Simple preparation method of hollow cerium oxide nano-spheres

A technology of nanospheres and cerium oxide, applied in the field of nanomaterials, can solve the problems of strict reaction conditions, cumbersome treatment process, unsatisfactory raw material cost control, etc., and achieve high applicability, low environmental pollution, and controllable reaction results adjustable effect

Inactive Publication Date: 2017-05-31
NANJING INST OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In contrast, the former treatment process is more cumbersome, and the hydrothermal method is simpler, but its raw material cost control is not satisfactory, and the reaction conditions are strict

Method used

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preparation example Construction

[0017] Such as Figure 1-2 Shown, the present invention is a kind of simple preparation method of hollow nanosphere cerium oxide, and described preparation method comprises the following steps:

[0018] (1) Weigh cerium trichloride heptahydrate and L-cysteine ​​respectively, mix them and add them to the reaction solvent water or absolute ethanol, stir evenly to obtain suspension A,

[0019] (2) Pour the uniformly stirred suspension A into the inner tank of the hydrothermal kettle, and the filling rate is 60%. After the autoclave is tightened, put it in a vacuum drying oven at 160-200°C for 3-24 hours. Get the product in the liner;

[0020] (3) After the reaction is over, stop heating and let the reactor cool down to room temperature naturally, take the product in the liner and centrifuge to remove by-products, and then wash with deionized water for 3 times and absolute ethanol for 1 time. The cerium oxide hollow nanospheres can be obtained after being dried under the sun.

...

Embodiment 1

[0024] Mix 0.3 g of cerium trichloride heptahydrate and 0.3 gL-cysteine ​​into a hot-pressed hydrothermal kettle with a capacity of 100 mL, then add 60 mL of water, and the filling rate is 60%; then the reaction kettle is sealed and Heat to 180°C for 24 hours; after the reaction, stop heating and allow the reactor to cool down to room temperature naturally; then wash the product with deionized water and absolute ethanol successively and centrifuge to remove by-products and impurities, and dry the product at 40°C After that, the cerium oxide hollow nanospheres can be obtained.

[0025] The scanning electron micrograph of gained cerium oxide hollow nanosphere is shown in figure 1 , the transmission electron microscope photo see figure 2 , it can be seen that the obtained samples are all regular spherical, and the broken nanospheres can be obtained as a hollow structure. The shell thickness of the nanospheres is about 10 nm, and the inner diameter of the hollow spheres ranges f...

Embodiment 2

[0026] Embodiment 2: The preparation method is the same as Example 1, except that the reaction time is changed from 24 hours to 12 hours.

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Abstract

The invention discloses a simple preparation method of hollow cerium oxide nano-spheres. The preparation method comprises the following steps: (1) weighing cerium trichloride heptahydrate and L-cysteine respectively, mixing, adding the mixture into water or anhydrous ethanol, and stirring uniformly to obtain a suspension A; (2) pouring the suspension A stirred uniformly into an inner container of a hydrothermal kettle, tightening the high pressure kettle, putting the hydrothermal kettle into a vacuum drying box of 160-200 DEG C, and reacting for 3-24 hours to obtain a product in the inner container; and (3) after the reaction ends, centrifuging the product in the inner container to remove byproducts, continuously washing the product three times with deionized water and one time with anhydrous ethanol, and drying the product at 40 DEG C, thus obtaining the hollow cerium oxide nano-spheres. The agent prepared by the method only contains common chemical reagents such as cerium trichloride heptahydrate, L-cysteine and deionized water, so the method is relatively low in cost, relatively high in availability and relatively low in pollution to the environment and complies with the requirement of large-scale production.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing hollow nanosphere cerium oxide. Background technique [0002] China is rich in rare earth resources, and the reserves of rare earth resources that have been surveyed occupy the first place in the world. Rare earth elements also have irreplaceable excellent properties in optics, electricity, physics and chemistry due to their unique electron layer structure, and how to effectively apply the excellent characteristics of rare earth elements to various industries has become a It is a question that many researchers are currently focusing on. Cerium oxide is an important rare earth oxide. Because of its single crystal form, excellent electrical and optical properties, etc., it is widely used in the fields of inorganic ultraviolet absorbers, fuel cell materials, alloy coatings and photocatalysis. [0003] There are many synthesis methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y30/00B82Y40/00
CPCC01F17/206C01P2002/01C01P2004/03C01P2004/34C01P2004/62C01P2004/64
Inventor 张克杰谢旺旺蔡婧黄楠
Owner NANJING INST OF TECH
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