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Preparation and application of titanium dioxide composite photocatalytic system

A composite photocatalysis and titanium dioxide technology, applied in the field of chemical industry, can solve problems such as difficult degradation, and achieve the effects of easy separation from liquid, short degradation time and abundant raw materials

Inactive Publication Date: 2018-02-09
云南健牛环境监测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on the catalytic degradation of nonylphenol because it is difficult to degrade

Method used

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  • Preparation and application of titanium dioxide composite photocatalytic system
  • Preparation and application of titanium dioxide composite photocatalytic system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Preparation of carbon quantum dot solution: Weigh 80g of milk and add it to 20mL of ultrapure water, sonicate for 5min, transfer to a polytetrafluoroethylene reactor, heat at 180°C for 16h, cool naturally, and filter with a pore size of 0.22μm Membrane filtration, and then dialysis treatment with a dialysis bag with a molecular weight cut-off of 3000Da for 24 hours to obtain water-soluble carbon quantum dots.

[0023] 2. Preparation of composite photocatalytic system gold nano-carbon quantum dots-titanium dioxide, including the following steps:

[0024] (1) Preparation of gold nanoparticles: Mix 20 mg of chloroauric acid and 20 mg of polyvinylpyrrolidone and dilute to 50 mL, heat and stir the mixed solution, and inject 0.03 mol / L sodium borohydride solution rapidly after the temperature rises to 100 °C 15mL, continue to stir for 30min, remove the heat source, and naturally cool to room temperature to prepare a gold nanometer solution.

[0025] (2) Preparation of gol...

Embodiment 2

[0030] 1. Preparation of carbon quantum dot solution: Weigh 80g of milk and add it to 20mL ultrapure water, sonicate for 5min, transfer to a polytetrafluoroethylene reactor, heat at 200°C for 12h, cool naturally, and use a pore size of 0.22μm Membrane filtration, and then dialysis treatment with a dialysis bag with a molecular weight cut-off of 3500Da for 24 hours to obtain water-soluble carbon quantum dots. .

[0031] 2. Preparation of composite photocatalytic system gold nano-carbon quantum dots-titanium dioxide, including the following steps:

[0032] (1) Preparation of gold nanoparticles: Mix 20 mg of chloroauric acid and 20 mg of polyvinylpyrrolidone and dilute to 50 mL, heat and stir the mixed solution, and inject 0.03 mol / L sodium borohydride solution rapidly after the temperature rises to 100 °C 20mL, continue to stir for 30min, remove the heat source, and naturally cool to room temperature to prepare the AuNPs solution.

[0033] (2) Preparation of gold nano-carbon q...

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Abstract

The invention discloses preparation and application of a titanium dioxide composite photocatalytic system. A preparation method comprises the steps of (1) nanometer gold preparation; (2) nanometer gold-carbon quantum dot preparation; (3) nanometer gold-carbon quantum dot-titanium dioxide composite system preparation. Visible light is used for performing photocatalytic performance test on the prepared composite material; the excellent photocatalytic performance of the material is proved by degrading organic pollutants of nonyl phenol. By starting from the angle of the composite material, the nanometer gold-carbon quantum dots are used as a titanium dioxide sensitizer; in visible light, after the photolytic activity sensitizer absorbs energy, free electrons are excited out; the electrons aretransferred onto a conduction band of titanium dioxide and then take a reduction reaction with organic matters; a good degradation effect is achieved. Nontoxic and harmless carbon quantum dots are used for modifying the titanium dioxide; a titanium dioxide visible light photocatalytic system is built; the absorption capacity and the catalytic activity of the system are improved; the degradation efficiency on pollutants is enhanced.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to the preparation and application of a titanium dioxide composite photocatalytic system. Background technique [0002] Wide bandgap semiconductor material TiO 2 It has been widely used in sensitized solar cells, photocatalytic hydrogen production, photocatalytic degradation of pollutants and other fields. Since it can only absorb 5% of the ultraviolet light in sunlight, in order to improve the TiO 2 Utilization of sunlight, usually in TiO 2 Dye or narrow-bandgap quantum dots are introduced into the photoanode as sensitizers. for improving TiO 2 In addition to fully absorbing sunlight to increase the number of photogenerated carriers, the photocatalytic sensitizer should also have the ability to effectively inject excited electrons into TiO 2 The conduction band matches the energy level and the surface functional groups maintain its stability. Carbon quan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52C02F1/30C02F101/34
CPCC02F1/30B01J23/52C02F2101/345B01J35/39
Inventor 焦扬华建豪杨亚玲
Owner 云南健牛环境监测有限公司
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