Preparation method for aluminum oxide nano-particles

A technology of alumina nano and aluminum hydroxide, which is applied in the direction of alumina/hydroxide preparation, nanotechnology, nanotechnology, etc., can solve the problems of large particle size of alumina nanoparticles, environmental pollution, etc., and reach the particle size distribution range The effect of narrow, environment-friendly and simple process

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The raw materials used in this method contain elements such as nitrogen and chlorine, which are likely to cause

Method used

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  • Preparation method for aluminum oxide nano-particles
  • Preparation method for aluminum oxide nano-particles
  • Preparation method for aluminum oxide nano-particles

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Measure 100mL of 1M aluminum chloride solution and place it in a beaker, add 1M sodium hydroxide solution drop by drop to the beaker under magnetic stirring to make the pH of the final slurry 7; add 1.8 grams of Sorbitol; then the beaker is placed in ultrasonic equipment for ultrasonic treatment, the ultrasonic frequency is 50KHz, the ultrasonic power is 600W, the ultrasonic power density is 1500W / L, and the treatment time is 0.5 hour; Heat treatment in sealed water at 150°C for 3 days; after natural cooling, filter the precipitate, wash with distilled water until there is no impurity ion, dry at 110°C for 8 hours, and roast at 550°C for 4 hours to obtain the alumina nanoparticles of the present invention. The particle size distribution range of the obtained alumina nanoparticles is 5-8nm, the average particle size is 6nm, and it is characterized by powder X-ray diffraction as γ-Al 2 o 3 .

Embodiment 2

[0024] The same as Example 1, except that the aluminum salt is aluminum nitrate, the precipitating agent is ammonia water, and the pH value of the final slurry is 8 during precipitation; the added polyols are xylitol and arabitol with a mass ratio of 1:1, and the addition of polyols The amount is 6.8 grams; the temperature of the hydrothermal treatment is 200° C., and the treatment time is 1 day to obtain the alumina nanoparticles of the present invention. The particle size distribution range of the obtained alumina nanoparticles is 7-12nm, the average particle size is 10nm, and it is characterized by powder X-ray diffraction as γ-Al 2 o 3 .

Embodiment 3

[0026] Same as Example 1, except that the aluminum salt is aluminum sulfate, the precipitating agent is sodium hydroxide, and the pH value of the final slurry during precipitation is 5; the added polyhydric alcohol is ethylene glycol, glycerol and The addition of mannitol and polyols is 3.36 grams; the frequency of ultrasonic treatment is 80KHz, the ultrasonic power density is 1000W / L, and the treatment time is 1.5 hours; the temperature of hydrothermal treatment is 230°C, and the treatment time is 5 days. Invention of alumina nanoparticles. The particle size distribution range of the obtained alumina nanoparticles is 5-11nm, the average particle size is 7nm, and it is characterized by powder X-ray diffraction as γ-Al 2 o 3 .

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Abstract

The invention discloses a preparation method for aluminum oxide nano-particles. The preparation method comprises the following steps: (1) dripping precipitant solution into aluminum salt solution under a stirring condition to generate aluminum hydroxide precipitation; controlling the adding amount of the precipitant to enable the pH value of a system to be 5-10 finally to obtain aluminum hydroxide precipitation slurry; (2) adding polyatomic alcohol in the precipitation slurry in the step (1); then transferring the slurry into a high-pressure reactor; sealing the high-pressure reactor for hydro-thermal treatment; filtering, washing, drying and roasting the precipitation after the hydro-thermal treatment to prepare the aluminum oxide nano-particles. The method is simple in process, and environmental-friendly; the prepared aluminum oxide nano-particles are uniform in particle diameter, and have wide application prospect in the fields of chemical engineering catalysis, ceramic, paint, and the like.

Description

technical field [0001] The invention relates to a method for preparing aluminum oxide nanoparticles, in particular to a method for preparing aluminum oxide nanoparticles with an average particle diameter of 5-10 nm. Background technique [0002] Nanomaterials have many new features that traditional materials do not have. The characteristics of nanomaterials in terms of structure, photoelectricity and chemical properties have aroused strong interest of researchers in the fields of physics, materials and chemistry. In recent years, nanotechnology has been greatly favored by countries all over the world, especially developed countries. Nano-alumina is a kind of ultrafine particles with a particle size of 1-100 nanometers. It has strong volume effect, quantum size effect, surface effect and macroscopic quantum tunneling effect. It is widely used in fine ceramics, composite materials, fluorescent materials, moisture sensitive Sex sensors, infrared absorbing materials and catalyt...

Claims

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Application Information

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IPC IPC(8): C01F7/30B82Y30/00
Inventor 季洪海沈智奇凌凤香王少军杨卫亚王丽华郭长友
Owner CHINA PETROLEUM & CHEM CORP
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