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Method for preparing titanium dioxide photocatalysis environment purifying material

A technology of titanium dioxide and photocatalysis, applied in the field of photocatalysis, can solve the problems of low surface reaction rate, limit the practical application of titanium dioxide, and low quantum efficiency, achieve good adsorption effect, improve photocatalytic oxidation performance, and inhibit electron and hole recombination Effect

Inactive Publication Date: 2017-04-05
ANHUI RUIYAN NEW MATERIAL TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the photocatalysis of conventional titanium dioxide, its photogenerated electrons and holes recombine in a very short time, resulting in low quantum efficiency and low surface reaction rate; in addition, conventional titanium dioxide requires ultraviolet light with a wavelength less than 387nm to act as a photocatalyst. Catalysis, which greatly limits the practical application of titanium dioxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of titanium dioxide photocatalytic purification environment material, first depositing Ag on TiO 2 surface, and then TiO loaded with Ag 2 Be immobilized on chitosan, specifically comprise the following steps:

[0017] S1, the TiO 2 , deionized water, and absolute ethanol were added into 250mL water in a ratio of 1:3:17 by volume and ultrasonically mixed to obtain a suspension solution A;

[0018] S2. Mix the suspension solution A and the sodium hydroxide solution according to the volume ratio of 6:3, continue to stir for 2 hours to carry out the hydrolysis reaction and fully mix to obtain the suspension solution B;

[0019] S3. Add 3 mL of hydrochloric acid and 8 g of chitosan to the suspension solution B, and after stirring evenly, irradiate with ultraviolet light for a period of time to obtain a milky solution C;

[0020] S4. Standing and aging the milky solution C at room temperature for 24 hours to obtain a gel, which is then dried, ground, c...

Embodiment 2

[0025] A preparation method of titanium dioxide photocatalytic purification environment material, first depositing Ag on TiO 2 surface, and then TiO loaded with Ag 2 Be immobilized on chitosan, specifically comprise the following steps:

[0026] S1, the TiO 2 , deionized water, and absolute ethanol were added into 300mL water in a ratio of 1:5:19 by volume and ultrasonically mixed to obtain a suspension solution A;

[0027] S2. Mix the suspension solution A and the sodium hydroxide solution according to the volume ratio of 7:3, continue to stir for 2.5 hours to carry out the hydrolysis reaction and fully mix to obtain the suspension solution B;

[0028] S3. Add 3 mL of hydrochloric acid and 9 g of chitosan to the suspension solution B, and after stirring evenly, irradiate with ultraviolet light for a period of time to obtain a milky solution C;

[0029] S4. The milky solution C was aged at room temperature for 45 hours to obtain a gel, which was then dried, ground, calcined...

Embodiment 3

[0034] A preparation method of titanium dioxide photocatalytic purification environment material, first depositing Ag on TiO 2 surface, and then TiO loaded with Ag 2 Be immobilized on chitosan, specifically comprise the following steps:

[0035] S1, the TiO 2 , deionized water, and absolute ethanol were added into 350mL water in a ratio of 1:7:21 by volume and ultrasonically mixed to obtain a suspension solution A;

[0036] S2. Mix the suspension solution A and the sodium hydroxide solution according to the volume ratio of 8:3, continue to stir for 3 hours to carry out the hydrolysis reaction and fully mix to obtain the suspension solution B;

[0037] S3. Add 3 mL of hydrochloric acid and 10 g of chitosan to the suspension solution B, and after stirring evenly, irradiate with ultraviolet light for a period of time to obtain a milky solution C;

[0038] S4. Standing and aging the milky solution C at room temperature for 60 hours to obtain a gel, which is then dried, ground, ...

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Abstract

The invention discloses a method for preparing a titanium dioxide photocatalysis environment purifying material. According to the invention, Ag is deposed on the TiO2 surface, Ag-supported TiO2 is immobilized on chitosan, the method comprises the following steps: S1) adding TiO2, deionized water, and absolute ethyl alcohol according to the volume ratio of 1:3-7:17-21 in 250-350 mL of water for performing ultrasonic mixing to obtain a suspension solution A; S2) mixing the suspension solution A and the sodium hydroxide solution according to the volume ratio of 6-8:3, and continuously stirring a mixture for 2-3 hours and performing a hydrolysis reaction, fully mixing the materials to obtain a suspension solution B; 3) adding 3 mL of hydrochloric acid and 8-10 g of chitosan in the suspension solution B, uniformly stirring the materials and employing ultraviolet irradiation for a while to obtain an emulsified solution C; and 4) standing the emulsified solution C under room temperature and aging the material for 24-60 hours to obtain a gel, drying the gel, grinding the gel, and calcining and grinding the gel to obtain the final product.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a preparation method of a titanium dioxide photocatalytic purification environment material. Background technique [0002] With the increasingly prominent environmental pollution, air quality and water quality issues have attracted more and more attention. In recent years, the use of semiconductor photocatalytic materials, especially the heterogeneous photocatalytic process of photocatalytic oxidation of organic pollutants in air or water using titanium dioxide has become an ideal environmental treatment technology. Photocatalysis can be carried out at normal temperature and pressure, and can directly use oxygen in the atmosphere as an oxidant. It is an effective clean environment treatment technology and has been widely studied at home and abroad. However, during the photocatalysis of conventional titanium dioxide, its photogenerated electrons and holes recombine in a very short t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01J20/24B01J20/30
CPCB01J20/02B01J20/06B01J20/24B01J31/38B01J2220/4825B01J2220/46B01J2220/4806B01J35/39
Inventor 王举孙益民芮定文
Owner ANHUI RUIYAN NEW MATERIAL TECH RES INST
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