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Preparation method and application of nano cerium oxide-based composite material

A technology of nano-cerium oxide and composite materials, which is applied in the field of preparation of nano-cerium oxide-based composite materials, which can solve the problems of poor selectivity and stability, few adsorption sites on the catalyst surface, and low catalytic efficiency, so as to increase the adsorption capacity , improve selectivity and stability, and improve efficiency

Pending Publication Date: 2022-04-01
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The photocatalytic selectivity and stability of the cerium oxide catalyst doped with other substances provided in the prior art are poor, the number of adsorption sites on the surface of the catalyst is small, and the catalytic efficiency is low

Method used

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  • Preparation method and application of nano cerium oxide-based composite material
  • Preparation method and application of nano cerium oxide-based composite material
  • Preparation method and application of nano cerium oxide-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for preparing a nano-cerium oxide-based composite material, comprising the following steps;

[0037] (1) Mix 0.1mol cerium nitrate, 0.01mol etchant, 0.01mol transition metal salt,

[0038] Dissolve 0.0001mol of surfactant in water and ultrasonically disperse for 0.5-2h to obtain solution 1, the transition metal salt is copper nitrate, the etched product is sodium tungstate, and the surfactant is polyvinylpyrrolidone;

[0039] (2) Dissolve sodium hydroxide in water to obtain 0.1mol / L lye, and obtain solution 2;

[0040] (3) Under the condition of 1000rpm electromagnetic stirring, solution 2 was stirred at a speed of 0.5ml / min

[0041] rate dropwise into solution 1, continue to stir and react for 24 hours, and perform ultrasonication for 6 hours to obtain suspended emulsion 3;

[0042] (4) The object substance obtained after the emulsion was centrifuged was washed with water and ethanol in sequence, and then vacuum-dried. The temperature of the vacuum-dried was 6...

Embodiment 2

[0047] A method for preparing a nano-cerium oxide-based composite material, comprising the following steps;

[0048] (1) Mix 0.1mol cerium nitrate, 0.1mol etchant, 0.05mol transition metal salt,

[0049] Dissolve 0.001mol of surfactant in water and ultrasonically disperse for 2 hours to obtain solution 1, the transition metal salt is ferric nitrate, the etched product is zinc chloride, and the surfactant is polyvinylpyrrolidone;

[0050] (2) Dissolve potassium hydroxide in water to obtain 0.1 mol / L lye to obtain solution 2;

[0051] (3) Under the condition of 1000rpm electromagnetic stirring, solution 2 was stirred at a speed of 0.5ml / min

[0052] rate dropwise into solution 1, continue to stir and react for 24 hours, and perform ultrasonication for 10 hours to obtain suspended emulsion 3;

[0053] (4) The object substance obtained after centrifuging the emulsion was washed with water and ethanol in sequence, and then vacuum-dried. The temperature of the vacuum-dried was 70°...

Embodiment 3

[0058] A method for preparing a nano-cerium oxide-based composite material, comprising the following steps;

[0059] (1) Dissolve 0.434g of cerium nitrate, 0.1g of zinc chloride, 0.05g of nickel nitrate and 5mg of PVP

[0060] After ultrasonic dispersion in water for 1 h, solution 1 was obtained;

[0061] (2) Dissolve 400mg of sodium hydroxide in 20ml of water to prepare (alkaline solution) solution 2;

[0062] (3) Under the condition of 1000rpm electromagnetic stirring, the solution 2 was stirred at 0.5ml / min

[0063] Add it dropwise into solution 1 at a constant rate, continue to stir for 24 hours, and perform ultrasonication for 8 hours to obtain suspended emulsion 3;

[0064] (4) The object substance obtained after centrifuging the emulsion was washed with water and ethanol in sequence, and then vacuum-dried, the temperature of the vacuum-dried was 65°C, and the time was 14h, to obtain the product 4;

[0065] (5) Mix 4g of potassium hydroxide and 200mg of product 4 in 2...

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Abstract

The invention provides a preparation method and application of a nano cerium oxide-based composite material, and belongs to the technical field of catalyst synthesis. The preparation method comprises the following steps: (1) dissolving cerium nitrate, an etching substance, a transition metal salt and a surfactant in water and then carrying out ultrasonic dispersion to obtain a solution 1, and (2) dissolving an alkaline substance in water to obtain a solution 2; (3) under a stirring condition, dropwise adding the solution 2 into the solution 1 to prepare a suspended emulsion 3; (4) centrifuging the emulsion 3 to obtain a product 4; (5) putting an etching agent and the product 4 into water, and mixing to obtain a suspension 5; and (6) putting the suspension 5 into a hydrothermal reaction kettle, and carrying out hydrothermal reaction to obtain the nano cerium oxide-based composite material. According to the preparation method, the photocatalytic selectivity and stability of the material can be improved, adsorption sites of porous or multilayer structures are formed on the surface and inside the material, the adsorption quantity of gas or degraded substances in the photocatalytic process is increased, and the catalytic efficiency of the catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of catalyst synthesis, and in particular relates to a preparation method and application of a nano-cerium oxide-based composite material. Background technique [0002] As a common semiconductor material, cerium oxide is widely used in many fields. In recent years, the special photocatalytic and photochromic properties of cerium oxide and its complex nanomaterials have attracted more and more attention, especially in the field of photocatalysis. In addition, cerium oxide itself has a variety of non-stoichiometric states, which provide the necessary conditions for its reasonable surface vacancies and energy band structure regulation. [0003] The mechanism of semiconductor photocatalysis; when the semiconductor is irradiated by appropriate light, electrons are excited to the conduction band, and holes are generated at the valence band. These carriers undergo interfacial charge transfer through proper adsorpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/83B01J23/888B01J35/00B01J35/02B01J37/00B01J37/10C01B3/04
CPCY02E60/36
Inventor 张怀伟鲍亮陈逸凡元勇军
Owner HANGZHOU DIANZI UNIV