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Silver-loaded nanometer titanium dioxide sol, preparation method and applications thereof

A nano-titanium dioxide, titanium dioxide technology, applied in the direction of botany equipment and methods, applications, chemicals for biological control, etc., can solve the problems of low concentration of titanium dioxide, poor stability, large particle size, etc.

Active Publication Date: 2019-09-20
厦门威亮光学涂层技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new silver-loaded nano-titanium dioxide sol in order to overcome the problems of large particle size, poor stability, low titanium dioxide concentration and uneven silver dispersion in the silver-loaded nano-titanium dioxide material prepared by the existing method. and its preparation method and application, the silver-loaded nano titanium dioxide sol particles made by the method have small particle size, large specific surface area, good stability, high concentration of titanium dioxide and uniform silver dispersion

Method used

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  • Silver-loaded nanometer titanium dioxide sol, preparation method and applications thereof
  • Silver-loaded nanometer titanium dioxide sol, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of titanium dioxide aqueous dispersion:

[0030] Convert 53.5g to solid TiO 2 15g of tetraisopropyl titanate was slowly added dropwise to 417g of 3.6wt% aqueous hydrogen peroxide solution, stirred until the solid particles were completely dissolved, then 30g of triethylamine was added dropwise to obtain 500g of a yellow, clear and transparent titanium dioxide precursor solution . Then add 15 g of commercially available silica sol (the average particle diameter of the silica contained therein is 10 nm) containing 20 wt % solid content to the 500 g titanium dioxide precursor solution, and hydrothermally treat it in an autoclave at 150° C. for 5 h to obtain Aqueous dispersion of titanium dioxide.

[0031] (2) Washing and concentration:

[0032] The above aqueous titanium dioxide dispersion was cooled to room temperature, washed to neutrality with distilled water using an ultrafiltration device, and concentrated to obtain 165 g of concentrated titanium di...

Embodiment 2

[0036] (1) Preparation of titanium dioxide aqueous dispersion:

[0037] Convert 42.6g to solid TiO 210g of tetra-n-butyl titanate is slowly added dropwise to 956.4g of 6.27wt% hydrogen peroxide aqueous solution, stirred until the solid particles are completely dissolved, then 1g of triethanolamine is added dropwise to obtain 1000g of yellow, clear and transparent titanium dioxide precursor solution . Then add 50 g of commercially available silica sol containing 20 wt % solid content (the average particle diameter of the silica contained therein is 5 nm) to the 1000 g titanium dioxide precursor solution, and hydrothermally treat it in an autoclave at 120° C. for 20 h to obtain Aqueous dispersion of titanium dioxide.

[0038] (2) Washing and concentration:

[0039] The above aqueous titanium dioxide dispersion was cooled to room temperature, washed to neutrality with distilled water using an ultrafiltration device, and concentrated to obtain 1000 g of concentrated titanium di...

Embodiment 3

[0043] (1) Preparation of titanium dioxide aqueous dispersion:

[0044] Convert 89.3g to solid TiO 2 Add 25g of tetraisopropyl titanate slowly dropwise to 385.7g of 19.45wt% hydrogen peroxide aqueous solution, stir until the solid particles are completely dissolved, then add 25g of citric acid dropwise to obtain 500g of yellow, clear and transparent titanium dioxide precursor solution . Then add 125g of commercially available silica sol (the average particle diameter of the silica contained therein is 8nm) containing 20wt% solid content to the 500g titanium dioxide precursor solution, and hydrothermally treat it at 200°C for 10h in an autoclave to obtain Aqueous dispersion of titanium dioxide.

[0045] (2) Washing and concentration

[0046] The above aqueous titanium dioxide dispersion was cooled to room temperature, washed to neutrality with distilled water using an ultrafiltration device, and concentrated to obtain 250 g of concentrated titanium dioxide sol with a solid c...

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Abstract

The invention belongs to the field of compound preparation, and discloses a silver-loaded nanometer titanium dioxide sol, a preparation method and applications thereof. The preparation method comprises: (1) carrying out mixing hydrolysis on an alkoxy titanium compound, hydrogen peroxide, a complexing agent and water, uniformly mixing the obtained titanium dioxide precursor solution and a nucleating agent, and carrying out hydrothermal treatment to obtain a titanium dioxide water dispersion liquid; (2) cooling the titanium dioxide water dispersion liquid to a room temperature, washing with water to achieve neutrality, and concentrating to obtain a concentrated titanium oxide sol; and (3) uniformly mixing the concentrated titanium oxide sol and a silver nitrate aqueous solution, and irradiating the obtained titanium-silver mixed solution with ultraviolet light. According to the present invention, with the method, the silver-loaded nanometer titanium dioxide sol with characteristics of small particle size, large specific surface area, good stability and high titanium dioxide concentration can be obtained, and the dispersibility of silver can be effectively controlled, such that silver is uniformly dispersed on the surface of the carrier titanium dioxide so as to enhance the antibacterial effect.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a silver-loaded nano-titanium dioxide sol and a preparation method and application thereof. Background technique [0002] metal oxide TiO 2 It is a typical photocatalyst antibacterial material, which has strong antibacterial ability under ultraviolet irradiation conditions, and can be used in environmental protection fields such as removing nitrogen oxides in air pollution and water pollution treatment. Nano-silver is the most efficient metal antibacterial material known, which has the advantages of good antibacterial effect, low concentration, and many types of sterilization. At present, researchers have developed silver-loaded nano-titanium dioxide materials by taking advantage of the advantages of both. [0003] There are many methods for preparing silver-loaded nano-titanium dioxide materials involved in the prior art. For example, CN1318133C discloses a met...

Claims

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Application Information

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IPC IPC(8): A01N25/04A01N59/16A01P1/00
CPCA01N25/04A01N59/16
Inventor 吴后胜蔡仁钦严国杭
Owner 厦门威亮光学涂层技术有限公司
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