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Composite photocatalitic germicide

A technology of composite photocatalyst and antibacterial agent, which is applied in the direction of bactericide, biocide, biocide, etc., can solve the problems that antibacterial performance fibers and textiles cannot be used, the particle size of silver-loaded titanium dioxide is large, and the photocatalytic antibacterial performance is poor. Effects of improved antibacterial performance, high catalytic activity, and good antibacterial performance

Inactive Publication Date: 2006-06-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of silver-loaded titanium dioxide prepared by thermal deposition method is relatively coarse, and the photocatalytic antibacterial performance is poor; the surface of titanium dioxide has not been modified, so it cannot be used to prepare fibers and textiles with antibacterial properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Composite photocatalyst antibacterial agent, its component and weight percent are: TiO 2 (87.0%), SiO 2 (10.7%) and Ag (2.3%), its preparation process is as follows:

[0011] Dissolve tetrabutyl titanate in absolute ethanol to prepare a 10% ethanol solution of tetrabutyl titanate, prepare a mixed solution of deionized water and ethanol at a ratio of 1:5, and drop a small amount of glacial acetic acid to make the deionized water, The pH value of the ethanol mixture is 4, and an equal volume of deionized water and ethanol mixture is dropped into the tetrabutyl titanate ethanol solution, stirring while dropping, and the temperature of the solution is kept at 15°C. After adding the tetrabutyl titanate ethanol solution into the mixed solution of deionized water and ethanol, stir for 6 hours to obtain a uniform and transparent titanium dioxide sol.

[0012] Dissolve ethyl orthosilicate in absolute ethanol, prepare 10% ethyl orthosilicate ethanol solution, prepare deionized ...

Embodiment 2

[0016] Composite photocatalyst antibacterial agent, its component and weight percent are: TiO 2 (80.6%), SiO 2 (16.5%) and Ag (2.9%), its preparation process is as follows:

[0017] Dissolve tetrabutyl titanate in absolute ethanol to prepare a 10% ethanol solution of tetrabutyl titanate, prepare deionized water and ethanol mixture at a ratio of 1:3, add a small amount of glacial acetic acid to make the deionized water, The PH value of the ethanol mixture is 4.5, drop an equal volume of deionized water and ethanol mixture into the tetrabutyl titanate ethanol solution, stir while adding, keep the temperature of the solution at 25°C, wait until the deionized water and ethanol are mixed After adding tetrabutyl titanate ethanol solution to the solution, stir for 5 hours to obtain a uniform and transparent titanium dioxide sol.

[0018] Dissolve ethyl orthosilicate in absolute ethanol, prepare 10% ethyl orthosilicate ethanol solution, prepare deionized water and ethanol mixed solu...

Embodiment 3

[0022] Composite photocatalyst antibacterial agent, its component and weight percent are: TiO 2 (73.7%), SiO 2 (22.6%) and Ag (3.7%), its preparation process is as follows:

[0023] Dissolve tetrabutyl titanate in absolute ethanol to prepare a 10% ethanol solution of tetrabutyl titanate, prepare deionized water and ethanol mixture at a ratio of 1:3, add a small amount of glacial acetic acid to make the deionized water, The PH value of the ethanol mixture is 5. Drop an equal volume of deionized water and ethanol mixture into the tetrabutyl titanate ethanol solution, and stir while adding. The temperature of the solution is kept at 35°C. After the deionized water and ethanol are mixed After adding tetrabutyl titanate ethanol solution to the solution, stir for 4 hours to obtain a uniform and transparent titanium dioxide sol.

[0024] Dissolve ethyl orthosilicate in absolute ethanol, prepare 10% ethyl orthosilicate ethanol solution, prepare deionized water and ethanol mixed solu...

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Abstract

A composite photolytic antibacterial agent for antibacterial polymer, fiber and fabrics contains proportionally the nanoparticles of TiO2, SiO2 and Ag. It features that the TiO2 and Ag nanoparticles are wrapped by SiO2 nanoparticles to form a special porous layer.

Description

technical field [0001] The invention relates to a product in the technical field of chemical industry, in particular to a composite photocatalyst antibacterial agent. Background technique [0002] Nano-TiO 2 Under the irradiation of ultraviolet rays, electrons transition from the valence band to the conduction band, forming hole-electron pairs, which are adsorbed and dissolved in nano-TiO 2 Surface oxygen captures electrons to form reactive oxygen species O 2 - , while the holes will be adsorbed on the nano-TiO 2 Surface OH - and H 2 O is oxidized to free radical HO · . Active Oxygen O 2 - and radical HO · It can penetrate the cell wall of bacteria, enter the bacteria, prevent the transmission of film-forming substances, block its respiratory system and electron transmission system, and effectively kill bacteria. Nano-TiO 2 Another advantage of sterilization is that it degrades the toxic substances released by bacteria when they die. free radical HO · It has a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01P3/00
Inventor 杨琪陈允胡文彬
Owner SHANGHAI JIAO TONG UNIV
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