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SiO2-TiO2 composite metamaterial structure photocatalyst and preparation method thereof

A technology of structured light and catalyst, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low solar energy utilization, low quantum efficiency, etc., to improve photocatalytic performance and reduce liquid Effect of low surface tension and reaction temperature

Active Publication Date: 2020-07-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO 2 It is one of the semiconductor photocatalytic materials that has attracted attention in heterogeneous photocatalytic reactions. However, due to its wide band gap and low quantum efficiency, its solar energy utilization rate is low, accounting for less than 5% of the total energy.

Method used

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  • SiO2-TiO2 composite metamaterial structure photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A SiO 2 -TiO 2 The preparation method of composite metamaterial structure photocatalyst, the steps are as follows:

[0016] (1) Mix styrene and α-methacrylic acid at a ratio of 30:1 by volume, add water to make a 6vol% solution, and heat to 75°C. After the solution is stable, add 0.14g persulfuric acid per 100mL Potassium, reacted for 10 hours to obtain polystyrene sol, then mixed and diluted polystyrene sol with deionized water at a ratio of 1:30, and deposited vertically at 40°C to form colloidal crystals.

[0017] (2) Mix 2mL tetraethyl orthosilicate and absolute ethanol at a ratio of 1:1.5 and stir evenly. After stirring evenly, add 2g of citric acid; take another beaker and mix absolute ethanol and deionized water at a ratio of 1:1. Prepare 10 mL of solution. After the two solutions were mixed and stirred evenly, ammonia water was added to adjust the pH value of the solution to 8, and after stirring for 5 minutes, SiO 2 Sol. Prepared SiO 2 The sol is impregna...

Embodiment 2

[0021] A SiO 2 -TiO 2 The preparation method of composite metamaterial structure photocatalyst, the steps are as follows:

[0022] (1) Mix styrene and α-methacrylic acid evenly at a ratio of 15:1 by volume, add water to make 6vol% and heat to 80°C. After the solution is stable, add 0.10g of potassium persulfate per 100mL to react After 8 hours, the polystyrene sol was obtained, and then the polystyrene sol was mixed and diluted with deionized water at a ratio of 1:20, and then deposited vertically at 40°C to form colloidal crystals.

[0023] (2) Mix 2mL tetraethyl orthosilicate and absolute ethanol at a ratio of 1:1.5 and stir evenly. After stirring evenly, add 3g of citric acid; take another beaker and mix absolute ethanol and deionized water at a ratio of 1:1 Prepare 10 mL of solution. After the two solutions were mixed and stirred evenly, ammonia water was added to adjust the pH value of the solution to 8, and after stirring for 5 minutes, SiO 2 Sol. Prepared SiO 2 Th...

Embodiment 3

[0026] A SiO 2 -TiO 2 The preparation method of composite metamaterial structure photocatalyst, the steps are as follows:

[0027] (1) Mix styrene and α-methacrylic acid evenly at a ratio of 30:1 by volume, add water to make 6vol% and heat to 85°C. After the solution is stable, add 0.2g potassium persulfate per 100mL to react After 9 hours, the polystyrene sol was obtained, and then the polystyrene sol was mixed and diluted with deionized water at a ratio of 1:15, and then deposited vertically at 40°C to form colloidal crystals.

[0028] (2) Mix 3mL tetraethyl orthosilicate and absolute ethanol at a ratio of 1:1.5 and stir evenly. After stirring evenly, add 2g of citric acid; take another beaker and mix absolute ethanol and deionized water at a ratio of 1:1 Prepare 12mL of solution. After the two solutions were mixed and stirred evenly, ammonia water was added to adjust the pH value of the solution to 8, and after stirring for 5 minutes, SiO 2 Sol. Prepared SiO 2 The sol...

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Abstract

The invention discloses a SiO2-TiO2 composite metamaterial structure photocatalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a SiO2 inverse opalstructure by taking PS colloidal crystals as a template, and growing TiO2 in the SiO2 inverse opal structure by adopting a hydrothermal method to prepare the SiO2-TiO2 composite metamaterial structure photocatalyst. The method is simple in process, short in period, simple in equipment and low in cost, and the obtained composite material shows high photocatalytic performance due to the change of curved surface composite morphology.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst materials, in particular to a SiO 2 -TiO 2 Composite metamaterial structured photocatalyst and preparation method thereof. Background technique [0002] Metamaterials are composite materials that have artificially designed structures and exhibit extraordinary physical properties that natural materials do not have. At present, metamaterials have been widely used in electromagnetic, optical, thermal, mechanical and other fields. TiO 2 It is one of the semiconductor photocatalytic materials that has attracted attention in heterogeneous photocatalytic reactions. However, due to its wide band gap and low quantum efficiency, its solar energy utilization rate is low, accounting for less than 5% of the total energy. Contents of the invention [0003] In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of SiO 2 -TiO 2 Com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J35/10B01J37/10B01J37/08
CPCB01J21/08B01J37/10B01J37/036B01J37/082B01J35/60B01J35/61B01J35/39Y02W10/37
Inventor 伍媛婷曾柏林张新孟薛云龙吴鹏宏
Owner SHAANXI UNIV OF SCI & TECH
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