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Process for coating Bi2O3/TiO2 photocatalysis film on surface of hollow lightweight glass sphere

A technology of photocatalytic film and glass spheres, applied in chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low mass transfer efficiency and low utilization rate of irradiation light, and achieve high mass transfer efficiency, high utilization rate, The effect of easy operation

Inactive Publication Date: 2015-02-25
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low light utilization rate and low mass transfer efficiency in the design of photocatalytic reactors and to obtain a simple and efficient coating technology, and to provide a new type of photocatalytic reactor and a low-cost, easy-to-operate coating process

Method used

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  • Process for coating Bi2O3/TiO2 photocatalysis film on surface of hollow lightweight glass sphere
  • Process for coating Bi2O3/TiO2 photocatalysis film on surface of hollow lightweight glass sphere
  • Process for coating Bi2O3/TiO2 photocatalysis film on surface of hollow lightweight glass sphere

Examples

Experimental program
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Effect test

Embodiment 1

[0034] After surface treatment of glass spheres, make solution A with 0.25g pentanediol, 0.7g water, 1.0g polyethylene glycol and 100mL ethanol and stir for 30min. into B solution. Add solution A to solution B, mix well, add 2mL concentrated nitric acid to adjust the pH to 3-4, then add bismuth nitrate pentahydrate to the solution so that the Bi / Ti molar ratio is 1.0%, and the precursor solution can be obtained. Put the glass ball in the precursor solution and rotate it to make the surface fully contact with the precursor solution. Take out the ball and blow it dry quickly with a hair dryer to obtain a uniform film, then put it in an oven to dry at 100°C for 1 hour. Repeat the above operation 2 times, that is, after the number of coating times is 3 times, place the glass ball in a muffle furnace at 500 ° C for 4 hours to obtain the surface coated with Bi 2 o 3 / TiO 2Glass spheres with photocatalytic films. Place the coated glass balls in a suspension reactor with a diamete...

Embodiment 2

[0041] No bismuth nitrate was added during the preparation, that is, the Bi / Ti molar ratio was 0, and the rest of the content was the same as that described in Example 1. Figure 4 The UV-vis DRS spectrum in shows that TiO in the present embodiment 2 The film has no obvious absorption in the visible region.

Embodiment 3

[0043] During the preparation process, the Bi / Ti molar ratio was controlled to be 0.5%, and the remaining content was the same as that described in Example 1. Figure 4 The UV-vis DRS spectrum in shows that due to Bi 2 o 3 The modification effect makes this embodiment more pure TiO in the visible light region 2 The thin film has a stronger light absorption intensity.

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Abstract

The invention discloses a process for coating a Bi2O3 / TiO2 photocatalysis film on the surface of a hollow lightweight glass sphere and discloses application of the hollow lightweight glass sphere with a surface coated with the Bi2O3 / TiO2 photocatalysis film. According to the process, bismuth nitrate, titanium tetrabutoxide, nitric acid, water, pentanediol, polyethylene glycol, acetylacetone and the like are adopted for forming a precursor solution; the sphere is rotatably coated with a film and then is quickly dried to obtain the uniform Bi2O3 / TiO2 catalyst film; the glass sphere with the Bi2O3 / TiO2 photocatalysis film coated on the surface is placed into a suspending type photocatalysis reactor and can be used for degrading organic pollutants such as methyl orange under illumination, and the glass sphere is excellent in photocatalysis performance; the process has the advantages that the raw materials are easily available, the preparation cost is low, the film coating process is simple, and the condition is easy to control; and the liquid film on the surface of the glass sphere is thin, has high light transmittance and high transfer efficiency, does not need to be separated and recycled and is capable of continuously working; and simultaneously, the process provides reference value respect to other film coating technologies and brings basic theoretical basis for designing and amplifying the photocatalysis reactor in future.

Description

technical field [0001] The invention belongs to the field of preparation technology and application of semiconductor photocatalytic reactors, in particular to a kind of hollow light glass sphere surface coated with Bi 2 o 3 / TiO 2 Process of photocatalytic thin films. Background technique [0002] While the rapid development of world industry has provided people with rich material life, it has also brought many environmental problems. The discharge of waste in industrial production destroys the ecological balance, pollutes the environment, and seriously threatens people's healthy life. Among them, dye wastewater is one of the industrial wastewater that is difficult to degrade at present. It has deep color, high toxicity, carcinogenicity and serious environmental pollution. Semiconductor photocatalytic materials have extremely broad application prospects due to their strong oxidation ability, ability to degrade a variety of toxic and harmful pollutants, environmental frie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18B01J8/18A62D3/17A62D101/28
Inventor 霍宇凝李虎张亚陈晓芳潘改芳李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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