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Preparation method and application of high-dispersion CeO2 modified TiO2 meso-porous photocatalyst

A photocatalyst and high-dispersion technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. gender issues

Inactive Publication Date: 2015-12-23
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved the existing TiO 2 -CeO 2 The preparation method of composite photocatalyst is complicated and the dispersibility of ceria is poor

Method used

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  • Preparation method and application of high-dispersion CeO2 modified TiO2 meso-porous photocatalyst
  • Preparation method and application of high-dispersion CeO2 modified TiO2 meso-porous photocatalyst
  • Preparation method and application of high-dispersion CeO2 modified TiO2 meso-porous photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]a. Disperse 0.4 g of a water-soluble titanium source di(2-hydroxypropionic acid) diammonium titanium hydroxide solution with a mass percentage of 50% in 120 ml of deionized water;

[0029] b. Weigh the cerium source as 0.045g cerium nitrate hexahydrate solid, add it to the aqueous solution in step a, and stir at room temperature to completely dissolve the cerium nitrate hexahydrate to obtain a mixed solution;

[0030] c. Add 0.1 g of polyethylene glycol (W=6000) to the mixed solution in step b, and stir at room temperature until it is completely dissolved;

[0031] d. Transfer the mixed solution obtained in step c into a high-pressure hydrothermal reaction kettle, and react for 2 hours at a temperature of 250° C. under stirring conditions to obtain a slurry;

[0032] e. Centrifuge the slurry obtained in step d at 11,000 rpm for 5 minutes to obtain a pale yellow precipitate;

[0033] f. Wash the precipitate obtained in step e twice with deionized water and once with abso...

Embodiment 2

[0036] a. Disperse 0.3 g of a titanium source of 50% by mass percentage in 120 ml of deionized water;

[0037] b. Weigh the cerium source as 0.09 cerium nitrate hexahydrate solid, add it to the aqueous solution in step a, stir at room temperature to completely dissolve the cerium nitrate hexahydrate, and obtain a mixed solution;

[0038] c. Add 0.3 g of polyethylene glycol (W=2000) to the mixed solution obtained in step b, and stir at room temperature to completely dissolve the polyethylene glycol to obtain a mixed solution;

[0039] d. Transfer the mixed solution obtained in step c into an autoclave, heat it for 1 hour at a temperature of 180° C. under stirring conditions, and perform a hydrothermal decomposition reaction to obtain a slurry;

[0040] e. Centrifuge the slurry obtained in step d at 11,000 rpm for 5 minutes to obtain a pale yellow precipitate;

[0041] f. Wash the precipitate obtained in step e twice with deionized water and once with absolute ethanol, and then...

Embodiment 3

[0044] a. Disperse 0.5 g of a titanium source of 50% by mass percentage in 120 ml of deionized water;

[0045] b. Weigh the cerium source as 0.0002 cerium nitrate hexahydrate solid, add it to the aqueous solution in step a, stir at room temperature to completely dissolve the cerium nitrate hexahydrate, and obtain a mixed solution;

[0046] c. Add 0.15 g of polyethylene glycol (W=2000) to the mixed solution obtained in step b, and stir at room temperature to completely dissolve the polyethylene glycol to obtain a mixed solution;

[0047] d. Transfer the mixed solution obtained in step c into an autoclave, heat it for 2 hours at a temperature of 200° C. under stirring conditions, and perform a hydrothermal decomposition reaction to obtain a slurry;

[0048] e. Centrifuge the slurry obtained in step d at 11,000 rpm for 5 minutes to obtain a pale yellow precipitate;

[0049] f. Wash the precipitate obtained in step e twice with deionized water and once with absolute ethanol, and ...

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Abstract

The invention discloses a preparation method and an application of a high-dispersion CeO2 modified TiO2 meso-porous photocatalyst. The photocatalyst is a cerium dioxide highly dispersed on the surface of nanometer titanium dioxide. The preparation method comprises the following steps: sealing an aqueous solution of dihydroxybis(ammonium lactato)titanium, cerium nitrate and polyethylene glycol in an autoclave, and carrying out heat insulation at a temperature of 180-250DEG C under stirring conditions for 1-4h to carry out a hydrothermal decomposition reaction; and generating a precipitate, centrifuging, drying, and roasting to obtain the high-dispersion CeO2 modified TiO2 meso-porous photocatalyst. The method has the advantages of simple process and environmental protection. The catalyst prepared through the method has the advantages of large specific surface, adjustable aperture, strong visible light absorption and high photon-generated carrier separation efficiency in order to show good CO2 photoreduction activity in simulated sunlight.

Description

technical field [0001] The invention relates to a highly dispersed CeO 2 Modified TiO 2 Preparation and application of mesoporous photocatalysts. Background technique [0002] In recent years, the greenhouse effect and energy issues have received widespread attention. Among them, the greenhouse gas carbon dioxide mainly comes from the burning of fossil fuels. Based on the fact that fossil fuels will still be the main energy source in the next few decades, carbon dioxide treatment technologies, such as the use of biological fixation, physical / chemical adsorption, and chemical conversion, have been a research hotspot in recent years. Among these technologies, photocatalytic reduction of carbon dioxide not only reduces carbon dioxide emissions, but also converts carbon dioxide into economically valuable hydrocarbon fuels. The process is carried out under normal temperature and pressure, the raw materials are simple and easy to obtain, direct use of solar energy does not nee...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J35/10C07C1/02C07C9/04C01B31/18C01B32/40
Inventor 赵杰王传义王云
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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