Silver-carrying titanium dioxide anti-bacterial agent and preparation method thereof

A technology for carrying silver titanium dioxide and titanium dioxide, which is applied in the fields of botanical equipment and methods, fungicides, biocides, etc., can solve the problems of restricting the application of titanium dioxide, poor slow-release performance, affecting catalytic activity, etc., to enhance the photocatalytic antibacterial effect. , Enhance antibacterial effect, prevent discoloration effect

Inactive Publication Date: 2011-10-05
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electron-hole pairs are easy to recombine, which affects its catalytic activity, and it must be irradiated with ultraviolet light, which limits the application of titanium dioxide.
Silver has good antibacterial and bactericidal effects, but it is expensive, has poor slow-release performance, and is easy to change color under high temperature or oxidizing atmosphere

Method used

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  • Silver-carrying titanium dioxide anti-bacterial agent and preparation method thereof
  • Silver-carrying titanium dioxide anti-bacterial agent and preparation method thereof
  • Silver-carrying titanium dioxide anti-bacterial agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Dip the equal volume of titanium dioxide in ethanol, put it in a vacuum drying oven and dry it at room temperature to obtain liquid A;

[0017] 2) Prepare silver nitrate ethanol solution according to the mass ratio of titanium dioxide to silver of 100:1, prepare 4,4-bipyridine ethanol solution with the mass concentration ratio of silver nitrate and 4,4-bipyridine at 5.3:9.75, and mix the silver nitrate ethanol solution Mix with 4,4-bipyridine ethanol solution to obtain liquid B;

[0018] 3) Mix liquid A and liquid B, and evaporate at 40°C to obtain powder C;

[0019] 4) Add 80ml of ethanol to C, the speed of the magnetic stirrer is 150r / min, under the irradiation of 254nm, 96 watt ultraviolet lamp, light for 2 hours;

[0020] 5) Suction filtration and drying at 80°C to obtain the silver-loaded titanium dioxide microsphere antibacterial agent.

Embodiment 2

[0022] 1) According to the mass ratio of titanium dioxide and silver as 100:1, configure 25ml of titanium dioxide ethanol solution and 50ml of silver nitrate ethanol solution, place them in the photoreactor and beaker respectively, and pass nitrogen gas to deoxygenate for 10 minutes;

[0023] 2) Under the irradiation of 254nm, 96-watt ultraviolet lamp, the rotation speed of the magnetic stirrer is 150r / min, and the titanium dioxide ethanol solution is illuminated for 30 minutes;

[0024] 3) Under the premise of maintaining the same light and rotating speed, use a peristaltic pump to slowly add part of silver nitrate ethanol solution to the titanium dioxide solution, control the drop rate to 2ml / min, and continue to light for 5 minutes;

[0025] 4) Use a peristaltic pump to add the remaining silver nitrate ethanol solution, and continue to illuminate for 2 hours;

[0026] 5) Suction filtration, drying at 80°C and calcining at 500°C for 4 hours to obtain silver-loaded titanium d...

Embodiment 3

[0028] Titanium dioxide was added to silver nitrate aqueous solution, the mass ratio of titanium dioxide to silver was 100:1, calcination at 500°C for 4 hours after rotary evaporation at 60°C, slow cooling, and pulverization to prepare silver-loaded titanium dioxide microsphere antibacterial agent.

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Abstract

The invention belongs to the technical field of environmental catalytic materials and specifically relates to a preparation method of a silver-carrying titanium dioxide anti-bacterial agent. The anti-bacterial agent comprises titanium dioxide microspheres as carriers with a high length-diameter ratio and silver particles distributed on surfaces or interiors of the titanium dioxide microspheres. The preparation method comprises a titanium dioxide microsphere preparation method and a silver particle carrying method, wherein the silver particle carrying method adopts the following three methods of a complex reaction and photo-reduction combined method, a direct photo-reduction method and an excessive immersion method. The operation of the present preparation method is simple. Titanium dioxide carriers prepared by the present preparation method has a high length-diameter ratio, a high crystallinity and thus can reduce effectively recombination of electrons and holes and enhance titanium dioxide photocatalytical and anti-bacterial effects, and the silver particle carrying method can effectively control a dispersibility of silver and make silver be distributed on surfaces or interiors of titanium dioxide microspheres to realize a slow release of silver, avoid color change, and enhance anti-bacterial effects simultaneously.

Description

technical field [0001] The invention belongs to the technical field of environmental catalytic materials, and in particular relates to an antibacterial agent loaded with silver particles on titanium dioxide microspheres and a preparation method thereof. Background technique [0002] Metal oxide titanium dioxide (TiO 2 ) has a special photocatalytic function, however, due to its forbidden band width of 3.2eV, only when the light with a wavelength of less than 387.5nm is irradiated, the electrons on the valence band will be excited into the conduction band, forming a negatively charged high active electron e - , and generate a corresponding hole h in the valence band + , are separated under the action of an electric field and migrate to the particle surface, react with water and oxygen to generate hydroxyl radicals (OH) and reactive oxygen species (O 2 - ), thereby performing a redox reaction with harmful substances adsorbed on the surface. However, electron-hole pairs ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50A01N59/16A01P1/00A01P3/00
Inventor 胡冰清唐幸福孙亮曹青青杨兴业黄志伟操婧婷
Owner FUDAN UNIV
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