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Titanium dioxide-graphene composite and its application in photocatalyst nanosol

A technology of titanium dioxide and composite materials, which is applied in the field of photocatalysts, can solve the problems of limited catalytic activity and actual use conditions, the inability of electron holes to migrate in time, and the inability to achieve catalytic effects, etc., to achieve improved photocatalytic properties, excellent electrical properties, and reduced The effect of reducing efficiency

Active Publication Date: 2021-09-03
厦门福华技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium dioxide has a large band gap (3.0eV for the rutile phase and 3.2eV for the anatase phase) and can only be excited by ultraviolet light, which severely limits its catalytic activity and practical use conditions; on the other hand, when titanium dioxide is subjected to When light is irradiated, the excited electron-hole pairs cannot migrate to the surface in time, and rapidly recombine inside, which cannot play a catalytic effect and also reduces its catalytic activity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The production technology of photocatalyst nano-sol, comprises the following steps: add 1g sodium hexametaphosphate in 200g water, stir 10 minutes with 80 revs / min, obtain mixed liquor; Add 5g titanium dioxide in mixed liquor, continue to stir 15 with 80 revs / min minutes; then add 6g of hydrogen peroxide solution with a mass fraction of 20%, shear and emulsify at 5000 rpm for 30 minutes, and let it stand for 12 hours to obtain an emulsion; add 0.6g acetylacetone to the emulsion, and continue to emulsify at 80 rpm Stir for 10 minutes, then adjust the pH to 7 with 1% hydrochloric acid or 1% sodium hydroxide aqueous solution by mass fraction to obtain the photocatalyst nano-sol.

[0037] Pipette 0.5mL of the photocatalyst nano-sol of Example 1 into a beaker, add water to make up to 400mL, ultrasonicate for 20 minutes, and magnetically stir at 80 rpm for 30 minutes as the solution to be tested. The absorption area of ​​the spectral scanning curve in the spectral range of 20...

Embodiment 2

[0040] The production technology of photocatalyst nano-sol, comprises the following steps: add 1g sodium hexametaphosphate in 200g water, stir 10 minutes with 80 revs / min, obtain mixed liquor; Add 4g titanium dioxide, and 1g bismuth molybdate in mixed liquor, continue to Stir at 80 rpm for 15 minutes; then add 6g of 20% hydrogen peroxide solution by mass fraction, shear and emulsify at 5000 rpm for 30 minutes, and leave it for 12 hours to obtain an emulsion; add 0.6g acetylacetone to the emulsion, Continue stirring at 80 rpm for 10 minutes, and then adjust the pH to 7 with 1% hydrochloric acid or 1% sodium hydroxide aqueous solution by mass fraction to obtain the photocatalyst nano-sol.

[0041] The preparation process of the bismuth molybdate is as follows: 4.85g bismuth nitrate pentahydrate and 0.97g sodium molybdate dihydrate are added to 400mL deionized water, after stirring for 30 minutes at 100 rpm, at an ultrasonic power of 300W and an ultrasonic frequency of 25kHz Ultr...

Embodiment 3

[0045] The production technology of photocatalyst nano-sol, comprises the following steps: add 1g sodium hexametaphosphate in 200g water, stir 10 minutes with 80 revs / min, obtain mixed liquor; Add 4g titanium dioxide, and 1g selenium-loaded bismuth molybdate in mixed liquor, Continue to stir at 80 rpm for 15 minutes; then add 6g of hydrogen peroxide solution with a mass fraction of 20%, shear and emulsify at 5000 rpm for 30 minutes, and let stand for 12 hours to obtain an emulsion; add 0.6g of acetyl Acetone, continue to stir at 80 rpm for 10 minutes, then adjust the pH to 7 with 1% hydrochloric acid or 1% sodium hydroxide aqueous solution by mass fraction to obtain the photocatalyst nano-sol.

[0046] The preparation process of the described selenium-loaded bismuth molybdate is as follows: 4.85g bismuth nitrate pentahydrate, 0.97g sodium molybdate dihydrate and 0.25g selenium powder are added to 400mL deionized water, after stirring for 30 minutes at 100 rpm, ultrasonically U...

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Abstract

The invention discloses a titanium dioxide-graphene composite material and its application in a photocatalyst nano solution. The titanium dioxide-graphene composite material is prepared by the following method: titanium dioxide is added to a sodium hydroxide solution and mixed evenly, then graphene is added for ultrasonic dispersion, and obtained after high-temperature and high-pressure reaction. Compared with the prior art, the titanium dioxide-graphene composite material of the present invention is applied to the photocatalyst nano-sol, and the prepared photocatalyst nano-sol has uniform particle size, good dispersibility, high stability, excellent light absorption performance and The invention has good photocatalytic effect, stable performance, simple preparation process and mild preparation conditions, and has good application value.

Description

technical field [0001] The invention relates to the technical field of photocatalyst, in particular to a titanium dioxide-graphene composite material and its application in photocatalyst nano-sol. Background technique [0002] Photocatalyst is a nano-scale metal oxide material, which is coated on the surface of the substrate, and under the action of light, it produces a strong catalytic function, which can effectively degrade toxic and harmful gases in the air; kill a variety of bacteria, and can Toxins released by bacteria or fungi are decomposed or harmlessly treated; at the same time, photocatalysts also have functions such as deodorization and antifouling. The necessary conditions for photocatalysis to work are photocatalysts and light with suitable wavelength conditions. At present, the most commonly used photocatalyst is titanium dioxide material. The reason why titanium dioxide can play a photocatalytic role is determined by its own physical and chemical properties....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18B01J31/38
CPCB01J21/18B01J31/38B01J35/0013B01J35/004
Inventor 张润高
Owner 厦门福华技术有限公司
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