A kind of immobilized f, n, ag co-doped titanium dioxide photocatalyst and its preparation method and application

A technology of photocatalyst and titanium dioxide, which is applied in the field of photocatalytic materials, can solve the problems of not much co-doping of metal elements and non-metal elements, restricting the popularization and application of photocatalytic technology, difficult to separate, recycle and recycle, etc., to achieve increased photocatalytic Reactive sites, improved photocatalytic efficiency, and good uniformity

Active Publication Date: 2021-11-23
SHENYANG INST OF AUTOMATION GUANGZHOU CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 There are also defects such as easy loss, easy agglomeration, difficulty in separation, recovery and recycling, and narrow optical response range, which seriously restricts the practical application of its photocatalytic technology.
[0003] In response to the above problems, one is to modify and dope titanium dioxide to improve its spectral response range. There have been a large number of research reports on the single doping of metal elements or non-metal elements, but the co-doping of metal elements and non-metal elements The second is to find an effective method to immobilize titanium dioxide. At present, the immobilization methods of titanium dioxide at home and abroad are mainly concentrated in dip coating method, sol-gel method, electrochemical deposition method and chemical vapor deposition method. method, etc., but there are few reports on the immobilization of titanium dioxide by hydrothermal method.

Method used

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  • A kind of immobilized f, n, ag co-doped titanium dioxide photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Soak the honeycomb ceramic sample in 10% dilute nitric acid solution for 1 hour, take it out, rinse it with deionized water, dry it in an oven at 80°C for 2 hours, put it in a muffle furnace for calcination at 300°C for 3 hours, and set it aside. Mix tetrabutyl titanate and absolute ethanol uniformly at a volume ratio of 1:2, slowly add 15% glacial acetic acid dropwise under continuous stirring at 700r / min, the volume is 1% of tetrabutyl titanate; then Then add a certain amount of ammonium fluoride solution and silver nitrate solution to the above solution under continuous stirring at 700r / min, so that the molar ratio of F element, N element, Ag element and Ti element in the solution is 1:1:0.01 : 0.5; then the spare honeycomb ceramics were immersed in the solution, and transferred to the hydrothermal reaction kettle, and hydrothermally reacted for 24h at 180°C. After the reaction was completed, the honeycomb ceramics were taken out, washed with deionized water and place...

Embodiment 2

[0030] Soak the honeycomb ceramic sample in 10% dilute sulfuric acid solution for 1 hour, take it out and rinse it with deionized water, then dry it in an oven at 80°C for 2 hours, put it in a muffle furnace for calcination at 800°C for 0.5 hour, and set it aside. Mix titanium tetrachloride and absolute ethanol uniformly at a volume ratio of 1:10, slowly add 10% dilute hydrochloric acid dropwise under continuous stirring at 700r / min, and the volume is 1% of tetrabutyl titanate; then Add a certain amount of ammonium fluoride solution and silver nitrate solution to the above solution under continuous stirring at 700r / min, so that the molar ratio of F element, N element, Ag element and Ti element in the solution is 1:1:0.02: 1; Then immerse the spare honeycomb ceramics in the solution, and transfer them to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 220°C for 8 hours. After the reaction is completed, take out the honeycomb ceramics, wash them with deioni...

Embodiment 3

[0032] Soak the copper foam sample in 10% dilute hydrochloric acid solution for 1 hour, take it out and rinse it with deionized water, then dry it in an oven at 80°C for 2 hours, put it in a muffle furnace for calcination at 600°C for 1 hour, and set it aside. Mix tetrabutyl titanate and absolute ethanol uniformly at a volume ratio of 1:20, slowly add 15% glacial acetic acid dropwise under continuous stirring at 700r / min, and the volume is 2% of tetrabutyl titanate; then Then add a certain amount of ammonium fluoride solution and silver nitrate solution to the above solution under the continuous stirring state of 700r / min, so that the molar ratio of F element, N element, Ag element and Ti element in the solution is 1:1:0.05 : 2; then the standby foamed copper is immersed in the solution, and transferred to the hydrothermal reaction kettle, hydrothermal reaction 12h at 200 ℃, after the reaction is completed, the foamed copper is taken out, washed with deionized water and placed ...

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Abstract

The invention belongs to the field of photocatalytic materials, and discloses an immobilized F, N and Ag co-doped titanium dioxide photocatalyst and a preparation method and application thereof. The preparation method of the photocatalyst comprises the following steps: (1) soaking the photocatalyst carrier in an acidic solution, then taking out, washing, drying and calcining for use; (2) mixing the titanium dioxide precursor and anhydrous ethanol uniformly, Add hydrolysis inhibitor dropwise under stirring, then add ammonium fluoride solution and silver nitrate solution to obtain a mixed solution; (3) immerse the photocatalyst carrier obtained in step (1) after calcining at high temperature in step (2) After the reaction is completed, the photocatalyst carrier in the hydrothermal reactor is taken out, washed and dried to obtain the immobilized photocatalyst. Compared with pure titanium dioxide, the obtained catalyst has obviously enhanced photocatalytic performance, the catalyst is firmly supported and not easy to fall off; and the preparation process of the invention is simple and the repeatability is good.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, in particular to an immobilized F, N, Ag co-doped titanium dioxide photocatalyst, its preparation method and application. Background technique [0002] With the development of modern society, environmental issues have become the focus of people's attention. TiO 2 Because of its non-toxic and harmless, cheap and easy to obtain, stable chemical properties, high catalytic activity, and strong oxidation ability, it has become a hot spot in the research of heterogeneous photocatalysis, and has broad application prospects in environmental pollution control. But TiO 2 There are also defects such as easy loss, easy agglomeration, difficulty in separation, recovery and recycling, and narrow optical response range, which seriously restrict the practical application of its photocatalytic technology. [0003] In response to the above problems, one is to modify and dope titanium dioxide to improve i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J21/06B01J37/02B01J37/08B01J37/10B01J35/10C02F1/30C02F101/38
Inventor 陈志鸿陈艳波孟庆国苑明哲吕海钦
Owner SHENYANG INST OF AUTOMATION GUANGZHOU CHINESE ACAD OF SCI
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