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Preparation of cerium dioxide photocatalyst with exposed high-energy crystal face

A technology of cerium oxide and photocatalyst, which is applied in the direction of cerium oxide/cerium hydroxide, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., which can solve the problem of low photocatalytic activity

Inactive Publication Date: 2021-01-05
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low photocatalytic activity on the surface of ceria, and to provide a preparation method for exposing high-energy crystal faces of ceria photocatalyst, so as to enhance the photocatalytic activity of ceria, and then make it have stronger Redox and higher catalytic efficiency

Method used

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  • Preparation of cerium dioxide photocatalyst with exposed high-energy crystal face
  • Preparation of cerium dioxide photocatalyst with exposed high-energy crystal face
  • Preparation of cerium dioxide photocatalyst with exposed high-energy crystal face

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Embodiment 1

[0017] Embodiment 1, cubic CeO 2 preparation of

[0018] 10mmol Ce(NO 3 ) 3 ·6H 2 O was dissolved in 25ml deionized water, stirred for 10min, and recorded as solution A. At the same time, measure 50ml of 9mol / L NaOH solution, stir for 0.5h, and record it as solution B. Then the B solution was added dropwise to the A solution. Stir at room temperature for 0.5 h, transfer the above suspension into a 150 ml polytetrafluoroethylene reactor, and heat at 180° C. for 12 h. Then the mixture was cooled to room temperature, suction filtered to obtain solid particles, washed three times with deionized water and absolute ethanol, dried at 80°C for 6 hours, and cube-shaped CeO was obtained after grinding. 2 , whose structure is as figure 1 a.

Embodiment 2

[0019] Embodiment 2, nano spherical CeO 2 preparation of

[0020] 10mmol Ce(NO 3 ) 3 ·6H 2 O was dissolved in 25ml deionized water, stirred for 0.5h, and recorded as solution A. At the same time, measure 50ml of 0.2mol / L NaOH solution, stir for 0.5h, and record it as B solution. Then the B solution was added dropwise to the A solution. After stirring at room temperature for 0.5 h, the above suspension was transferred to a 150 ml polytetrafluoroethylene reactor and heated at 100° C. for 12 h. Then the mixture was cooled to room temperature, filtered with suction to obtain solid particles, washed three times with deionized water and absolute ethanol, dried at 80°C for 6 hours, and ground to obtain CeO 2 nanospheres, whose structure is as figure 1 b.

Embodiment 3

[0021] Embodiment 3, Rod CeO 2 preparation of

[0022] 10mmol Ce(NO 3 ) 3 ·6H 2 O was dissolved in 25ml deionized water, stirred for 0.5h, and recorded as solution A. At the same time, measure 50ml of 6mol / L NaOH solution, stir for 0.5h, and record it as B solution. Then the B solution was added dropwise to the A solution. After stirring at room temperature for 0.5 h, the above suspension was transferred to a 150 ml polytetrafluoroethylene reactor and heated at 110° C. for 12 h. Then the mixture was cooled to room temperature, filtered with suction to obtain solid particles, washed three times with deionized water and absolute ethanol, dried at 80°C for 6 hours, and ground to obtain rod-shaped CeO 2 , whose structure is as figure 1 c.

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Abstract

The invention relates to a preparation method of a cerium dioxide photocatalyst with an exposed high-energy crystal face. According to the invention, the CeO2 nano material with exposed different morphologies and crystal faces, such as nano spheres, nano cubes and nano rods, is prepared by controlling reaction conditions through a simple hydrothermal synthesis method. The preparation process of CeO2 comprises the following steps: respectively dissolving a proper amount of cerium salt and strong alkalis with different concentrations into distilled water to prepare solutions, adding a proper amount of surfactant into the system, stirring the mixture at normal temperature, transferring the mixed solution into a hydrothermal kettle for reaction, and controlling the reaction temperature to obtain products with different morphologies. The method is simple to operate, wherein the morphology and high-energy crystal face composition of the CeO2 nanoparticles can be well regulated and controlledby changing approximate preparation conditions. The method has important significance in application of related catalytic materials.

Description

technical field [0001] The invention relates to a method for preparing a photocatalyst of exposed high-energy crystal faces of ceria, and prepared ceria with different morphologies and high-energy crystal faces by controlling the reaction conditions; Photocatalytic degradation of organic pollutants by cerium oxide nanomaterials. Background technique [0002] CeO 2 As a common photocatalytic semiconductor material, it has received extensive attention in the field of environmental catalysis in recent years. The chemical properties of ceria are very special, and its outer electron filling method is 4f 1 ,5d 1 ,6s 2 . Therefore, in addition to existing in a trivalent state like other rare earth elements, cerium can also exist stably in a positive tetravalent state. Due to Ce 3+ / C 4+ The characteristic of low redox potential among them makes it rich in oxygen vacancies, which is considered as a promising photocatalyst. However, the photoinduced rapid recombination of el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/02B01J35/08C01F17/235C02F1/30C02F101/38B01J35/00
CPCB01J23/10C01F17/235C02F1/30C01P2002/01C01P2002/72C02F2101/38C02F2305/10B01J35/00B01J35/30B01J35/51B01J35/39
Inventor 刘建军刘文琦左胜利
Owner BEIJING UNIV OF CHEM TECH
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