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Method for preparing boron-doped titanium dioxide crystal containing specific crystal plane

A titanium dioxide and boron doping technology, applied in the field of photocatalytic materials, can solve the problems of not having high reaction selectivity and high visible light activity, and achieve high photocatalytic reaction selectivity, high visible light absorbance, and obvious advantages

Active Publication Date: 2012-02-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing boron-doped titanium dioxide crystals containing specific crystal faces, which can solve the shortcomings of general photocatalytic materials that do not have high reaction selectivity and high visible light activity

Method used

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  • Method for preparing boron-doped titanium dioxide crystal containing specific crystal plane
  • Method for preparing boron-doped titanium dioxide crystal containing specific crystal plane
  • Method for preparing boron-doped titanium dioxide crystal containing specific crystal plane

Examples

Experimental program
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Embodiment 1

[0032] Weigh 80mg of commercial titanium boride powder (in this embodiment, the particle distribution range of titanium boride powder is 500nm-10μm, chemical formula TiB x , x=2), put it into 15mL containing 1.3M H + (In this example, H + Use H 2 SO 4 ), 0.8M SO 4 2- (In this embodiment, SO 4 2- Using Na 2 SO 4 ) in a 100mL stainless steel reactor lined with polytetrafluoroethylene. After the reaction kettle was sealed, it was put into an oven for heat treatment at 180°C for 24 hours, the reaction sample was taken out, washed with deionized water and dried at 80°C to obtain anatase titanium dioxide microspheres whose surface was mainly composed of {001} crystal facets. Treated in an air atmosphere at 600°C for 2 hours, the boron-doped anatase titanium dioxide rich in {001} crystal planes was obtained, and the {001} crystal planes accounted for more than 90%. In this embodiment, in the boron-doped titanium dioxide crystal, the doping amount of boron is 0.3 at%.

[00...

Embodiment 2

[0037]Weigh 200 mg of commercial titanium boride powder without any treatment (in this embodiment, the average particle size of titanium boride powder is 1000nm, chemical formula TiB x , x=1), put it into 20mL containing 2M H + (In this example, H + Using HCl), 2MCl - (In this embodiment, Cl - Adopt the water of KCl), ethanol mixed solution (water, ethanol volume ratio is 8: 1), in the 80mL stainless steel reaction kettle with polytetrafluoroethylene as lining. After the reactor was sealed, put it into an oven for heat treatment at 150°C for 24 hours, take out the reaction sample, wash it with deionized water and dry it at 80°C, and then heat-treat it in air at 700°C for 2 hours to obtain boron-doped and {111}-rich In the rutile titanium dioxide crystal with crystal plane, the {111} crystal plane accounts for more than 95%. In the boron-doped titanium dioxide crystal in this embodiment, the doping amount of boron is 0.4 at%.

[0038] Such as Figure 4 As shown, the prepa...

Embodiment 3

[0041] Weigh 350mg of commercial titanium boride powder without any treatment (in this embodiment, the particle distribution range of titanium boride powder is 500nm-10μm, chemical formula TiB x , x=2), put it into a container containing 50mL of 3M H + (In this example, H + Using HCl), 0.33M SO 4 - , 0.9MCl - (In this embodiment, Cl - Using NaCl, SO 4 2- Using Na 2 SO 4 ) in a 200mL stainless steel reactor lined with polytetrafluoroethylene. After the reaction kettle was sealed, it was placed in an oven for heat treatment at 200°C for 5 hours, and the reaction sample was taken out, washed with deionized water and dried at 80°C, and heat-treated at 500°C for 6 hours under a nitrogen atmosphere to obtain boron-doped anatase titanium dioxide crystals. Its surface is mainly composed of a high proportion of {101} crystal planes and a small proportion of {001} crystal planes, with {101} crystal planes accounting for 80% and {001} crystal planes accounting for 20%. In the b...

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Abstract

The invention relates to the field of photocatalysis materials, in particular to a method for preparing a boron-doped titanium dioxide crystal containing a specific crystal plane. The method comprises the following steps of: loading titanium boride serving as a precursor into a reaction kettle of an acid solution containing different anions; sealing the reaction kettle; putting the reaction kettle into a baking oven for heating; taking a reaction sample out; washing with deionized water and drying to obtain a boron-doped titanium dioxide crystal containing a specific crystal plane in an acid system containing anions; and further thermally treating the boron-doped titanium dioxide crystal under different atmospheres, adjusting the distribution of boron in the crystal, and introducing a newheteroatom. In the invention, the boron-doped titanium dioxide crystal can be directly prepared by taking the titanium boride as the precursor and taking the anions as a morphology control agent, andthe surface of the boron-doped titanium dioxide crystal consists of an identifiable crystal plane, so that effective adjustment and control of the electronic structure of the photocatalysis material are effectively realized, and the defects of poor reaction selectivity and unavailable invisible light activity of the photocatalysis material are overcome.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, specifically a method for preparing boron-doped titanium dioxide crystals containing specific crystal planes, through a hydrothermal process, using titanium boride as a precursor and anion as a shape control agent to directly prepare boron-doped TiO2 crystals, the subsequent atmosphere treatment regulates the distribution of boron and introduces new heteroatoms. Background technique [0002] Titanium dioxide photocatalytic materials have many advantages such as high efficiency, low cost, high photostability, and environmental friendliness. , matrix materials for dye-sensitized solar cells, etc., have good commercial value. However, as a photocatalytic material, titanium dioxide also has its disadvantages. One is poor photocatalytic reaction selectivity; the other is no visible light absorption. The former limits its application in directional reactions, and the latter makes it only work ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J27/24B01J37/08
Inventor 刘岗成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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