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Method for synthesizing CeO2 nano spherical particles by a molten salt method

A technology of spherical particles and synthesis methods, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as low uniformity of shape, poor dispersion, and poor size controllability

Inactive Publication Date: 2020-05-05
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the deficiencies in the prior art, to provide a CeO 2 The molten salt synthesis method of nano-spherical particles has a simple preparation process and is easy to prepare on a large scale. At the same time, it can solve the problems of poor size controllability, low uniformity of shape, and poor dispersion of products prepared by existing methods.

Method used

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  • Method for synthesizing CeO2 nano spherical particles by a molten salt method
  • Method for synthesizing CeO2 nano spherical particles by a molten salt method
  • Method for synthesizing CeO2 nano spherical particles by a molten salt method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Ce(NO 3 ) 3 , KCl and LiCl were mixed in a ratio of 2:50:30, and ground with an agate mortar to obtain a uniformly mixed solid mixture; the obtained mixture was collected in an alumina crucible and then put into a muffle furnace, and pressed The temperature was raised to 540°C at a rate of 5°C / min, roasted for 4 h, and cooled naturally; the reacted product was soaked in deionized water to desalinate, and filtered with suction to obtain a yellow solid; the obtained yellow solid was taken out to a centrifuge tube and used to Centrifuged and washed several times with deionized water, dried in vacuum at 60°C to obtain yellow CeO 2 nanoparticles.

[0027] XRD test results show that the product is pure phase CeO 2 compound ( figure 1 ), the results of scanning electron microscopy showed that ( figure 2 ), the synthesized CeO 2 The nanoparticle samples have uniform morphology and good dispersion, with diameters ranging from 60 to 100 nm.

Embodiment 2

[0029] Will Ce 2 (CO 3 ) 3 , KCl and LiCl were mixed in a ratio of 2:50:30, and ground with an agate mortar to obtain a uniformly mixed solid mixture; the obtained mixture was collected in an alumina crucible and then put into a muffle furnace, and pressed The temperature was raised to 660°C at a rate of 5°C / min, roasted for 4 h, and cooled naturally; the reacted product was soaked in deionized water to desalinate, and filtered with suction to obtain a yellow solid; the obtained yellow solid was taken out to a centrifuge tube and used to Centrifuged and washed several times with deionized water, dried in vacuum at 60°C to obtain yellow CeO 2 nanoparticles.

[0030] image 3 It is the CeO prepared in this example 2 Scanning electron micrograph of the sample, it can be seen that the synthesized product CeO 2 It is a spherical nanoparticle with a diameter of 100-400 nm.

Embodiment 3

[0032] Will Ce 2 (CO 3 ) 3 , KCl and LiCl were mixed in a ratio of 2:50:30, and ground with an agate mortar to obtain a uniformly mixed solid mixture; the obtained mixture was collected in an alumina crucible and then put into a muffle furnace, and pressed The temperature was raised to 780°C at a rate of 5°C / min, roasted for 3 h, and cooled naturally; the reacted product was soaked in deionized water to desalinate, and filtered with suction to obtain a yellow solid; the obtained yellow solid was taken out to a centrifuge tube and used to Centrifuged and washed several times with deionized water, dried in vacuum at 60°C to obtain yellow CeO 2 nanoparticles. Figure 4 It is the CeO prepared in this example 2 Scanning electron micrograph of the sample, it can be seen that the synthesized product CeO 2 It is a spherical nanoparticle with a diameter of 600-1000 nm.

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Abstract

The invention discloses a method for synthesizing CeO2 nano spherical particles by a molten salt method. The preparation method comprises the following steps: firstly, uniformly mixing trivalent cerium salt, KCl and LiCl, roasting at high temperature, dipping and desalting with distilled water, carrying out suction filtration, washing and drying to obtain the product, and the synthesized CeO2 nano-particles are spherical, have the particle size of 100-800nm, and are uniform in size and good in dispersity; the method disclosed by the invention has the characteristics of low cost, simple process, environmental friendliness, short consumed time, low energy consumption and strong controllability; the prepared product has good chemical stability and uniform morphology, the application of the CeO2 nanoparticles in the fields of electricity and catalysis is widened, and the method has a wide market application prospect.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a CeO 2 A method for synthesizing nano-spherical particles by molten salt method. Background technique [0002] CeO 2 Belong to cubic crystal system, face centered cubic structure, space group is Fm3m, CeO 2 Has a unique fluorite-type crystal structure characteristics. In CeO 2 In the unit cell of , each Ce atom is coordinated with 8 oxygen atoms, and each oxygen atom is coordinated with 4 Ce atoms. The Ce atom is located in the cubic hexahedron of the oxygen atom. This special structure makes it have oxygen ion migration characteristic. Ce 3+ / C 4+ The oxidation-reduction ability of interconversion, or the change of the valence state of the dopant ion to break the Ce 4+ The equilibrium of the valence states leads to the CeO 2 It has a strong ability to store oxygen and release oxygen. Therefore, CeO 2 It has received great attention in photocatalysis. In ...

Claims

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Application Information

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IPC IPC(8): C01F17/235B82Y30/00
CPCB82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2004/32C01P2004/62C01P2004/64
Inventor 娄正松秦佳佳郁忻烨陈丽
Owner JIANGSU UNIV OF TECH
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