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Preparation method of TiO2(B)@g-C3N4 composite nano-sheet photocatalyst

A photocatalyst, g-c3n4 technology, applied in the field of photocatalytic materials, can solve the problems of low utilization efficiency of photogenerated carriers, difficult to precisely control the composition and structure, uneven distribution of each phase, etc., and achieve good photocatalytic degradation of organic Pollutant and photocurrent response performance, high application prospect and practical value, the effect of simple process

Active Publication Date: 2014-04-23
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO 2 The band gap (E g ) is 3.2eV, and the corresponding light absorption band edge is 387nm, which can only be excited by less than 5% of the ultraviolet radiation in the solar spectrum, and cannot make full use of the visible light part of the solar energy; on the other hand, TiO 2 The probability of photoinduced electron-hole recombination is very high, and only about 1% of excitons eventually migrate to the surface to participate in the reaction, resulting in low utilization efficiency of photogenerated carriers.
The prior art usually adopts high temperature calcination to prepare g-C 3 N 4 Composite photocatalyst, the disadvantage is that it is difficult to precisely control the composition and structure, and the distribution of each phase is uneven

Method used

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  • Preparation method of TiO2(B)@g-C3N4 composite nano-sheet photocatalyst

Examples

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experiment example 1

[0024] Take 10g of urea and place it in a crucible, wrap the crucible tightly with aluminum foil, place it in a muffle furnace and calcinate at 550°C in an air atmosphere with a heating rate of 10°C / min, keep it warm for 4 hours and then cool it naturally, the obtained powder is g-C 3 N 4 . Take g-C 3 N 4 Powder 0.1g, with 0.2ml TiCl 4 , 30ml of ethylene glycol, and 1mL of concentrated ammonia water to make a slurry, stir in a water bath at 60°C for 2 hours, transfer it into an autoclave after the heat preservation is completed, and put it in a forced air drying oven for 48 hours at 140°C. After the reaction, the powder was filtered out, rinsed with deionized water and ethanol, and dried to obtain TiO 2 (B)g-C 3 N 4 Composite nanosheet photocatalyst, denoted as CNTO-1. Using methylene blue (MB) as the target degradation product, take TiO 2 (B)g-C 3 N 4 Add 50 mg of composite nanosheet photocatalyst (CNTO-1) into 50 ml of MB solution with a concentration of 10 mg / L. A...

experiment example 2

[0026] Take 10g of urea and place it in a crucible, wrap the crucible tightly with aluminum foil, place it in a muffle furnace and calcinate at 550°C in an air atmosphere with a heating rate of 15°C / min, keep it warm for 4 hours and then cool it naturally, the obtained powder is g-C 3 N 4 . Take g-C 3 N 4 Powder 0.1g, with 0.5ml TiCl 4 , 40ml of ethylene glycol, and 2mL of concentrated ammonia water to make a slurry, stir in a water bath at 60°C for 1h, transfer it into an autoclave after the heat preservation is completed, and put it in a forced air drying oven for 36h at 140°C. After the reaction, the powder was filtered out, rinsed with deionized water and ethanol, and dried to obtain TiO 2 (B)g-C 3 N 4 Composite nanosheet photocatalyst, denoted as CNTO-2. Using methylene blue (MB) as the target degradation product, take TiO 2(B)g-C 3 N 4 Add 50 mg of composite nanosheet photocatalyst (CNTO-2) into 50 ml of MB solution with a concentration of 10 mg / L, ultrasonicat...

experiment example 3

[0028] Take 10g of urea and place it in a crucible, wrap the crucible tightly with aluminum foil, place it in a muffle furnace and calcinate at 550°C in an air atmosphere with a heating rate of 20°C / min, keep it warm for 4 hours and then cool it naturally, the obtained powder is g-C 3 N 4 . Take g-C 3 N 4 Powder 0.1g, with 1ml TiCl 4 , 35ml of ethylene glycol, and 2mL of concentrated ammonia water to make a slurry, stir in a water bath at 70°C for 1h, transfer it into an autoclave after the heat preservation is completed, and put it in a forced air drying oven for 24h at 150°C. After the reaction, the powder was filtered out, rinsed with deionized water and ethanol, and dried to obtain TiO 2 (B)g-C 3 N 4 Composite nanosheet photocatalyst, denoted as CNTO-3. Using methylene blue (MB) as the target degradation product, take TiO 2 (B)g-C 3 N 4 Add 50 mg of composite nanosheet photocatalyst (CNTO-3) into 50 ml of MB solution with a concentration of 10 mg / L, ultrasonicate...

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Abstract

The invention provides a preparation method of a TiO2(B)@g-C3N4 composite nano-sheet photocatalyst, which belongs to the technical field of a photo-catalysis material. The method comprises the following steps: (1) mixing g-C3N4 with TiO2 sol, stirring in a constant-temperature water bath being 60-90 DEG C; and (2) carrying out solvent thermal treatment on the slurry at 140-180 DEG C, so as to obtain the TiO2(B)@g-C3N4 composite nano-sheet photocatalyst. The TiO2(B)@g-C3N4 composite nano-sheet provided by the invention has excellent performance of degrading pollutant by photo-catalysis and excellent photo current response property; the preparation method provided by the invention has the characteristics of cheap raw materials, simple process, controllable structure, and the like; and the prepared photocatalyst has very high application prospect and practical value in sewage treatment and air treatment.

Description

technical field [0001] The present invention relates to a kind of TiO 2 (B)g-C 3 N 4 The invention discloses a method for preparing a composite nanosheet photocatalyst, belonging to the technical field of photocatalytic materials. Background technique [0002] Nano-TiO 2 Photocatalyst is the most eye-catching category of photocatalytic materials. It has the advantages of high efficiency, stable chemical properties, non-toxic and harmless, and low cost. It has been the main research object in the field of photocatalysis and photoelectric conversion for more than 40 years since its discovery. , is also the most promising photocatalytic material for large-scale practical application, which can be used for deodorization, antibacterial, decolorization and self-cleaning under sunlight or indoor light. But nano TiO 2 It is still insufficient in terms of photocatalytic efficiency and utilization of visible light, especially the latter restricts TiO 2 Practical engineering appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24A62D3/17
Inventor 王金淑李永利杨亦龙张燕
Owner BEIJING UNIV OF TECH
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