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Method for preparing mesoporous Alpha-Fe2O3/Alpha-Al2O3 and magnetic mesoporous Gamma-Fe2O3/Alpha-Al2O3 nanoscale composite materials under low-temperature condition

A nanocomposite material, low temperature technology, applied in the field of inorganic nanomaterials, can solve the problems of uneven particle size, difficult preparation, complicated process, etc., and achieve the effects of uniform pore size distribution, simple operation and low cost

Inactive Publication Date: 2017-10-20
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] α-Al so far 2 o 3 The preparation temperature is above 1000°C, and the higher preparation temperature makes nano-α-Al 2 o 3 It becomes more difficult to prepare
At the same time, these methods also have the disadvantages of easy introduction of impurities, uneven particle size, complicated process, and high cost.

Method used

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  • Method for preparing mesoporous Alpha-Fe2O3/Alpha-Al2O3 and magnetic mesoporous Gamma-Fe2O3/Alpha-Al2O3 nanoscale composite materials under low-temperature condition
  • Method for preparing mesoporous Alpha-Fe2O3/Alpha-Al2O3 and magnetic mesoporous Gamma-Fe2O3/Alpha-Al2O3 nanoscale composite materials under low-temperature condition
  • Method for preparing mesoporous Alpha-Fe2O3/Alpha-Al2O3 and magnetic mesoporous Gamma-Fe2O3/Alpha-Al2O3 nanoscale composite materials under low-temperature condition

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This embodiment provides a mesoporous α-Fe under low temperature conditions 2 o 3 / α-Al 2 o 3 and magnetic mesoporous γ-Fe 2 o 3 / α-Al 2 o 3 A method for preparing a nanocomposite material, comprising the steps of:

[0031] a. A certain amount of aluminum nitrate nonahydrate is dissolved in deionized water;

[0032] b. At 70°C, add ammonium carbonate solution under the condition of stirring, control the volume of ammonium carbonate, so that the amount of ammonium carbonate is 1.5 times the sum of the amount of aluminum ions; the gel is obtained through reaction;

[0033] c. Aging the gel formed after titration at a constant temperature of 30°C for 24 hours, then transferring to an oven and drying at 100°C for 12 hours;

[0034] d. Calcining the dried gel at 800°C for 10 hours at a heating rate of 2°C / min to prepare mesoporous γ-Al 2 o 3 Complex;

[0035] With the product of this example, carry out XRD collection of patterns to measure, and N 2 Determination ...

Embodiment 2

[0037] This embodiment provides a mesoporous α-Fe under low temperature conditions 2 o 3 / α-Al 2 o 3 and magnetic mesoporous γ-Fe 2 o 3 / α-Al 2 o 3 A method for preparing a nanocomposite material, comprising the steps of:

[0038] a. a certain amount of aluminum nitrate nonahydrate and ferric nitrate nonahydrate are dissolved in deionized water; the final obtained Fe 2 o 3 The mass of Fe 2 o 3 and Al 2 o 3 5% of the total mass;

[0039] b. At 70°C, add ammonium carbonate solution under stirring conditions, control the volume of ammonium carbonate, so that the amount of ammonium carbonate is 1.5 times the sum of the amount of iron and aluminum ions; the gel is obtained through reaction;

[0040] c. Aging the gel formed after titration at a constant temperature of 30°C for 24 hours, then transferring to an oven and drying at 100°C for 12 hours;

[0041] d. Calcining the dried gel at 800°C for 10 hours at a heating rate of 2°C / min to prepare mesoporous α-Fe 2 o 3 ...

Embodiment 3

[0045] This embodiment provides a mesoporous α-Fe under low temperature conditions 2 o 3 / α-Al 2 o 3 and magnetic mesoporous γ-Fe 2 o 3 / α-Al 2 o 3 A method for preparing a nanocomposite material, comprising the steps of:

[0046] a. a certain amount of aluminum nitrate nonahydrate and ferric nitrate nonahydrate are dissolved in deionized water, so that the final obtained Fe 2 o 3 The mass of Fe 2 o 3 and Al 2 o 3 10% of the total mass;

[0047] b. At 70°C, add ammonium carbonate solution under stirring conditions, control the volume of ammonium carbonate, so that the amount of ammonium carbonate is 1.5 times the sum of the amount of iron and aluminum ions; the gel is obtained through reaction;

[0048] c. Aging the gel formed after titration at a constant temperature of 30°C for 24 hours, then transferring to an oven and drying at 100°C for 12 hours;

[0049] d. Calcining the dried gel at 800°C for 10 hours at a heating rate of 2°C / min to prepare mesoporous α-Fe...

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Abstract

The invention discloses a method for preparing mesoporous Alpha-Fe2O3 / Alpha-Al2O3 and magnetic mesoporous Gamma-Fe2O3 / Alpha-Al2O3 nanoscale composite materials under a low-temperature condition. By a soluble aluminium salt and ferric salt hydrolysis method, aluminium hydroxide and ferric hydroxide sol are prepared, and the sol is then dried to remove free water, so that corresponding aluminium hydroxide and ferric hydroxide xerogel is obtained; moisture in molecules is lost by calcination, so that the mesoporous Alpha-Fe2O3 / Alpha-Al2O3 nanoscale composite material is obtained, and then by reduction, the magnetic mesoporous Gamma-Fe2O3 / Alpha-Al2O3 nanoscale composite material is obtained. The grain size of the nanoscale Alpha-Al2O3 particles prepared by the method under 800 DEG C is about 50nm, and as an initial material for the preparation of alumina ceramic and a doping component for the preparation of composite materials and coating materials, the mesoporous Alpha-Fe2O3 / Alpha-Al2O3 and magnetic mesoporous Gamma-Fe2O3 / Alpha-Al2O3 nanoscale composite materials are of great significance.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanomaterials, and more specifically relates to a mesoporous α-Fe 2 o 3 / α-Al 2 o 3 and magnetic mesoporous γ-Fe 2 o 3 / α-Al 2 o 3 Preparation methods of nanocomposites. Background technique [0002] According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), porous materials can be divided into three types of pores according to their pore size: microporous materials with a pore size of less than 2 nm; mesoporous materials with a pore size of 2-50 nm; hole material. Due to the characteristics of large specific surface area, uniform pore size distribution, and adjustable pore size, mesoporous materials have important applications in adsorption, separation, and especially catalytic reactions. Mesoporous materials and magnetic γ-Fe 2 o 3 and Fe 3 o 4 Composite materials with magnetic properties have become a research hotspot in the field of catalysis b...

Claims

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Application Information

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IPC IPC(8): C01G49/06C01F7/02H01F1/01B82Y30/00
CPCC01G49/06B82Y30/00C01F7/02C01P2002/72C01P2004/82C01P2006/12C01P2006/14C01P2006/16H01F1/0045H01F1/01
Inventor 邹秀晶魏宁汪学广鲁雄刚尚兴付
Owner SHANGHAI UNIV
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