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Method for preparing cerium oxide rhombus nano sheet-shaped material

A nano-sheet and diamond-shaped technology, which is applied in the direction of nanostructure manufacturing, chemical instruments and methods, nanotechnology, etc., can solve the problems of poor repeatability, harsh operating conditions, and high pressure of hydrothermal methods, and achieve convenient operation, simple equipment, and advanced technology. stable effect

Active Publication Date: 2008-09-17
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrothermal method has poor repeatability, harsh operating conditions, high temperature and high pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Add 0.04g of cerous nitrate hydrate to 40mL of water, add 0.03g of polyethylene glycol (PEG) and 0.1g of urea, ultrasonicate the solution for 20-30min, transfer it to a flask, and stir and reflux at 100°C 1h, after cooling, discard the supernatant, add deionized water to dilute, filter with suction, wash until neutral, dry at 60°C, and calcined at 600°C for 2h to obtain CeO 2 rhombohedral nanosheets. The calcined product is pale yellow.

Embodiment 2

[0017] Embodiment two: 0.5g cerous nitrate hydrate is added in the mixed solvent of 40mL dimethylformamide (DMF) / water (volume ratio is 1: 1), after adding 0.3g hexadecyl trimethyl bromide ammonium (CTAB) and 2g urotropine, ultrasonically transfer this solution for 20-30min to a flask, stir and reflux at 120°C for 10h, discard the supernatant after cooling, dilute with deionized water, filter with suction, and wash until Neutral, dry at 60°C, calcined at 500°C for 4h to get CeO 2 rhombohedral nanosheets. The calcined product is pale yellow.

Embodiment 3

[0018] Embodiment three: 4.5g hydrated cerous nitrate is joined in 40mL dimethyl formaldehyde amine (DMF), adding 3.5g cetyltrimethylammonium bromide (CTAB) and 12g urea, this solution ultrasonic 20 -30min, transferred to a flask, stirred and refluxed at 140°C for 1h, discarded the supernatant after cooling, diluted with deionized water, filtered with suction, washed to neutral, dried at 60°C, and calcined at 600°C for 2h to obtain CeO 2 rhombohedral nanosheets. The calcined product is pale yellow.

[0019] The products obtained in the above examples were observed by a scanning electron microscope (SEM), and the ceria was in the form of rhombic nano-sheet microcrystalline structure, and the distribution was uniform.

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PUM

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Abstract

The invention relates to a preparation method for cerium oxide rhombus nanometer sheet material, belonging to the technical field of preparation process for the inorganic nanometer material. The preparation method is characterized in that by using heating backflow method, three-valent cerium nitrate is organic or inorganic solvent in which surfactant and precipitant exist, then the solution goes through ultrasonic dispersion for 20 to 30 minutes, and enters heating backflow reaction process; the temperature for the heating backflow reaction is 90 to 140 DEG C, and the reaction time lasts 2 to 10 hours; subsequently, suction filtering or centrifugal separation is conducted, the resultant precipitate is washed to be neutral, then washed by alcohol, and dried under 60 DEG C; next, the precipitate is calcined under the temperature of 400 to 600 DEG C for 2 to 6 hours, finally, the CeO2 rhombus nanometer sheet microcrystal material is obtained. Furthermore, the acquired CeO2 material enjoys tremendous potential application prospects in the fields of shielding ultraviolet light and automobile exhaust catalysis.

Description

technical field [0001] The invention relates to a method for preparing a cerium oxide rhombic nano sheet material, which belongs to the technical field of inorganic nano material preparation technology. Background technique [0002] my country is rich in rare earth resources. Due to the special electron arrangement of rare earth elements, it has many potential application prospects in optics and electronics. CeO 2 As a very important rare earth oxide, it has broad development prospects in the fields of automobile exhaust purification, chemical mechanical polishing, and fuel cells. while CeO 2 Compared with bulk materials, nanomaterials have greatly improved in structure and performance, and have some new physical and chemical properties due to the nano-size effect. Therefore, CeO 2 The study of nanostructures has received widespread attention. [0003] Currently, CeO 2 The preparation methods of nanomaterials mainly include template method, solvothermal method, precipi...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82B3/00
Inventor 张登松施利毅黄雷张剑平
Owner SHANGHAI UNIV
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