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Carbon quantum dot and titanium codoped mesoporous silica composite photocatalyst

A technology of mesoporous silica and mesoporous silica, applied in the field of photocatalysis, achieves high specific surface area, convenient operation and reduced production cost

Inactive Publication Date: 2016-04-06
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on the design of photocatalysts based on carbon quantum dots, and there are basically no reports on the preparation of high-efficiency photocatalysts by combining carbon quantum dots with mesoporous silica materials.

Method used

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  • Carbon quantum dot and titanium codoped mesoporous silica composite photocatalyst
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  • Carbon quantum dot and titanium codoped mesoporous silica composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 1.33g of P123, 1.467g of chloride in a 100ml three-neck flask, dissolve in 20ml of 4M hydrochloric acid solution, add 20ml of deionized water, stir vigorously with mechanical stirring for 3 hours at 38°C to dissolve, reduce the stirring speed to avoid a large number of bubbles, A mixed solution of 3ml tetraethyl orthosilicate, 200ul carbon quantum dots and 20ul tetrabutyl titanate was added, stirred for another two minutes, and left to stand at 38°C for 24h. Transfer to a tetrafluoroethylene hydrothermal kettle, heat at 100°C for 24 hours, cool, filter and wash with water, wash with water three times, and dry in a vacuum oven at 60°C for 12 hours to obtain a sample. After the template agent is extracted, the sample is placed in a tube furnace, and the temperature is programmed to rise in a nitrogen atmosphere at a rate of 1°C / min, and it is calcined at 450°C for four hours, and then cooled naturally to obtain carbon quantum dots and titanium co-doping mesoporous s...

Embodiment 2

[0031] Weigh 1.33g of P123, 1.467g of chloride in a 100ml three-neck flask, dissolve in 20ml of 4M hydrochloric acid solution, add 20ml of deionized water, stir vigorously with mechanical stirring for 3 hours at 38°C to dissolve, reduce the stirring speed to avoid a large number of bubbles, Add 3ml tetraethyl orthosilicate, 200ul carbon quantum dots mixed solution, stir for two minutes, and let stand at 38°C for 24h. Transfer to a tetrafluoroethylene hydrothermal kettle, heat at 100°C for 24 hours, cool, filter and wash with water, wash with water three times, and dry in a vacuum oven at 60°C for 12 hours to obtain a sample. After the template agent is extracted, the sample is placed in a tube furnace, and the temperature is programmed to rise in a nitrogen atmosphere at a rate of 1°C / min, and it is calcined at 450°C for four hours, and then cooled naturally to obtain carbon quantum dot-doped mesoporous pores. Silica composite photocatalyst.

Embodiment 3

[0033] Weigh 1.33g of P123, 1.467g of chloride in a 100ml three-neck flask, dissolve in 20ml of 4M hydrochloric acid solution, add 20ml of deionized water, stir vigorously with mechanical stirring for 3 hours at 38°C to dissolve, reduce the stirring speed to avoid a large number of bubbles, A mixed solution of 3ml of tetrabutyl titanate and 3ml of tetrabutyl titanate was added, stirred for another two minutes, and left to stand at 38°C for 24h. Transfer to a tetrafluoroethylene hydrothermal kettle, heat at 100°C for 24 hours, cool, filter and wash with water, wash with water three times, and dry in a vacuum oven at 60°C for 12 hours to obtain a sample. After extracting the template agent, the sample was placed in a tube furnace, and the temperature was raised under a nitrogen atmosphere at a rate of 1°C / min, then raised to 450°C for four hours and then cooled naturally to obtain titanium-doped mesoporous silica. composite photocatalyst.

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Abstract

The invention relates to a carbon quantum dot and titanium codoped mesoporous silica composite photocatalyst and a preparation method thereof. The method is mainly characterized by comprising the following steps: simultaneously introducing carbon quantum dots and a titanium source in the process of synthesizing an ordered mesoporous silica material by using an in-site loading method, removing a template agent by using a solvent extraction method, and subjecting the carbon quantum dots to crystallization with the manner of calcination in an inert atmosphere so as to obtain the carbon quantum dot and titanium codoped composite photocatalyst. Compared with the prior art, the method provided by the invention has the following advantages: simplicity, convenience, easy operation, and highly-efficient utilization of raw materials are realized; meanwhile, the carbon quantum dots and the titanium can be codoped into pore walls of a mesoporous material, and synergistic effects are generated in the pore walls, so improvement of photocatalytic activity is promoted; meanwhile, ordered mesoporous channels also provide good channels for diffusion and transmission of guest molecules, so the prepared photocatalyst has good catalytic degradation activity to organic pollutants like acid orange 7 (AO7) and 2,4-dichlorophenol (2,4-DCP).

Description

technical field [0001] The invention relates to a photocatalytic material which can be used for degrading pollutants in water, and belongs to the technical field of photocatalysis. Background technique [0002] Mesoporous silica is a new type of nano-material developed in recent years, it has up to 1000m 2 / g specific surface area, continuously adjustable pore size and highly long-range ordered channels, high thermal stability, etc. These excellent structural properties make them have great application value in catalysis, drug loading, exhaust gas adsorption, separation and purification, and solar photoelectric conversion. Once reported, they have attracted extensive attention in various related fields. Especially in recent years, with the continuous innovation of synthesis technology, various structures such as KIT, MSU and SBA mesoporous silica have been reported continuously, and the research on mesoporous materials has shown a booming scene. The research on the mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18C02F1/30
Inventor 张金龙王灵芝刘勇弟雷菊英程晨杨林钢严雪枫甘凯峰李红
Owner EAST CHINA UNIV OF SCI & TECH
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