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Quantum dot TiO2 loaded SiO2 photocatalyst and preparation method thereof

A photocatalyst, quantum dot technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of separation and recovery difficulties, catalysts cannot be used continuously, and limited industrial value, etc. The effect of the application foreground

Inactive Publication Date: 2013-07-10
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But people are using powdered TiO 2 It was found that its small particles lead to the disadvantages that the catalyst cannot be used continuously, and the separation and recovery are difficult, which seriously limits its industrial application value.

Method used

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  • Quantum dot TiO2 loaded SiO2 photocatalyst and preparation method thereof
  • Quantum dot TiO2 loaded SiO2 photocatalyst and preparation method thereof
  • Quantum dot TiO2 loaded SiO2 photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The first step is to prepare the silica macroporous foam carrier: add 2.0g of P123 into 75mL of 1.6mol / L HCl solution, stir at 40°C water bath temperature to completely dissolve P123, then add 2.0g of 1,3,5 -Trimethylbenzene and 23mg of ammonium fluoride, stirred for 45min to form a milky white turbid solution; weighed 4.4g of ethyl orthosilicate, added dropwise to the above solution, continued to stir for 20h, then transferred the solution to a hydrothermal kettle , kept at 100°C for 24h and then cooled to room temperature naturally. After washing with deionized water and suction filtration, the dried white powder was calcined at 500°C for 8 hours to obtain a silicon oxide large-pore foam material.

[0032] The second step is to prepare quantum dots TiO 2 load SiO 2 Photocatalyst: Disperse 0.28g of tetrabutyl titanate into 70mL ethanol solvent, stir to fully dissolve tetrabutyl titanate, then add 0.5g of synthesized silicon oxide foam template, and stir for 1h (mole ...

Embodiment 2

[0034] The first step is to prepare the silica macroporous foam carrier: the preparation method is the same as the first step in Example 1.

[0035] The second step is to prepare quantum dots TiO 2 load SiO 2 Photocatalyst: Disperse 0.57g of tetrabutyl titanate into 70mL of ethanol solvent, stir to fully dissolve tetrabutyl titanate, then add 0.5g of synthesized silicon oxide foam template, and stir for 1h (mole of Ti and Si The ratio is 20%), so that tetrabutyl titanate molecules can be adsorbed on the pores and surfaces of silica. 10 mL of H was added dropwise with stirring 2 O, reacted for 2h, centrifuged the synthesized sample, washed 4-5 times with absolute ethanol, and baked the dried sample at 500°C for 3h to prepare the quantum dot TiO we needed 2 load SiO 2photocatalyst material.

Embodiment 3

[0037] The first step is to prepare the silica macroporous foam carrier: the preparation method is the same as the first step in Example 1. The second step is to prepare quantum dots TiO 2 load SiO 2 Photocatalyst: Disperse 0.85g of tetrabutyl titanate into 70mL ethanol solvent, stir to fully dissolve tetrabutyl titanate, then add 0.5g of synthesized silicon oxide foam template, and stir for 1h (mole of Ti and Si The ratio is 30%), so that tetrabutyl titanate molecules can be adsorbed on the pores and surfaces of silica. 10 mL of H was added dropwise with stirring 2 O, reacted for 2h, centrifuged the synthesized sample, washed 4-5 times with absolute ethanol, and baked the dried sample at 500°C for 3h to prepare the quantum dot TiO we needed 2 load SiO 2 photocatalyst material.

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Abstract

The invention discloses a quantum dot TiO2 loaded SiO2 photocatalyst and a preparation method thereof. The quantum dot TiO2 loaded SiO2 photocatalyst is prepared by two steps: 1, synthesizing a large-aperture SiO2 foam loading body; and 2, hydrolyzing tetrabutyl titanate by a method for hydrolyzing in a pore channel and loading TiO2 into the pore channel of the foam SiO2 to prepare the quantum dot TiO2 loaded SiO2 photocatalyst. The loading body SiO2 material adopts a large-aperture foam pore channel structure; the TiO2 is below 5 nm, has quantum dot size and is uniformly dispersed in the SiO2 pore channel; and the specific surface area is 431 m<2> / g, the pore volume is 1.20 cm<3> / g, and the aperture is about 11.1 nm. The quantum dot TiO2 loaded SiO2 photocatalyst is a photic transparent body and can disperse less ultraviolet light, and the special pore channel can effectively separate a photogenerated electron hole, so the quantum dot TiO2 loaded SiO2 photocatalyst is an ideal loading body. The macroporous material is favorable for the loading of macromolecular substances and dispersion of reaction substrates in the pore channel due to large aperture and pore volume and the special window connecting structure.

Description

technical field [0001] The present invention relates to a SiO 2 Photocatalyst and preparation method thereof, specifically a kind of highly dispersed quantum dot TiO 2 load SiO 2 Photocatalyst and its preparation method. It belongs to the technical field of photocatalyst. Background technique [0002] Human beings' concerns about future energy shortages and requirements for environmental protection have greatly promoted people's research on photo-splitting water. According to reports, according to the current consumption rate, oil will be exhausted in less than 100 years, and coal can only last for about 200 years, and the use of fossil energy such as oil will cause serious pollution to the environment. Therefore, research and discussion on future energy production It seems very urgent. [0003] Hydrogen energy is the best pollution-free green energy. Solar energy is an inexhaustible and inexhaustible natural resource, so using solar energy to photolyze water to produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08C01B3/04
CPCY02E60/36
Inventor 李鑫钟文涛张蝶青李贵生李和兴
Owner SHANGHAI NORMAL UNIVERSITY