Method for preparing silver-carrying nano titanic oxide

A nano-titanium dioxide, silver-loaded technology, applied in the fields of botanical equipment and methods, chemicals for biological control, animal repellents, etc., can solve the problems of unsatisfactory sterilization effect, large release amount, discoloration of silver ions, etc. Achieve the effect of enhancing photocatalytic antibacterial effect, improving antibacterial performance and preventing discoloration

Inactive Publication Date: 2008-11-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the titanium dioxide photocatalytic antibacterial agent needs to be sterilized in the presence of ultraviolet light, and the excited free electrons are easy to recombine with holes, making the bactericidal effect unsatisfactory.
Silver-based antibacterial agents are antibacterial agents that add silver ions to carriers such as zeolite, phosp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] First, heat the titanium sulfate solution to 55°C, and continuously add dropwise a 1:1 ammonia solution with a concentration of 25g·L under strong stirring. -1 Silver nitrate solution, reacted for 2 hours under the condition of controlling the final pH to 6, filtered and washed after aging for 35 minutes, dried at 85°C, calcined at 550°C for 1.2 hours, and pulverized after slow cooling to prepare silver-loaded nano-titanium dioxide antibacterial agent .

Embodiment 2

[0010] When using orthotitanic acid as a precursor to prepare silver-loaded titanium dioxide antimicrobial agent, first adjust the orthotitanic acid to a slurry with a solid content of 20%, and then add a concentration of 25g L under strong stirring. -1 silver nitrate solution, and press 10mg·L -1 Add phosphoric acid, sulfuric acid or hydrochloric acid, react for 2 hours, wash and filter, then dry the solid at 85°C, calcinate at 550°C for 1 hour, cool slowly, and grind to prepare silver-loaded nano-titanium dioxide antibacterial agent.

Embodiment 3

[0012] When using metatitanic acid as a precursor to prepare silver-loaded titanium dioxide antibacterial agent, first adjust the metatitanic acid to a slurry with a solid content of 20%, and then add a concentration of 25g L under strong stirring. -1 silver nitrate solution, and press 10mg·L -1 Add phosphoric acid, sulfuric acid or hydrochloric acid, react for 2 hours, wash and filter, then dry the solid matter at 85°C, calcinate at 550°C for 1 hour, cool slowly, and grind to prepare silver-loaded nano titanium dioxide antibacterial agent.

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PUM

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Abstract

The present invention provides a method for preparing a nano silver-carrying titanium dioxide antiseptic. The aqueous ammonia solution and silver nitrate solution are dropped into the titanium sulfate solution simultaneously with continuous stirring. The final reaction pH is controlled by ammonia water. The titanium and silver are leaded to coprecipitate. The solution is filtered and washed after maturing. Afterwards the powder of nano silver-carrying titanium dioxide antiseptic is prepared by drying and calcining. The titanic acid or metatitanic can also be taken as precursor. The slurry containing 15-25% of recursor is added with silver nitrate solution with a concentration of 20-30gL<-1>, and the phosphoric acid, sulfuric acid or hydrochloric acid is added with a concentration of 10-15mgL<-1>. The solution is reacted, filtered and washed under the temperature of 50-60 DEG C. The solid object is dried, crushed, calcined and cooled, and the power of nano silver-carrying titanium dioxide antiseptic is obtained. The invention uses generating an indissoluble silver salt with a preparing technique of titanium dioxide to obtain the sustained-releasing of silver and color changing prevention. Furthermore the complex of the electron pair and the cavity is avoided. The photocatalysis antimicrobial effect of titanium dioxide is reinforced. The color, luster, granularity and dispersibility of the product can be well controlled.

Description

[technical field] [0001] The invention belongs to the field of environmental materials, and relates to a method for preparing a silver-loaded nano-titanium dioxide antibacterial agent. [Background technique] [0002] Titanium dioxide photocatalytic antibacterial agent and silver-based antibacterial agent are both inorganic antibacterial agents, which have the characteristics of safety, durability and wide application, and have been widely used in recent years. But the bandgap width of anatase titanium dioxide (E g ) is 3.2eV, only when there is light irradiation with energy greater than its forbidden band width and wavelength less than 387.5nm, the electrons on the valence band can be excited into the conduction band to form negatively charged highly active electrons e - and generate a corresponding hole h in the valence band + , electrons and holes are separated and migrated to different positions on the particle surface, oxidizing and reducing harmful substances adsorbed...

Claims

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Application Information

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IPC IPC(8): A01N59/16A01N59/00A01P1/00
Inventor 柴立元彭兵韦顺文苑春闵小波蔡练兵王云燕何德文
Owner CENT SOUTH UNIV
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