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Preparation method of TiO2 (titanium dioxide) mesoporous monocrystal microsphere and g-C3N4 heterojunction photocatalyst

A photocatalyst, g-c3n4 technology, applied in the field of photocatalytic materials, can solve the problems of difficult to precisely control the composition and structure, unable to make full use of the visible light part, uneven distribution of each phase, etc., to achieve good photocatalytic degradation of pollutants and Photocurrent response performance, high application prospect and practical value, the effect of cheap raw materials

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 a small amount of photogenerated carriers eventually migrate to the surface to participate in the reaction, resulting in low photon quantum efficiency.
In the prior art, high-temperature calcination is usually used to prepare g-C3N4 composite photocatalysts. The disadvantages are that it is difficult to accurately control the composition and structure, and the distribution of each phase is uneven.

Method used

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  • Preparation method of TiO2 (titanium dioxide) mesoporous monocrystal microsphere and g-C3N4 heterojunction photocatalyst
  • Preparation method of TiO2 (titanium dioxide) mesoporous monocrystal microsphere and g-C3N4 heterojunction photocatalyst
  • Preparation method of TiO2 (titanium dioxide) mesoporous monocrystal microsphere and g-C3N4 heterojunction photocatalyst

Examples

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Embodiment 1

[0025] 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 1mmol, placed in 50ml concentration of 5 × 10 -6 mol / L TiCl 4 In the seed solution, keep the temperature in a water bath at 60° C. for 2 hours, and then centrifuge and dry the samples for later use. The above pre-seeded g-C 3 N 4 With 0.1ml sulfuric acid concentration of 0.5mol / L TiOSO 4 solution (TiOSO 4 1mol / L) and 50ml of water were transferred into the autoclave, sealed and placed in a blast drying oven at 100°C for 48 hours. After the reaction, the powder was filtered out, rinsed with deionized water and ethanol, and dried to obtain TiO 2 Mesoporous single crystal microspheres and g-C 3 N 4 The heterojunction photocatalyst is denoted as mpsT-gCN-1. Us...

Embodiment 2

[0027] 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 N4 . Take g-C 3 N 4 Powder 1mmol, placed in 100ml concentration of 1 × 10 -5 mol / L seed crystal solution, the temperature was maintained in a water bath at 60°C for 1 h, and then the samples were centrifuged and dried for later use. The above pre-seeded g-C 3 N 4 With 0.5ml sulfuric acid concentration is the TiOSO of 0.4mol / L 4 solution (TiOSO 4 1mol / L) and 50ml of water into the autoclave, sealed and placed in a blast drying oven at 110°C for 36h. After the reaction, the powder was filtered out, rinsed with deionized water and ethanol, and dried to obtain TiO 2 Mesoporous single crystal microspheres and g-C 3 N 4 The heterojunction photocatalyst is denoted as mpsT-gCN-2. Using methyle...

Embodiment 3

[0029] 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 1mmol, placed in 100ml concentration of 3 × 10 -5 mol / L seed crystal solution, keep the temperature in a water bath at 70°C for 1 h, and then centrifuge and dry the samples for later use. The above pre-seeded g-C 3 N 4 With 1ml sulfuric acid concentration of 0.3mol / L TiOSO 4 solution (TiOSO 4 1mol / L) and 50ml of water into the autoclave, sealed and placed in a blast drying oven at 110°C for 48h. After the reaction, the powder was filtered out, rinsed with deionized water and ethanol, and dried to obtain TiO 2 Mesoporous single crystal microspheres and g-C 3 N 4 The heterojunction photocatalyst is denoted as mpsT-gCN-3. Using methylene blue (MB) as the targe...

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Abstract

The invention discloses a preparation method of a TiO2 (titanium dioxide) mesoporous monocrystal microsphere and g-C3N4 heterojunction photocatalyst and belongs to the technical field of photocatalysis materials. The method comprises the following steps: putting g-C3N4 into a TiO2 seed crystal solution, and performing water bath treatment in water with the temperature of 60-90 DEG C to plant a seed crystal; adding g-C3N4 and a TiO2 precursor solution for preplanting the seed crystal into one of water, isopropanol or tertiary butanol, and performing solvent heat treatment at the temperature of 100-120 DEG C to obtain the TiO2 mesoporous monocrystal microsphere and g-C3N4 heterojunction photocatalyst. The TiO2 mesoporous monocrystal microsphere and g-C3N4 heterojunction photocatalyst provided by the invention has good photocatalytic pollutant degradation performance and photocurrent response performance; the preparation method has the advantages that the material is low in price, the process is simple and the structure is controllable; 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 Mesoporous single crystal microspheres and g-C 3 N 4 The invention discloses a method for preparing a heterojunction photocatalyst, belonging to the technical field of photocatalytic materials. Background technique [0002] TiO with mesoporous structure 2 Single crystals and their superstructures have both high specific surface area and excellent electron transport properties. They have become a hot spot in the field of photocatalysis and solar photoelectric conversion in recent years. In the field of photocatalysis, they can be used for deodorization, antibacterial, decolorization and Self-cleaning etc. But TiO 2 It is still insufficient in terms of photocatalytic efficiency and utilization of visible light, especially the latter restricts TiO 2 Practical engineering applications of photocatalytic technology. TiO 2 The band gap (E g ) is 3.2eV, and the corresponding light absorption band edge i...

Claims

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Application Information

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IPC IPC(8): B01J27/24
Inventor 李永利王金淑杨亦龙张燕
Owner BEIJING UNIV OF TECH
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