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Preparation method of iron doped carbon quantum dot/titanium dioxide composite photocatalyst and formaldehyde degradation method

A technology of titanium dioxide and carbon quantum dots, applied in the chemical industry, can solve the problems of slow release and light utilization efficiency obstructing the photocatalytic effect, etc., and achieve the effects of easy separation, improved photocatalytic performance, and short degradation time.

Pending Publication Date: 2018-06-29
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

Although the formaldehyde structure is simple and easy to eliminate, its release is slow, so the catalyst used needs to have good stability, and the light utilization efficiency is also an important aspect that plagues the current photocatalytic effect

Method used

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  • Preparation method of iron doped carbon quantum dot/titanium dioxide composite photocatalyst and formaldehyde degradation method
  • Preparation method of iron doped carbon quantum dot/titanium dioxide composite photocatalyst and formaldehyde degradation method

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Embodiment 1

[0023] 1. Preparation of iron-doped carbon quantum dots: Weigh 10g of citric acid, 1g of ammonium ferrous sulfate dissolved in 50 mL of pure water, then add 5mL of ethylenediamine, ultrasonically mix for 10min, transfer to polytetrafluoroethylene The ethylene-lined reactor was heated at 200°C for 5 hours, and after natural cooling, it was centrifuged at 8000r / min for 15 minutes to remove large particles of impurities. After passing through a 0.22μm filter membrane, blue fluorescent iron-doped carbon quantum dots were obtained, and placed in a vacuum oven at 60°C Dry and set aside.

[0024] 2. Preparation of titanium dioxide: Weigh 2g of P25 titanium dioxide powder, disperse 0.2g of CTAB in 50mL of pure water, mechanically stir for 4 hours, place in a vacuum oven at 60°C for drying, and calcinate the dried powder at 400°C for 4 hours to eliminate titanium dioxide The negative charge aggregation effect on the surface results in calcined titanium dioxide.

[0025] 3. Preparation...

Embodiment 2

[0029] 1. Preparation of iron-doped carbon quantum dots: Weigh 15g of citric acid and 3g of ferrous ammonium sulfate in 100mL of pure water, then add 10mL of ethylenediamine, mix thoroughly by ultrasonication for 20min, and transfer to polytetrafluoroethylene The lined reactor was heated at 200°C for 7 hours, and after natural cooling, it was centrifuged at 8000r / min for 25 minutes to remove large particles of impurities. After passing through a 0.22μm filter membrane, blue fluorescent iron-doped carbon quantum dots were obtained, and dried in a vacuum oven at 60°C spare.

[0030] 2. Preparation of titanium dioxide: Weigh 4g of P25 titanium dioxide powder, 0.5g of CTAB dispersed in 50mL of pure water, mechanically stir for 6 hours, then place in a vacuum oven at 60°C for drying, and calcinate the dried powder at 400°C for 6 hours to eliminate titanium dioxide The negative charge aggregation effect on the surface results in calcined titanium dioxide.

[0031] 3. Preparation of...

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Abstract

The invention discloses a preparation method of an iron doped carbon quantum dot / titanium dioxide composite photocatalyst and a formaldehyde degradation method. The preparation method comprises following steps: (1) preparing iron doped carbon quantum dots; and (2) preparing the iron doped carbon quantum dot / titanium dioxide composite photocatalyst. The prepared iron doped carbon quantum dot / titanium dioxide composite photocatalyst can be used to catalytically degrade formaldehyde in the presence of visible light. An interface charge transfer effect is utilized to construct iron doped carbon quantum dots; iron doping can enhance the photocatalytic activity of the composite photocatalyst, because the work content of carbon quantum dots is reduced by the iron doping, a great potential barrieris formed between iron doped carbon quantum dots and titanium dioxide, and the photocatalytic performance of iron doped carbon quantum dots / titanium dioxide is enhanced. The introduction of iron doped carbon quantum dots greatly strengthens the catalytic performance of titanium dioxide in the presence of visible light. After 180 minutes of irradiation of visible light, the degradation rate of formaldehyde (3-30 mg / L) is increased to 85% or more, compared with 40% (titanium dioxide is taken as the catalyst).

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] Titanium dioxide has many unique advantages, including stable chemical properties, photoelectrochemical properties; photocorrosion resistance; non-toxic to organisms; abundant sources; it is an efficient photocatalyst, so it is often used for the degradation of organic pollutants and the purification of air , sterilizer and demister. However, because titanium dioxide has a wide band gap of 3.2ev, it can only absorb ultraviolet light with a short wavelength, so the utilization rate of solar energy is very low and only 3% to 5%; and due to the recombination of electron holes generated by photoexcitation, resulting in The low quantum efficiency of light restricts the application of semiconductor photocatalysts. [0003] Studies have found that ...

Claims

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Application Information

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IPC IPC(8): B01J23/745A62D3/17A62D101/28
CPCA62D3/17B01J21/063B01J23/745A62D2101/28B01J35/19B01J35/39
Inventor 焦扬母昭杨亚玲
Owner 云南健牛环境监测有限公司
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