Preparation method of nano-silver composite titanium dioxide sol photocatalyst, masking liquid, component and usage

A technology of titanium dioxide and photocatalyst, which is applied in the field of nano-silver composite titanium dioxide sol photocatalyst, which can solve the problems that the powder and catalyst are exposed to ultraviolet light and the process is complicated.

Inactive Publication Date: 2015-07-08
MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Titanium dioxide can be made into powder and put into waste water directly, or it can be coated on the surface of the substrate to accelerate the decomposition of organic substances in water and air by ultraviolet light irradiation, but it will face the problem of how to recover the powder and whether the surface area of ​​the catalyst can be fully recovered. Exposure to ultraviolet light, etc.
[0014] China Taiwan Patent Application No. 92128954 discloses a method for preparing titanium dioxide nanopowder, which uses oxides such as perchloric acid or inorganic acids to modify the quality by adding modifiers and surfactants. Quality agent and surfactant, the process is more complicated

Method used

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  • Preparation method of nano-silver composite titanium dioxide sol photocatalyst, masking liquid, component and usage
  • Preparation method of nano-silver composite titanium dioxide sol photocatalyst, masking liquid, component and usage

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Embodiment approach 1

[0027] see figure 1 , figure 1 A flow chart of the method for preparing titanium dioxide sol photocatalyst according to an embodiment of the present invention. A method for preparing a titanium dioxide sol photocatalyst, the steps comprising:

[0028] a. Step S110, providing titanium tetrachloride, adding hydrochloric acid aqueous solution at 0-5°C to form A solution;

[0029] b. Step S112, adding NH 4 OH alkaline solution to form titanium hydroxide colloid, the pH value of which is in the range of 7 to 12;

[0030] c. step S114, adding silver nitrate, AgNO 3 / TiO 2 The weight ratio is from 1 / 10 to 1 / 1000, preferably from 10% to 0.01% by weight;

[0031] d. Step S116, adding hydrogen peroxide to form B solution, TiO 2 / H 2 o 2 The weight ratio of hydrogen peroxide is between 1 / 2 and 1 / 10, and the molar ratio of hydrogen peroxide and titanium is preferably between 2 to 1 and 5 to 1. TiO 2 / H 2 The weight ratio of O is between 0.01% and 2%, preferably between 1 / 200 an...

Embodiment 1

[0036] In an ice bath at 0°C, the TiCl 4 Slowly drop into distilled water to make 5 molar concentration (5M), then slowly add the above solution with 30% ammonia water, and keep stirring until the pH value of the solution is 7, after several times of centrifugation and washing, until the concentration of chlorine Below 5000ppm, then add it to distilled water, and add hydrogen peroxide and silver nitrate, its TiO 2 / H 2 o 2 / H 2 O / AgNO 3 The weight ratio ratio is 1 / 2 / 97 / 0.05 (weight ratio). This solution is placed in a three-necked conical flask, connected to a condenser tube, and heated at 90°C for 2 hours to obtain a nano-scale titanium dioxide sol, such as figure 2 shown.

Embodiment 2

[0038] With embodiment 1, only the weight ratio that adds silver nitrate / titanium dioxide is 2 / 100.

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Abstract

The invention provides a preparation method of nano-silver composite titanium dioxide sol photocatalyst. The nano-silver composite titanium dioxide sol photocatalyst can be used as raw materials of coating carriers. Titanium tetrachloride used as raw materials is firstly added into hydrochloric acid solution in ice bath in 0-5 DEG C, and then ammonium hydroxide alkaline solution is added, so titanium hydroxide is prepared. After several times of centrifugation and washing, chloride ions are completely removed and then hydrogen peroxide is added. At present, ratio of solid titanium dioxide to water is 0.01%-3.0%. The mole ratio of the hydrogen peroxide to titanium is 1:1-9:1. Metallic silver is then added, so the temperature of the solution is 60-100 DEG C. After being heated for a while when the titanium hydroxide is completely hydrolyzed, stable transparent nano-silver composite titanium dioxide sol photocatalyst can be formed.

Description

technical field [0001] The invention discloses a preparation method of titanium dioxide sol photocatalyst, which can be used as a raw material for coating carrier, and discloses its application in decontamination, self-cleaning and antibacterial treatment, especially relates to a nano-silver composite titanium dioxide sol Photocatalyst preparation method. Background technique [0002] The so-called photocatalyst is a substance that can promote chemical reactions after being irradiated by light. At present, materials that can be used as photocatalysts include titanium dioxide (TiO 2 ) and other oxides and CdS and other sulfides, among which titanium dioxide is most often used as a photocatalyst because of its strong redox ability, high chemical stability and non-toxic characteristics. Photocatalyst is good at dealing with extremely low concentrations of harmful chemical substances in the air, and will not release harmful substances, so it is an excellent catalyst for enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50A01N59/16A01P1/00
Inventor 陈郁文王子瑜
Owner MATERIAL TECH
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