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A kind of multi-defect multi-doped titanium dioxide nanoparticles with high visible light catalytic activity and preparation method

A technology of titanium dioxide and catalytic activity, which is applied in the field of preparation of titanium dioxide nano-photocatalysts, can solve the problems of low quantum efficiency of titanium dioxide, and achieve the effect of improving photocatalytic activity, improving catalytic performance, and simple synthesis method

Active Publication Date: 2019-08-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology can solve the existing problems of low quantum efficiency of titanium dioxide and surface reduction technology

Method used

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  • A kind of multi-defect multi-doped titanium dioxide nanoparticles with high visible light catalytic activity and preparation method
  • A kind of multi-defect multi-doped titanium dioxide nanoparticles with high visible light catalytic activity and preparation method
  • A kind of multi-defect multi-doped titanium dioxide nanoparticles with high visible light catalytic activity and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 0.5583g of ammonium hexafluorotitanate and dissolve it in 2ml of deionized water and 3ml of acetic acid, add it dropwise to the mixture of 4ml of tetrabutyl titanate and 20ml of isopropanol during vigorous stirring, and continue stirring in ice bath for 5h , transferred to a 50ml reactor, and heated at 180°C for 5h. Cool to room temperature, wash with ethanol and deionized water, and dry under vacuum at 60 °C to obtain NH 4 TiOF 3 with TiO 2 The mixture, denoted as NTT. Disperse 0.5g NTT into 50ml 0.5mol / l boric acid solution, stir in water bath at 40°C for different times to obtain NH with different conversion degrees 4 TiOF3 and TiO 2 composite nanomaterials. It is recorded as NTT-x (wherein x=0, 2, 5 hours) according to the different stirring time in the water bath. Disperse NTT-x in absolute ethanol, and exhaust the air with argon. Irradiate with a xenon lamp for 1 h, and keep bubbling argon gas during the process to keep the temperature of ethanol close...

Embodiment 2

[0035] Dissolve 0.5583g of ammonium hexafluorotitanate in 5ml of deionized water and 5ml of acetic acid, and add it dropwise to a mixture of 4ml of tetrabutyl titanate and 20ml of isopropanol during vigorous stirring. A small amount of gel was formed, and the mixture was stirred in an ice bath for 5 hours, transferred to a 50ml reaction kettle, and heated in water at 180°C for 5 hours. Cool to room temperature, wash with ethanol and deionized water, and dry under vacuum at 60 °C to obtain NH 4 TiOF 3 with TiO 2 The mixture is denoted as NTT. Disperse 0.5g of NTT into 80ml of 0.5mol / l boric acid solution, stir in a water bath at 40°C for 5 hours to obtain TiO 2 Nanomaterials are denoted as NTT-5. Disperse NTT-5 in absolute ethanol, and exhaust the air with argon. Irradiate with a xenon lamp for 1 h, and keep bubbling argon gas during the process to keep the temperature of ethanol close to the boiling point. The samples were taken out and dried at 80°C. This process is re...

Embodiment 3

[0037] Take 0.5583g of ammonium hexafluorotitanate and dissolve it in 1ml of deionized water and 4ml of acetic acid, add it dropwise to the mixture of 4ml of tetrabutyl titanate and 20ml of isopropanol during vigorous stirring, and continue stirring in an ice bath for 5h , transferred to a 50ml reactor, and heated at 180°C for 5h. Cool to room temperature, wash with ethanol and deionized water, and dry under vacuum at 60 °C to obtain NH 4 TiOF 3 with TiO 2 The mixture is denoted as NTT. Disperse 0.5g of NTT into 80ml of 0.5mol / l boric acid solution, stir in a water bath at 40°C for 5 hours to obtain TiO 2 Nanomaterials are denoted as NTT-5. Disperse NTT-5 in absolute ethanol, and exhaust the air with argon. Irradiate with a xenon lamp for 1 h, and keep bubbling argon gas during the process to keep the temperature of ethanol close to the boiling point. The samples were taken out and dried at 80°C. This process is repeated 4 times. The final sample is light yellow, which...

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Abstract

The invention discloses a multi-defect multi-doped titanium dioxide nanoparticle with high visible light catalytic activity and a preparation method. The titanium dioxide has a size of 10 to 20 nanometers, a particle diameter of 10 to 20 nanometers, and a specific surface area of ​​140 to 160 cm. 3 , truncated octahedral nanoparticles where {001} and {101} planes coexist. The preparation method is to first use tetrabutyl titanate and ammonium hexafluorotitanate as titanium source and fluorine source respectively, and synthesize TiO by hydrothermal method. 2 and NH 4 TIOF 3 mixture, the prepared sample was further treated with boric acid, NH 4 TIOF 3 It undergoes a topological transformation process and is converted into titanium dioxide while achieving in-situ doping of a small amount of nitrogen to obtain titanium dioxide with exposed {001} crystal planes. Then the photoreduction method is used to introduce a large number of defects on the surface of titanium dioxide and achieve fluorine doping at the same time. The oxygen defects introduced in the present invention can significantly improve the absorption of visible light by titanium dioxide. At the same time, the exposure of {001} crystal planes and the co-doping of nitrogen and fluorine atoms improve the separation of carriers during the photocatalytic process. This enables it to efficiently degrade rhodamine B under visible light irradiation.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide catalysts, and relates to the preparation of a nitrogen-fluorine co-doped titanium dioxide nano photocatalyst with a large number of surface defects, which can be used for photocatalytic degradation of organic pollutants under visible light. Background technique [0002] Anatase phase TiO 2 Due to its high catalytic efficiency, stable chemical properties, strong oxidation ability, and no secondary pollution, nanomaterials have become the most popular and widely used photocatalysts, and have been widely used in self-cleaning, solar cells, manufacturing Hydrogen, degraded organic matter, supercapacitors, gas sensors and other different application fields. However, in the process of photocatalysis, on the one hand, the photogenerated electron-hole pairs are very easy to recombine, and on the other hand, the band gap of titanium dioxide is relatively large, so only ultraviolet light with a w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J27/24
CPCB01J21/063B01J27/24B01J37/16B01J35/50B01J35/39B01J35/40
Inventor 谭振权康晓兰宋学志韩英
Owner DALIAN UNIV OF TECH
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