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Preparation method and application of high-activity cerium dioxide photocatalyst

A technology of cerium oxide and photocatalyst, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as increasing energy consumption, reduce pollution, Good social and economic benefits, the effect of low synthesis temperature

Inactive Publication Date: 2018-12-21
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photocatalytic performance of the material can be regulated by the method of morphology regulation and heterogeneous metal ion doping, but by regulating the CeO 2 Reports of its own activity are rare
At the same time, the commonly used activity regulation to prepare CeO 2 The method generally involves harsh conditions or means such as hydrothermal (solvothermal), plasma diffraction or high-temperature calcination, which also increases the energy consumption in the preparation process.

Method used

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  • Preparation method and application of high-activity cerium dioxide photocatalyst
  • Preparation method and application of high-activity cerium dioxide photocatalyst
  • Preparation method and application of high-activity cerium dioxide photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step S1: Add 0.50 g of cerium nitrate into 50 mL of ethanol and stir to dissolve to obtain a homogeneous solution;

[0023] Step S2: Add 1.8 mL of hydrogen peroxide into the homogeneous solution obtained in Step S1, and react at room temperature for 0.5 h to obtain a mixed solution;

[0024] Step S3: adding an aqueous potassium hydroxide solution with a mass concentration of 10% to the mixed solution obtained in step S2, adjusting the pH of the mixed system to 12, continuing to stir and react for 2 hours, centrifuging and washing the precipitate in the reaction solution with deionized water;

[0025] Step S4: drying the precipitate obtained in step S3 at 60° C. for 12 hours to obtain a highly active ceria nanomaterial.

[0026] The photocatalytic activity of the ceria photocatalytic material prepared in this example as a visible light photocatalyst was characterized by photocatalytic degradation of methylene blue and methyl orange solutions. The experimental process is...

Embodiment 2

[0030] Step S1: Add 1.50 g of cerium acetate into 100 mL of ethylene glycol and stir to dissolve to obtain a homogeneous solution;

[0031] Step S2: Add 2 mL of hydrogen peroxide into the homogeneous solution obtained in Step S1, and react at room temperature for 1 hour to obtain a mixed solution;

[0032] Step S3: adding an aqueous sodium carbonate solution with a mass concentration of 10% to the mixed solution obtained in step S2, adjusting the pH of the mixed system to 8, continuing to stir and react for 1 hour, centrifuging the precipitate in the reaction solution and washing it with deionized water;

[0033] Step S4: drying the precipitate obtained in step S3 at 120° C. for 6 hours to obtain a highly active ceria nanomaterial.

[0034] The photocatalytic performance test of the ceria nanomaterial prepared in this example refers to the method in Example 1, and the results are listed in Table 2.

[0035] Table 2

[0036]

Embodiment 3

[0038] Step S1: Add 0.50 g of cerium nitrate into 20 mL of ethylene glycol and stir to dissolve to obtain a homogeneous solution;

[0039] Step S2: Add 0.2 mL of hydrogen peroxide into the homogeneous solution obtained in Step S1, and react at room temperature for 0.5 h to obtain a mixed solution;

[0040] Step S3: adding an aqueous potassium hydroxide solution with a mass concentration of 10% to the mixed solution obtained in step S2, adjusting the pH of the mixed system to 7.5, continuing to stir and react for 2 hours, centrifuging the precipitate in the reaction solution and washing it with deionized water;

[0041] Step S4: drying the precipitate obtained in step S3 at 280° C. for 0.5 h to obtain a highly active ceria nanomaterial.

[0042] The photocatalytic performance test of the ceria nanomaterial prepared in this example refers to the method in Example 1, and the results are listed in Table 3.

[0043] table 3

[0044]

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Abstract

The invention discloses a preparation method and application of a high-activity cerium dioxide photocatalyst and belongs to the technical field of synthesis of cerium dioxide photocatalysts. Accordingto the technical scheme, the preparation method is characterized by comprising the following steps: dissolving trivalent cerium salt into an alcohol solvent to obtain a uniform solution; adding hydrogen peroxide into the uniform solution; reacting at room temperature for 0.5 to 2h to obtain a mixed solution; adding a sedimentation agent into the mixed solution; regulating the pH (Potential of Hydrogen) of a mixing system to be 7 to 12; continually stirring and reacting for 0.5 to 2h; carrying out centrifugal separation on sediment in a reaction solution and washing with de-ionized water; drying sediment at 40 to 300 DEG C for 0.5 to 12h to obtain a high-activity cerium dioxide nano-material. The photocatalytic material prepared by the invention has efficient photocatalytic performance, can be used for effectively degrading organic pollutants under sunlight or visible light irradiation and hopefully has good social and economic benefits in the field of environment management.

Description

technical field [0001] The invention belongs to the technical field of synthesis of ceria photocatalysts, and in particular relates to a preparation method and application of a highly active ceria photocatalyst. Background technique [0002] Ceria (CeO 2 ) is a cheap and versatile rare earth oxide, which is widely used in automobile exhaust purification, catalysts, oxygen sensors, solid oxide fuel cell electrode materials, Modern high-tech fields such as chemical machine polishing and abrasive materials. In particular, it has relatively good photocatalytic and thermal catalytic activities, and can be well applied in photolysis of water and fuel cells. However, due to its small specific surface area and low dispersion of active components, it affects the improvement of catalytic activity. With the global pollution problem, ceria has attracted great interest in the field of photocatalysis. [0003] Due to CeO 2 The forbidden band width is 3.1eV, it can only absorb ultravi...

Claims

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Application Information

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IPC IPC(8): B01J23/10C01F17/00B82Y30/00C02F1/30C02F101/30C02F101/34C02F101/36C02F101/38
CPCB82Y30/00C02F1/30B01J23/10C02F2305/10C02F2101/36C02F2101/34C02F2101/40C02F2101/38C02F2101/308C01P2002/72C01P2002/84C01F17/206B01J35/39
Inventor 苏莉康朴华王亮刘建明毛国江董文佩秦赛男
Owner HENAN NORMAL UNIV
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