Method for preparing homogeneous boron/nitrogen-doped red titanium dioxide

A titanium dioxide and boron doping technology is applied in the field of doping preparation of photocatalytic materials, which can solve the problems of inability to achieve strong absorption of visible light, and achieve the effects of improving the application potential of photocatalysis, low environmental pollution and high light absorption.

Active Publication Date: 2019-07-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing boron-nitrogen homogeneous boron-nitrogen-doped red titanium dioxide, which can effectively expand the boron-nitrogen co-doping of titanium dioxide photocatalytic materials in the visible light absorption range, and solve the problem that the existing preparation methods cannot achieve the overall intensity of visible light. absorption problem

Method used

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  • Method for preparing homogeneous boron/nitrogen-doped red titanium dioxide
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  • Method for preparing homogeneous boron/nitrogen-doped red titanium dioxide

Examples

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Embodiment 1

[0037] In this example, boron-doped anatase titanium dioxide microspheres are used as the starting material, and the absorption spectra of the samples prepared at different processing temperatures are studied.

[0038] Put the boron-doped anatase titanium dioxide microsphere sample and urea in a mass ratio of 3:1, place it in a quartz boat and cover it, firstly purge with argon gas at room temperature for 20 minutes, then keep the flow rate of argon gas constant, According to the program, the temperature is raised to a specific temperature of 340°C, 380°C, 460°C, and 560°C, followed by heat preservation for 2 hours.

[0039] Absorption spectrum testing equipment: UV-visible spectroscopy, JASCO-770, measured in diffuse reflectance mode. figure 1 The absorption spectra of the obtained samples treated at different temperatures are given. It can be seen from the figure that compared with the original titanium dioxide sample, the visible light absorption modification effect of the...

Embodiment 2

[0041] The difference from Example 1 is that in this example, boron-doped anatase titanium dioxide microspheres are used as the starting material, and the absorption spectra of the samples prepared at 460° C. for different time are studied.

[0042] Absorption spectrum test condition is the same as embodiment 1. figure 2 The absorption spectra of the samples obtained after the samples were treated for 2h, 5h, and 10h are given. It can be seen from the figure that the processing time has an effect on the visible light absorption ability of the doping improved material. Under this temperature condition, the visible light absorption performance of the sample obtained by incubating for 5h is the best.

Embodiment 3

[0044] The difference from Example 1 is that this example uses boron-doped anatase titanium dioxide microspheres as the starting material, and studies the absorption spectra of samples prepared under different urea dosages.

[0045] The absorption spectrum test conditions are the same as in Example 1, and the amount of boron-doped anatase titanium dioxide microspheres is 100 mg. image 3 The absorption spectra of samples obtained by using 200mg, 300mg, and 400mg urea as doped nitrogen sources are given respectively. It can be seen from the figure that under the same treatment temperature and time conditions, the more doped nitrogen source is used, the higher the concentration of local doped active nitrogen atoms will be, resulting in a more obvious red shift of the visible light absorption edge of the sample.

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Abstract

The invention relates to the technology of doped preparation of photocatalytic materials, in particular to a method for preparing homogeneous boron/nitrogen-doped red titanium dioxide. The method comprises specific steps as follows: nitrogen-containing decomposable solid organic matter is used as a doping nitrogen source, boron-doped titanium dioxide and the nitrogen source are placed in a sampledevice to provide a relatively airtight doping environment, homogenous boron/nitrogen doping of titanium dioxide is realized by controlling heating temperature and treatment time, so that overall redshift of titanium dioxide light absorption edges is realized, the obtained boron/nitrogen-doped titanium dioxide photocatalysis material has high absorbance in the whole visible light range, and the photocatalytic application potential of the material is enhanced significantly.

Description

technical field [0001] The invention relates to a doping preparation technology of photocatalytic materials, in particular to a method for preparing boron-nitrogen homogeneous boron-nitrogen doped red titanium dioxide. Background technique [0002] Photocatalytic technology can convert solar energy into chemical energy, such as photocatalytic water splitting technology, which is an effective way to use solar energy to obtain new energy. The realization of photocatalytic technology depends on the development of photocatalytic materials that can efficiently absorb visible light. Anatase titanium dioxide is the most widely studied photocatalytic material so far due to its remarkable advantages of high stability, non-toxicity and low cost. However, the band gap of anatase titanium dioxide is 3.2eV, which can only absorb ultraviolet light with a wavelength lower than 400nm, which accounts for only 4% of sunlight, but cannot be used for visible light (400-700nm), which accounts f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J21/06B01J35/08
CPCB01J27/24B01J21/063B01J35/004B01J35/08Y02E60/36
Inventor 刘岗洪星星成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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