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Preparation method and application of rare earth yttrium-doped alumina nano-material

An alumina nano and yttrium doping technology is applied in the field of preparation of rare earth yttrium doped alumina nano materials, can solve problems such as lack of research on the addition method, and achieve the effects of excellent thermal stability, uniform crystal pore size and uniform doping

Active Publication Date: 2015-11-18
朱新洁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Studies have found that adding impurity elements can improve the thermal stability of activated alumina. The additives used to improve the thermal stability of alumina are generally rare earth metal oxides, alkaline earth metal oxides, etc., and the effect is significant. Currently, the thermal stability of alumina is improved. For stability, impregnation (additives) is often used, that is, the surface of alumina is modified to increase the stability of alumina, and there is a lack of research on other addition methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of rare earth yttrium-doped alumina nanomaterials, comprising the following steps:

[0041] Step 1, preparation concentration is the aluminum sulfate solution of 0.2mol / L;

[0042] Step 2. According to the ratio of 2:1 according to the amount of sodium / aluminum, sodium hydroxide and solid aluminum hydroxide are weighed in the inner bag of the autoclave, and then water is added to 100g, and the inner container of the autoclave is Put the gallbladder in a high-pressure reactor at 70°C for 2h at a speed of 30-50r / min, then stand at 150°C for 2h to obtain a sodium metaaluminate solution;

[0043] Step 3. Add the sodium metaaluminate solution dropwise to the aluminum sulfate solution at a rate of 1 drop / second at a stirring speed of 800-1300 r / min until the pH value is 8.0 to obtain a suspension; When the pH value is not greater than 6.0, the stirring speed is 800-1000r / min; when the pH value is greater than 6.0, the stirring speed is 1000-1300r / min;

...

Embodiment 2

[0052] A preparation method of rare earth yttrium-doped alumina nanomaterials, comprising the following steps:

[0053] Step 1, preparation concentration is the aluminum sulfate solution of 0.7mol / L;

[0054] Step 2. According to the ratio of 8:1 according to the amount of sodium / aluminum, sodium hydroxide and solid aluminum hydroxide are weighed in the inner bag of the autoclave, and then water is added to 100g, and the inner container of the autoclave is Put the gallbladder in a high-pressure reactor at 120°C for 2 hours at a speed of 30-50r / min, and then stand at 180°C for 2 hours to obtain a sodium metaaluminate solution;

[0055] Step 3. Add the sodium metaaluminate solution dropwise to the aluminum sulfate solution at a rate of 3 drops / second at a stirring speed of 800-1300 r / min until the pH value is 10.0 to obtain a suspension; When the pH value is not greater than 6.0, the stirring speed is 800-1000r / min; when the pH value is greater than 6.0, the stirring speed is 1...

Embodiment 3

[0064] A preparation method of rare earth yttrium-doped alumina nanomaterials, comprising the following steps:

[0065] Step 1, preparing an aluminum sulfate solution with a concentration of 0.2 to 0.7 mol / L;

[0066] Step 2. According to the ratio of 2:1 to 8:1 in the amount of sodium / aluminum, weigh sodium hydroxide and solid aluminum hydroxide in the inner tank of the autoclave, then add water to 100g, and put the high-pressure The liner of the reaction kettle is placed in a high-pressure reaction kettle at 70-120°C for 2 hours at a speed of 30-50r / min, and then left at 150-180°C for 2 hours to obtain a sodium metaaluminate solution;

[0067] Step 3. Add the sodium metaaluminate solution dropwise to the aluminum sulfate solution at a rate of 1-3 drops / second at a stirring speed of 800-1300 r / min until the pH value is 8.0-10.0, A suspension is obtained; when the pH value is not greater than 6.0, the stirring speed is 800-1000 r / min; when the pH value is greater than 6.0, th...

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Abstract

The invention provides a preparation method and application of a rare earth yttrium-doped alumina nano-material. The preparation method comprises the following steps: 1, preparing an aluminium sulfate solution; 2, preparing a sodium metaaluminate solution; 3, dripping the sodium metaaluminate solution into the aluminium sulfate solution to obtain a suspension; 4, ageing the suspension to obtain a white sediment; 5, washing the white sediment; 6, adding the washed white sediment and cetyl trimethyl ammonium bromide into water to obtain a mixed solution; 7, adding rare-earth yttrium nitrate into the mixed solution to obtain a rare-earth mixed solution; 8, performing static crystallization on the rare-earth mixed solution, and then drying to obtain a precursor of a rare earth yttrium-doped alumina nano-material; 9, calcining to obtain the rare earth yttrium-doped alumina nano-material which is used for adsorbing arsenic in water. The prepared rare earth yttrium-doped alumina nano-material has the properties of being uniform in doping and crystal aperture, can be used for adsorbing arsenic in water and has a favorable application prospect.

Description

technical field [0001] The invention relates to a preparation method of a rare earth-doped alumina nanometer material. More specifically, the present invention relates to a preparation method of rare earth yttrium-doped alumina nanometer material. 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] It is well known that alumina undergoes a series of phase transitions during the calcination process, and finally a stable phase of alumina (α-Al 2 o 3 ), wherein the crystal form of the intermediate state is the transition state alumina, and the γ-Al in the transition state alumina 2 o 3 and δ-Al 2 o 3 Because of its large speci...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/30C02F1/28C02F1/58
Inventor 黄志强
Owner 朱新洁
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