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A method for preparing porous alumina composite materials by biological template method

A porous alumina, biological template technology, used in chemical instruments and methods, physical/chemical process catalysts, other chemical processes, etc., can solve problems in the initial research stage, and achieve the effect of wide sources and increased specific surface area

Inactive Publication Date: 2015-10-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many biological materials have been used as templates to synthesize porous materials with inorganic structures. These biological templates include bones, deer antlers, horns, feathers, hairs, insect wings, bacteria, fungi, viruses, plant fibers, plant leaves, pollen grains , shell membrane, spider silk fiber and silk, etc., but these biomimetic materials are mainly the precise replication of biological structures, and based on the replicated biomorphic materials, the preparation of new structural materials is still in the initial research stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 2 g of Ginkgo biloba was selected as the biological template, and the Ginkgo biloba was washed 3 times in 100 mL of absolute ethanol. Add the cleaned ginkgo leaves to 100mL of 6wt% hydrochloric acid solution, soak for 6h, take out and wash with distilled water for 3 times, then soak the ginkgo leaves again in 100mL of 6wt% fresh hydrochloric acid solution, immerse for 12h, filter, wash with distilled water Wash until the pH of the filtrate is neutral, and dry at 80° C. for 12 hours to obtain a pretreated ginkgo leaf template.

[0019] Take 200mL of aluminum nitrate solution with a concentration of 0.1mol / L, soak 0.5g of pretreated ginkgo leaves in the aluminum nitrate solution, take it out after 4h of immersion time, wash with distilled water 3 times, dry at 80°C for 12h, and dry at 500-800°C Calcined for 4 hours to obtain biomorphic alumina.

[0020] Add 0.001 mol of biomorphic alumina and 0.004 mol of hexamethylenetetramine into 30 mL of magnesium nitrate solution wi...

Embodiment 2

[0022] 3 g of poplar leaves were selected as the biological template, and the poplar leaves were washed 3 times in 100 mL of absolute ethanol. Add the cleaned poplar leaves to 100mL of 6wt% hydrochloric acid solution, soak for 6h, take out the distilled water and wash 3 times, then immerse the poplar leaves in 100mL of 6wt% fresh hydrochloric acid solution, soak for 12h, filter, and wash with distilled water Until the pH of the filtrate is neutral, dry at 80° C. for 12 hours to obtain the pretreated poplar leaf template.

[0023] Take 200mL of aluminum nitrate solution with a concentration of 0.1mol / L, immerse 1g of the pretreated poplar leaves in the aluminum nitrate solution, take out after 4h of immersion time, wash with distilled water for 3 times, dry at 80°C for 12h, and roast at 500-800°C 4h to obtain biomorphic alumina.

[0024] Add 0.001 mol of biomorphic alumina and 0.004 mol of hexamethylenetetramine into 30 mL of magnesium nitrate solution with a concentration of ...

Embodiment 3

[0026] 2 g of Ginkgo biloba was selected as the biological template, and the Ginkgo biloba was washed 3 times in 100 mL of absolute ethanol. Add the cleaned ginkgo leaves to 100mL of 6wt% hydrochloric acid solution, soak for 6h, take out the distilled water and wash 3 times, then soak the ginkgo leaves again in 100mL of 6wt% fresh hydrochloric acid solution, soak for 12h, filter, and wash with distilled water Until the pH of the filtrate is neutral, dry at 80° C. for 12 hours to obtain the pretreated ginkgo leaf template.

[0027] Take 200mL of aluminum sulfate solution with a concentration of 0.1mol / L, immerse 1g of pretreated ginkgo leaves in the aluminum nitrate solution, take it out after 4h of immersion time, wash with distilled water for 3 times, dry at 80°C for 12h, and roast at 500-800°C 4h to obtain biomorphic alumina.

[0028] Add 0.001 mol of biomorphic alumina and 0.004 mol of hexamethylenetetramine to 30 mL of magnesium nitrate solution with a concentration of 0....

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Abstract

The invention relates to a method for preparing a porous alumina composite material through a biological template method. The method comprises the following steps: duplicating a macro-pore tubular structure of a plant leaf, which is used as a biological template, through alumina in a material preparation process to obtain biomorphic alumina with a macro-pore fiber tubular structure; growing an LDHs (layered double hydroxides) nanosheet in a macro-pore channel of the biomorphic alumina in situ through an in-situ growth technology to obtain a porous LDHs / alumina composite material; roasting the porous LDHs / alumina composite material at the temperature of 500-800 DEG C to obtain the porous alumina composite material. The LDHs nanosheet is grown in the macro-pore channel of the biomorphic alumina, so that the specific surface area of the biomorphic alumina can be remarkably increased, and the pore structure of the biomorphic alumina is diversified. The porous alumina composite material can be widely applied to the fields of adsorption, catalysis and the like.

Description

technical field [0001] The invention relates to a method for preparing a porous alumina composite material by a biological template method, and belongs to the technical field of preparation of porous materials. Background technique [0002] After a long period of natural selection and evolution, most organisms have finely graded structures and special functions. The preparation of biomorphic materials with fine structures using bionic technology is a hot and difficult research topic in the field of functional materials. Biomimetic synthesis mainly uses biological materials to induce the formation of inorganic materials, and controls the morphology of inorganic materials by replicating the structure of biological materials. At present, many biological materials have been used as templates to synthesize porous materials with inorganic structures. These biological templates include bones, deer antlers, horns, feathers, hairs, insect wings, bacteria, fungi, viruses, plant fibers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/08B01J20/30B01J21/04
Inventor 周钰明张涛王泳娟卜小海张牧阳梅震宇胡金刚
Owner SOUTHEAST UNIV
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