product, and directly dry at 70°C for 8 hours to obtain the molecular formula Ca 4 Al 2 (OH) 12 CO 3 4H 2 O's LDHs products.

[0039] The elemental content of the samples was analyzed by a Shimadzu ICPS-7500 elemental analyzer. Elemental analysis shows that the sample prepared in Example 3 shows that Ca in the product: Al=3: 1, and does not contain Na in the product + and other hetero ions.

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Abstract

The invention discloses an atom economic preparation method for laminated composite metal hydroxide, and belongs to the technical filed of the preparation of inorganic non-metal functional materials. In the method, the laminated composite metal hydroxide is prepared from metal hydroxide, ammonium salt and ammonia water serving as raw materials through atom economical reaction in a reactor. Due to the adoption of the ammonium salt and the ammonia water in the reaction process, the reaction temperature is reduced and the reaction condition is milder and is controlled easily; the ammonium in the ammonium salt and the ammonia water used in the reaction can be recycled in the post-treatment; the metal hydroxide and the corresponding ammonium salt with negative ion An- are used in the reaction, and other raw materials such as NaOH and the like are not used; and all the raw materials take part in the reaction to generate the target product and the atom economy is 100 percent, so the reaction belongs to the typical atom economic reaction. In the production process, side products are not generated, and the product can be dried to form pure product without washing so as to greatly save water resource and protect the environment.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic functional materials, in particular to an atom-economic preparation method of layered composite metal hydroxides. Background technique [0002] Layered double hydroxides (LDHs for short), also known as hydrotalcite, is a typical anionic layered material, and its chemical composition formula is [M 2+ 1 -xM 3+ x (OH) 2 ]A n- x / n mH 2 O, where M 2+ , M 3+ is a metal cation, A n- is an interlayer anion, x is M 3+ The mole fraction of ions, m is the number of crystal water. The element types and composition ratios of the main laminates of LDHs, and the types and quantities of interlayer objects can be adjusted in a wide range according to needs, so as to obtain materials with special structures and properties. The adjustable composition and structure of LDHs and the resulting multifunctionality make them a class of new materials with great research potential an...

Claims

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Application Information

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IPC IPC(8): C01B13/14
Inventor 徐向宇陈秋华宋家庆林彦军
Owner 临沂万新海纳材料科技有限公司
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