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Preparation method of visible light catalyst

A catalyst, visible light technology, applied in the field of chemistry, can solve problems such as unfavorable environmental protection

Inactive Publication Date: 2011-11-23
CHONGQING TECH & BUSINESS UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A C 3 N 4 A preparation method, which uses highly toxic cyanamide or dicyanamide as a precursor to prepare C 3 N 4 , not conducive to environmental protection

Method used

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  • Preparation method of visible light catalyst
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  • Preparation method of visible light catalyst

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preparation example Construction

[0031] The invention discloses a preparation method of a visible light catalyst, comprising the following steps:

[0032] Calcining urea at 300-700°C to obtain C 3 N 4 .

[0033] The calcination described in the present invention can be carried out under aerobic or anaerobic conditions, wherein, the calcination temperature is the preparation C of the present invention. 3 N 4 The key, the temperature is too high or too low can not get C 3 N 4 , the calcination temperature is preferably 400-600°C, more preferably 500-600°C, most preferably 550°C. At the same time, the calcination time is also in the preparation of C 3 N 4 An important condition in the process, the calcination time is preferably 0.1-10 h, more preferably 1-5 h, most preferably 2 h.

[0034] C prepared by the present invention 3 N 4 It has a layered structure and a forbidden band width of 2.7eV, which can greatly absorb visible light. Its absorption wavelength is red-shifted to 600nm, and it has visible ...

Embodiment 1

[0050] Weigh 10.0g of urea and place it in a crucible, calcining under aerobic conditions, the calcining temperature is 550°C, the calcining time is 2h, and cooling to obtain C 3 N 4 catalyst.

[0051] Such as figure 1 Shown, the C prepared for the implementation of the present invention 3 N 4 The SEM picture.

Embodiment 2

[0053] Weigh 10.0g of urea and put it in a crucible, calcining under anaerobic conditions, the calcining temperature is 450°C, the calcining time is 4h, and cooling to obtain C 3 N 4 catalyst.

[0054] Such as figure 2 Shown, for the C prepared in this example 3 N 4 The XRD pattern.

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Abstract

The invention discloses a preparation method of a visible light catalyst. Compared with the prior art, the invention adopts inexpensive, non-toxic and harmless urea as the raw material, with no need for highly toxic raw materials. By controlling the calcination temperature, C3N4 can be prepared, thus being in favor of environment protection. The invention also provides a preparation method of a visible light catalyst, comprising the steps of: preparing C3N4 according to the above process; mixing the obtained C3N4 with a modifier in a solvent for reaction, drying the reaction product, thus obtaining the visible light catalyst. The modifier can be an Fe source compound, a Cu source compound, a Zn source compound, a V source compound, a W source compound, a Pt source compound, an Au source compound or a Pd source compound. The method of the invention employs an immersion method for C3N4 metal ion modification, so that metal ions can adsorb the C3N4 surface, thus inhibiting photoinduced charge recombination. Therefore, the visible light catalyst prepared by the preparation method provided in the invention has a high photo catalytic performance.

Description

technical field [0001] The invention relates to the technical field of chemistry, and more specifically, relates to a preparation method of a visible light catalyst. Background technique [0002] With the development of my country's economy, the use of various chemical additives in building materials and interior decoration coatings is also increasing, indoor air pollution is becoming more and more serious, and the concentration of organic matter in indoor air is greatly increased. At the same time, due to the sealing of modern buildings The performance is good, causing the problem of indoor air pollution to become increasingly prominent. At present, the pollution of volatile organic compounds (VOCs for short) such as formaldehyde and benzene series (benzene, toluene, xylene) is the main pollution factor of indoor air, and has become the main research object to solve indoor air pollution. [0003] The traditional indoor VOCs purification technology adopts the method of activ...

Claims

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Application Information

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IPC IPC(8): B01J27/24A62D3/10
Inventor 董帆傅敏孙艳娟武丽文
Owner CHONGQING TECH & BUSINESS UNIV
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