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Preparation method of 3D-shaped silver/silver bromide/titanium dioxide catalyst

A technology of titanium dioxide and silver bromide, which is applied in the field of preparation of titanium dioxide photocatalysts, and can solve problems such as preparation methods that have not been reported

Inactive Publication Date: 2014-08-20
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But so far, the large specific surface area 3D morphology Ag / AgBr / TiO for photocatalytic degradation 2 The preparation method has not been reported

Method used

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  • Preparation method of 3D-shaped silver/silver bromide/titanium dioxide catalyst
  • Preparation method of 3D-shaped silver/silver bromide/titanium dioxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First, the titanate (isopropyl titanate or tetrabutyl titanate) and concentrated hydrochloric acid are mixed and stirred uniformly. The molar ratio of titanate to hydrochloric acid is 1:50. Add cetyltrimethylammonium bromide (CTAB) to deionized water, mix and stir well. The CTAB aqueous solution was added dropwise to the titanate solution and stirred for 1 hour. The molar ratio of titanate to CTAB is 1:0.5, and the molar ratio of titanate to water is 1:2000. Add a certain amount of ethylene glycol and urea to the above-mentioned mixed solution of titanate and CTAB, and stir evenly. The molar ratio of titanate to ethylene glycol is 1:1000, and the molar ratio of titanate to urea is 1:20. The above-mentioned mixed solution was added to a 100mL hydrothermal kettle, and hydrothermally reacted at 150°C for 24h to generate 3D morphology titanium dioxide. Add silver nitrate and 2mL ammonia to the suspension containing 3D titanium dioxide obtained by hydrothermal reaction, st...

Embodiment 2

[0021] First, the titanate (isopropyl titanate or tetrabutyl titanate) and concentrated hydrochloric acid are mixed and stirred uniformly. The molar ratio of titanate to hydrochloric acid is 1:100. Add cetyltrimethylammonium bromide (CTAB) to deionized water, mix and stir well. The CTAB aqueous solution was added dropwise to the titanate solution and stirred for 1 hour. The molar ratio of titanate to CTAB is 1:1, and the molar ratio of titanate to water is 1:1000. Add a certain amount of ethylene glycol and urea to the above-mentioned mixed solution of titanate and CTAB, and stir evenly. The molar ratio of titanate to ethylene glycol is 1:2000, and the molar ratio of titanate to urea is 1:20. The above-mentioned mixed solution was added to a 100mL hydrothermal kettle, and hydrothermally reacted at 150°C for 24h to generate 3D morphology titanium dioxide. Add silver nitrate and 2mL ammonia to the suspension containing 3D titanium dioxide obtained by hydrothermal reaction, sti...

Embodiment 3

[0024] First, the titanate (isopropyl titanate or tetrabutyl titanate) and concentrated hydrochloric acid are mixed and stirred uniformly. The molar ratio of titanate to hydrochloric acid is 1:200. Add cetyltrimethylammonium bromide (CTAB) to deionized water, mix and stir well. The CTAB aqueous solution was added dropwise to the titanate solution and stirred for 1 hour. The molar ratio of titanate to CTAB is 1:1, and the molar ratio of titanate to water is 1:2000. Add a certain amount of ethylene glycol and urea to the above-mentioned mixed solution of titanate and CTAB, and stir evenly. The molar ratio of titanate to ethylene glycol is 1:2000, and the molar ratio of titanate to urea is 1:40. The above-mentioned mixed solution was added to a 100mL hydrothermal kettle and reacted hydrothermally at 150°C for 12h to generate 3D morphology titanium dioxide. Add silver nitrate and 2mL ammonia to the suspension containing 3D titanium dioxide obtained by hydrothermal reaction, stir...

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Abstract

The invention relates to a preparation method of a 3D-shaped silver / silver bromide / titanium dioxide catalyst. The preparation method comprises the following steps: firstly mixing titanate with concentrated hydrochloric acid, and dropwise adding a water solution of cetyl trimethyl ammonium bromide into a titanate solution; respectively adding ethanol and urea into a mixed solution of the titanate and cetyl trimethyl ammonium bromide, uniformly mixing, and carrying out hydrothermal reaction at 150 DEG C; adding silver nitrate and ammonium hydroxide into turbid liquid obtained in the hydrothermal reaction, stirring for 24 hours, carrying out centrifugal washing and drying, and roasting for 2 hours at 400 DEG C; carrying out reduction on roasted samples for 3 hours under ultraviolet light, so as to obtain the 3D-shaped silver / silver bromide / titanium dioxide catalyst. The preparation method has the beneficial effects that the process is simple, requirements on equipment are low, and the prepared titanium dioxide photocatalyst has strong response under a visible light condition.

Description

Technical field [0001] The invention relates to a method for preparing a silver-loaded titanium dioxide photocatalyst under a high temperature and high pressure environment. Background technique [0002] As a wide-bandgap semiconductor, titanium dioxide is widely used in the fields of atmospheric and water pollutant degradation, antibacterial, deodorization and self-cleaning due to its stable chemical properties and high-efficiency photocatalytic activity. However, the light response range of titanium dioxide is in the ultraviolet region, and the utilization rate of sunlight is low; and the excited electrons are easy to recombine with holes, and the light quantum efficiency is low, which severely restricts its practical application in photocatalysis. In recent years, people have tried to expand the photoresponse range of titanium dioxide by means of metal doping, non-metal doping, metal and non-metal co-doping, semiconductor recombination and dye photosensitization, etc., to supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/08
Inventor 何丹农王婷董亚梅
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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