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Preparation method of black titanium dioxide B nanosheet with high oxygen vacancy content defects

A black titanium dioxide, nanosheet technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of wide band gap, low light utilization rate, etc., achieve uniform particle size, increase specific surface area, enhance The effect of photocatalytic effect

Active Publication Date: 2021-09-03
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

TiO2 nanosheets have attracted much attention due to their open cavities, parallel channels and higher specific surface area, which can expose more active sites, improve charge mobility, and high reusability, but their wide bandgap , the low utilization rate of light limits its application

Method used

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  • Preparation method of black titanium dioxide B nanosheet with high oxygen vacancy content defects
  • Preparation method of black titanium dioxide B nanosheet with high oxygen vacancy content defects
  • Preparation method of black titanium dioxide B nanosheet with high oxygen vacancy content defects

Examples

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Effect test

Embodiment 1

[0029] Add 2ml of titanium tetrachloride hydrochloric acid solution into 20ml of ethylene glycol, and stir evenly until the color of the solution is light brown. The obtained light brown solution was transferred to a 50ml reaction kettle, placed in a 150°C incubator, kept for 4 hours, and a white precipitate was obtained after cooling. Centrifuged, washed with ethanol, dried at 30°C for 10 hours, ground and placed in a porcelain ark, moved to a tube furnace, and annealed at 250°C for 2 hours under the protection of nitrogen to obtain a brown titanium dioxide B nanosheet sample.

Embodiment 2

[0031] Add 2ml of titanium tetrachloride hydrochloric acid solution into 20ml of ethylene glycol, and stir evenly until the color of the solution is light brown. The obtained light brown solution was transferred to a 50ml reaction kettle, placed in a 150°C incubator, kept for 4 hours, and a white precipitate was obtained after cooling. After centrifugation, washing with ethanol, drying at 30°C for 10 hours, grinding, putting into a porcelain ark, moving to a tube furnace, and annealing at 350°C for 2 hours under the protection of nitrogen to obtain black titanium dioxide B nanosheet samples. Take 20mg of black sample and place it in 20ml of 40mg / L RhB solution. After dark reaction for 30min, keep the supernatant for testing, then irradiate under simulated sunlight for 5min, 15min, 25min, 35min and keep the supernatant for testing.

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Abstract

The invention discloses a preparation method of black titanium dioxide B nanosheets with high-content oxygen vacancy defects. The preparation method comprises the following steps: by taking quantitative ethylene glycol as a solvent and a titanium tetrachloride hydrochloric acid solution as a titanium source, mixing and stirring until the solution becomes brown; putting the brown solution into a reaction kettle, putting the reaction kettle into a constant-temperature box at 150-180 DEG C, standing for 4-6 hours, and centrifugally washing, drying and grinding the obtained white titanium dioxide B precipitate for later use; and annealing the obtained white powder in inert gas at 250-350 DEG C for 2-3 hours to obtain the black titanium dioxide B nanosheet, and degrading organic dye by using the black titanium dioxide B nanosheet. The black titanium dioxide nanosheet aggregate prepared by the method has uniform granularity of 150-200 nm and epitaxial sheet thickness of 1-2 nm, high-content oxygen vacancy defects are obtained only through thermal decomposition of ethylene glycol molecules chemically adsorbed on the surface of the material, the method is mild and simple, and high temperature and high pressure and addition of an additional reducing agent are not needed.

Description

technical field [0001] The invention relates to a method for preparing black titanium dioxide B nanosheets with high content of oxygen vacancy defects, and belongs to the technical field of material synthesis. Background technique [0002] The method of introducing oxygen vacancies in the form of reduction, changing the color of titanium dioxide, narrowing the band gap of titanium dioxide and enhancing its light absorption is regarded as an effective means to improve the performance of titanium dioxide, especially the appearance of black titanium dioxide endows titanium dioxide with more research and practical Value (Science, 2011, 331, 746). Black titanium dioxide has the characteristics of uniform surface amorphization, wide light absorption range, more chemical defects, and enhanced electronic conductivity, which help to enhance its applications in photocatalysis, energy storage and conversion, etc. However, some of the existing methods for introducing oxygen vacancies r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82Y30/00B82Y40/00
CPCC01G23/0536B82Y30/00B82Y40/00C01P2004/03C01P2004/04C01P2002/72C01P2004/64C01P2006/60Y02W10/37
Inventor 郭林康建新张彦
Owner BEIHANG UNIV
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