Preparation method of nano-gold modified titanium dioxide-carbon nanotube composite photocatalyst

A carbon nanotube composite and titanium dioxide technology, which is applied in the field of air purification, can solve the problems of consumption of organic solvents and template agents, difficulty in controlling the combination of three components, secondary hazards to the ecological environment, etc., and achieve excellent adsorption rate and excellent catalytic degradation effect , the effect of close interface relationship

Active Publication Date: 2020-10-23
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0004] In the prior art, Au-TiO 2 The preparation process of -CNTs composite photocatalyst is relatively complicated, and the combination of the three components is difficult to control, and it is easy to affect the photocatalytic effect. At the same time, a large amount of toxic organic solvents and templates (such as J. , L.Lu, et al.J.Am.Chem.Soc.2007,129,9401; Y.X.Zhang, B.Gao, G.L.Puma, et al.Sci.Adv.Mater.2010,2,503), which will not only increase cost, and will cause secondary harm to the ecological environment

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  • Preparation method of nano-gold modified titanium dioxide-carbon nanotube composite photocatalyst
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  • Preparation method of nano-gold modified titanium dioxide-carbon nanotube composite photocatalyst

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preparation example Construction

[0035] The invention provides a method for preparing a nano-gold modified titanium dioxide-carbon nanotube composite photocatalyst, comprising the following steps:

[0036] a) using an alcohol aqueous solution and a steady-state gas as a medium, and using a micro-nano bubble generator to obtain micro-nano bubble water;

[0037] b) mixing and dispersing the micronano bubble water, carbon nanotubes and titanium salt to obtain a dispersion;

[0038] c) mixing and hydrolyzing the dispersion with an aqueous ammonia solution to obtain a hydrolyzate;

[0039] d) After mixing the hydrolyzate with gold salt and micro-nano bubble water, sequentially carry out light reduction and heating reaction to obtain a reaction product;

[0040] e) heat-treating the reaction product to obtain Au-TiO 2 -CNTs composite photocatalyst.

[0041] In the present invention, micro-nano bubble water is used as a soft template, combined with the above-mentioned specific treatment process, titanium salt, go...

Embodiment 1

[0067] 1.1 Sample preparation

[0068] Using 8L of 11% ethanol aqueous solution and air as the medium, using a micro-nano bubble generator equipped with a high-pressure micro-nano nozzle for processing, the working pressure is 0.40MPa, and the air intake rate is 1.5L / min. After treatment, we get Micro-nano bubble water. Take 80mL of micro-nano bubble water and put it in a 250mL conical flask, according to the mass ratio MWCNTs:TiO 2 =26% Add 83.2mg of MWCNTs and 4mmol TiCl to the above-mentioned micro-nano bubble water successively 4 , Place the Erlenmeyer flask in a sonicator for ultrasonic treatment for 15 minutes to obtain a uniform dispersion. A dilute ammonia solution with a concentration of 2.6% was gradually added dropwise to the above dispersion liquid until a sol state appeared, and then the hydrolysis reaction was continued for 13 hours at a room temperature of 30° C. to obtain a hydrolyzed product. Add 0.018 mmol HAuCl to the resulting hydrolyzate 4 10 mL of mic...

Embodiment 2

[0075] 1.1 Sample preparation

[0076] With 8L of 11% ethanol aqueous solution and air as the medium, the micro-nano bubble generator equipped with high-pressure micro-nano nozzles is used for processing, the working pressure is 0.40MPa, and the air intake rate is 3L / min. Nano sparkling water. Take 80mL of micro-nano bubble water and put it in a 250mL conical flask, according to the mass ratio MWCNTs:TiO 2 =26% Add 83.2mg of MWCNTs and 4mmol TiCl to the above-mentioned micro-nano bubble water successively 4 , Place the Erlenmeyer flask in a sonicator for ultrasonic treatment for 15 minutes to obtain a uniform dispersion. A dilute ammonia solution with a concentration of 2.6% was gradually added dropwise to the above dispersion liquid until a sol state appeared, and then the hydrolysis reaction was continued for 13 hours at a room temperature of 30° C. to obtain a hydrolyzed product. Add 0.018 mmol HAuCl to the resulting hydrolyzate 4 10 mL of micro-nano-bubble aqueous solu...

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Abstract

The invention provides a preparation method of a nano-gold-modified TiO2 / carbon nano-tube composite photocatalyst. The preparation method includes steps of: a) performing treatment to an alcohol watersolution and steady gas as mediums in a micron / nano-bubble generator to obtain micron / nano-bubble water; b) mixing and dispersing the micron / nano-bubble water, carbon nano-tubes and titanium salt toobtain a dispersion liquid; c) mixing and hydrolyzing the dispersion liquid with ammonia water solution to prepare a hydrolyzed product; d) mixing the hydrolyzed product with gold salt and the micron / nano-bubble water and successively performing photo-reduction and heating reaction to obtain a reaction product; e) carrying out thermal treatment to the reaction product to obtain the Au-TiO2-CNTs composite photocatalyst. The preparation method is simple and greatly simplifies the processes. The composite photocatalyst has stable combination and has effective and excellent catalytic degradation effect. Meanwhile, the preparation method is free of toxic and harmful organic solvents and template agents, thus greatly reducing cost and environment pollution.

Description

technical field [0001] The invention belongs to the technical field of air purification, in particular to a method for preparing a nano-gold modified titanium dioxide-carbon nanotube composite photocatalyst. Background technique [0002] At present, among air pollutants represented by typical volatile organic compounds (VOCs), many substances have carcinogenic and teratogenic effects, and a series of chronic diseases will occur after long-term exposure to the human body. Therefore, the effective control and elimination of typical VOCs has become one of the current research hotspots, especially the development of continuous, efficient and stable air purification technology, which is of great significance for energy saving and emission reduction, reducing the generation of toxic particulate matter, and effectively improving the living environment. [0003] Among them, photocatalytic oxidation technology can directly use visible light or sunlight to degrade VOCs under the actio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01D53/86B01D53/72
CPCB01D53/8668B01J23/52B01J35/004
Inventor 安太成张卫平刘宏利李桂英陈江耀
Owner GUANGDONG UNIV OF TECH
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