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Preparation method of nanometer fiber type thin diaspore

A technology of boehmite and nanofibers, which is applied in the field of nanomaterial preparation, can solve the problems of agglomeration, uncontrollable pore volume, and low specific surface area, and achieve the effects of uniform particle size, prevention of aggregation and growth, and uniform particle size

Active Publication Date: 2015-11-11
黄志强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanomaterials prepared by hydrothermal method have the characteristics of low cost, high crystallinity, controllable crystal form, and high purity, but there are still problems of agglomeration, uncontrollable pore volume, and low specific surface area.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of nanofibrous boehmite, comprising the following steps:

[0035] Step 1, take a certain amount of aluminum nitrate, be dissolved in deionized water and be mixed with the aluminum nitrate solution that concentration is 0.5mol / L;

[0036] Step 2. At a stirring speed of 500-800r / min, add 5mol / L sodium hydroxide dropwise to 100mL aluminum nitrate solution at a rate of 1-3mL / min until the pH value of the solution is 7.5. After the addition, continue to stir at room temperature at a stirring speed of 1200r / min for 20min to obtain a white suspension;

[0037] Step 3: Ultrasonic treatment at a frequency of 180-200 kHz is performed on the white suspension for 1-2 minutes, and the white suspension after ultrasonic treatment is aged at a temperature of 30-40° C. and a stirring speed of 300 r / min for 1 hour. A white precipitate is obtained;

[0038] Step 4, adding the white precipitate into the aqueous solution of polyethylene oxide, and stirring at a stirri...

Embodiment 2

[0043] A preparation method of nanofibrous boehmite, comprising the following steps:

[0044] Step 1, take a certain amount of aluminum nitrate, be dissolved in deionized water and be mixed with the aluminum nitrate solution that concentration is 0.7mol / L;

[0045] Step 2, at a stirring speed of 500-800r / min, dropwise add 5mol / L of sodium hydroxide to 100mL of the aluminum nitrate solution at a rate of 1-3mL / min until the pH of the solution is 9.5, After the dropwise addition, continue stirring at room temperature at a stirring speed of 1200r / min for 40min to obtain a white suspension;

[0046] Step 3: Ultrasonic treatment of the white suspension at a frequency of 180-200kHz for 2 minutes, aging the white suspension at a temperature of 30-40°C and a stirring speed of 300r / min for 5 hours to obtain white precipitate;

[0047] Step 4. Add the white precipitate to the aqueous solution of polyethylene oxide, and stir at room temperature for 60 min at a stirring speed of 300 r / mi...

Embodiment 3

[0052] A preparation method of nanofibrous boehmite, comprising the following steps:

[0053] Step 1, take a certain amount of aluminum nitrate, be dissolved in deionized water and be mixed with the aluminum nitrate solution that concentration is 0.6mol / L;

[0054] Step 2, at a stirring speed of 500-800 r / min, dropwise add 5 mol / L of sodium hydroxide to 100 mL of the aluminum nitrate solution at a rate of 1-3 mL / min until the pH of the solution is 8.0, After the dropwise addition, continue stirring for 30 min at room temperature at a stirring speed of 1200 r / min to obtain a white suspension;

[0055] Step 3: Ultrasonic treatment of the white suspension at a frequency of 180-200 kHz, ultrasonic treatment for 1-2 minutes, aging of the white suspension at a temperature of 30-40° C. and a stirring speed of 300 r / min for 3 hours to obtain white precipitate;

[0056] Step 4, adding the white precipitate into the aqueous solution of polyethylene oxide, and stirring at room temperat...

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Abstract

The invention provides a preparation method of nanometer fiber type thin diaspore. The method comprises the following steps of preparing an aluminum nitrate solution with the concentration being 0.5 to 0.7mol / L; 2, dripping sodium hydroxide into the aluminum nitrate solution at a dripping speed being 1 to 3ml / min until the pH value of the solution is 7.5 to 9.5; after the dripping is completed, continuously stirring the materials for 20 to 40min to obtain white suspension; 3, performing ultrasonic wave processing on the white suspension, and then performing aging to obtain white precipitates; 4, adding the white precipitates into a polyoxyethylene water solution; stirring the materials at a stirring speed of 300r / min at room temperature for 60min to obtain a mixture; 5, putting the mixture at 70 to 90 DEG C for crystallization for 6 to 10h to obtain precursors; 6, cooling the precursors to the room temperature, then, performing filtering and washing; drying the filtered precursors to obtain the nanometer fiber type thin diaspore. The nanometer fiber type thin diaspore prepared by the method has the advantages that the particle size is more uniform; in addition, the agglomeration problem is also solved; the specific surface area is 400 to 500 m<2> / g; and the particle diameter is uniform and is 3 to 5nm.

Description

technical field [0001] The invention relates to a preparation method of nanomaterials. More specifically, the present invention relates to a preparation method of nanofibrous boehmite. Background technique [0002] The unique properties of nanoparticles make them have broad realistic and potential application prospects in catalysts, functional materials, composite materials, optical materials and ceramic materials. For example, nanoparticles have high specific surface area and high surface activity, and their use in catalytic materials has remarkable catalytic efficiency. [0003] Boehmite (α-Al 2 o 3 ·H 2 O) It can also be called boehmite or boehmite, which belongs to the orthorhombic crystal system, and has various shapes and shapes. Boehmite often exists together with gibbsite and diaspore, etc., and its use is the same as them. High-purity boehmite has a large pore volume and large pore diameter, and is a high-quality petrochemical catalyst carrier material. [00...

Claims

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Application Information

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IPC IPC(8): C01F7/00
Inventor 黄志强
Owner 黄志强