Method for preparing nanoscale sheet cerium oxide by hydrothermal method

A nano-cerium oxide, hydrothermal method, applied in chemical instruments and methods, nanotechnology, nanotechnology and other directions, can solve the problems of high cost, harsh production conditions, complex production process, etc., and achieve low production cost and process conditions. Mild and controllable effect with simple preparation process

Inactive Publication Date: 2013-09-04
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, liquid phase preparation methods include precipitation method, sol-gel method, hydrothermal method and microemulsion method, etc., which can prepare cerium oxide with various shapes, but these methods generally require templates and surfactants, and have complex production processes and production problems. Disadvantages such as harsh conditions and high cost

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  • Method for preparing nanoscale sheet cerium oxide by hydrothermal method
  • Method for preparing nanoscale sheet cerium oxide by hydrothermal method
  • Method for preparing nanoscale sheet cerium oxide by hydrothermal method

Examples

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Embodiment 1

[0032] The method for preparing nano-scale flaky cerium oxide by the hydrothermal method comprises the following steps:

[0033] 1) Prepare 0.01 mol / L Ce(NO 3 ) 3 ·6H 2 O aqueous solution and ammonia aqueous solution with a pH value of 12;

[0034] 2) Put the above 9mL ammonia solution in the reaction kettle at -10℃, take 1ml of Ce 3+ Ionic aqueous solution, slowly added dropwise to the ammonia solution under stirring;

[0035] 3) The above mixed solution was reacted under stirring, and the temperature was kept at -10°C for 2 hours. After the end, the reaction solution was centrifuged to remove the upper liquid. Wash the powder obtained by centrifugation with pure water, then place it in a drying oven and dry it into a solid powder, observe with a transmission electron microscope, and find that the obtained product is a flaky cerium oxide with a thickness of 10-30nm, such as figure 1 shown.

Embodiment 2

[0037] The method for preparing nano-scale flaky cerium oxide by the hydrothermal method comprises the following steps:

[0038] 1) Prepare 0.03 mol / L CeCl at room temperature 3 aqueous solution and ammonia solution at pH 11.5;

[0039] 2) Put the above 15 mL ammonia solution in the reaction kettle at a temperature of 0°C, and take 3 ml of Ce 3+ Ionic aqueous solution, slowly added dropwise to the ammonia solution under stirring;

[0040] 3) The above mixed solution was reacted under stirring, and the temperature was kept at 0°C for 5 hours. After the end, the reaction solution was centrifuged to remove the upper liquid. The powder obtained by centrifugation was washed with pure water, and then placed in a drying oven to dry into a solid powder. Observing with a transmission electron microscope, it was found that the obtained product was flaky cerium oxide with a thickness of 10-30nm.

Embodiment 3

[0042] The method for preparing nano-scale flaky cerium oxide by the hydrothermal method comprises the following steps:

[0043] 1) Prepare 0.05 mol / L Ce(NO 3 ) 3 ·6H 2 O aqueous solution and ammonia aqueous solution with a pH value of 13;

[0044] 2) Put the above 10 mL ammonia solution in the reaction kettle at a temperature of 20 °C, and take 2 ml of Ce 3+ Ionic aqueous solution, slowly added dropwise to the ammonia solution under stirring;

[0045] 3) The above mixed solution was reacted under stirring, and reacted at a constant temperature of 20°C for 8 hours. After the end, the reaction solution was centrifuged to remove the upper liquid. The powder obtained by centrifugation was washed with pure water, and then placed in a drying oven to dry into a solid powder. Observing with a transmission electron microscope, it was found that the obtained product was flaky cerium oxide with a thickness of 10-30nm.

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Abstract

The invention discloses a method for preparing nanoscale sheet cerium oxide by a hydrothermal method. The method comprises the following steps of: 1) preparing a 0.01-0.05mol/L Ce<3+> ion aqueous liquor at room temperature; preparing an ammonia water liquor at room temperature, wherein pH value of the ammonia water liquor is greater than 11; 2) placing the ammonia water liquor in a reaction kettle in a temperature range from -10 DEG C to 20 DEG C, taking the Ce<3+> ion aqueous liquor, and slowly dropping to excessive ammonia water liquor while stirring; and 3) stirring the mixed liquor obtained in the step (2) at constant temperature for reacting for 2-24 hours, centrifugalizing after reaction, removing the supernatant liquid, washing the powder obtained by centrifugalization and drying to obtain the solid sheet cerium oxide. According to the method disclosed by the invention, the nanoscale sheet cerium oxide is synthesized by one step by the hydrothermal method. The method is simple in preparation process, and low in demand on production and process conditions. No template materials are required and no organic solvents are added. The method is basically free from pollution and very environmental-friendly.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing nanoscale flaky cerium oxide by a hydrothermal method. Background technique [0002] Nano-scale ceria has the advantages of single crystal form, good electrical and optical properties, and can be widely used. At present, its application scope extends from luminescent materials, glass polishing agents, catalysts, electronic ceramics, ultraviolet absorbers and other fields to automobile exhaust purification catalytic materials, high temperature oxygen sensitive materials, pH sensing materials, solid oxide fuel cell (SOFC) electrode materials , electrochemical reaction promotion materials, chemical mechanical polishing (CMP) abrasive materials, and metal anti-oxidation and corrosion coating materials and additives and other modern high-tech fields. Especially as a catalytic material, it has outstanding advantages in three-way catalysi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y30/00
Inventor 张国庆郭伊丽敖桔张朝霞鲁漓江
Owner ZHEJIANG SCI-TECH UNIV
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