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C3N4 preparation method

A C3N4, calcination technology, applied in the direction of nitrogen and non-metallic compounds, can solve the problems of unfavorable environmental protection and large-scale preparation, and achieve the effect of high yield, simple steps and controllable process

Inactive Publication Date: 2012-06-20
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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preparation example Construction

[0023] The present invention provides a C 3 N 4 preparation methods, including:

[0024] Thiourea is calcined at 300-650 to obtain the product; the product includes C 3 N 4 .

[0025] Thiourea is a compound formed after the oxygen in urea is replaced by sulfur, which belongs to thioamide (RC(S)NR 2 , R is a hydrocarbon group). Due to the difference in electronegativity, despite similar structures, thiourea and urea have very different properties. Thiourea is widely used in organic synthesis. Molecular formula is shown in formula I. Because its tautomerism will intensify when heated, and with the occurrence of polycondensation, a multimer with an uncertain structure is obtained, which is not stable and will be further decomposed into C 3 N 4 .

[0026]

[0027] Formula I

[0028] According to the present invention, the calcination can be carried out under aerobic or anaerobic conditions, wherein, the calcination temperature is the C 3 N 4 The key, the temperatur...

Embodiment 1

[0035]Weigh 10.0g of urea and place it in a crucible, cover it, and calcinate it under aerobic conditions. The calcining temperature is 550°C, and the calcining time is 2h. Cool to obtain C 3 N 4 catalyst.

[0036] Such as figure 1 Shown, the C prepared for the implementation of the present invention 3 N 4 The XRD picture, shows that the prepared C 3 N 4 With graphite phase crystal.

[0037] Such as figure 2 Shown, the C prepared for the implementation of the present invention 3 N 4 The UV-Vis absorption spectrum of the prepared C 3 N 4 Can absorb visible light, the maximum absorption wavelength is 650nm.

[0038] Such as image 3 Shown, the C prepared for the implementation of the present invention 3 N 4 The SEM pattern of the prepared C 3 N 4 Has a layered structure.

Embodiment 2

[0040] Weigh 10.0g of urea and put it in a crucible, calcining under aerobic conditions, the calcining temperature is 500°C, the calcining time is 4h, and cooling to obtain C 3 N 4 catalyst.

[0041] Such as Figure 4 Shown, for the C prepared in this example 3 N 4 The UV-Vis absorption spectrum of the prepared C 3 N 4 Can absorb visible light, the maximum absorption wavelength is 700nm.

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Abstract

The invention provides a C3N4 preparation method. Thiourea is calcined at the temperature ranging from 300 DEG C to 650 DEG C to obtain a product, and the product contains C3N4. The thiourea is used as a precursor, molecules of the thiourea are condensed and polymerized by means of heating to form polymers, but the polymers are not stable and further can be decomposed into the C3N4. The method is convenient and speedy, poisonous and harmful precursors are omitted in a preparation procedure, yield is high, all the thiourea can participate in reaction and is reacted completely as shown in reaction detection, and no other pollutants, except for small amounts of sulfur dioxide, hydrogen sulfide and ammonia, are released, while the sulfur dioxide, the hydrogen sulfide and the ammonia can be absorbed by the aid of water and cannot pollute environments. In addition, the procedure of the preparation method is controllable, steps of the method are simple, only heating is required, complicated operation is omitted, and the preparation method is applicable to large-scale industrial production.

Description

technical field [0001] The invention relates to the field of preparation of organic compounds, in particular to a C 3 N 4 method of preparation. Background technique [0002] Photocatalysts are a class of compounds that can play a catalytic role under the action of light. It can mineralize organic matter under mild conditions without secondary pollution, and is an effective technology for controlling water and atmospheric organic pollutants. With the rapid development of my country's industry, the environmental pollution caused by various organic pollutants discharged into water bodies and the atmosphere has become increasingly prominent. The development of effective environmental pollution control technology is the main way to solve environmental pollution problems. The use of photocatalysts to mineralize environmental pollutants is an effective means to solve environmental pollution. [0003] Bandgap width is an important performance index for measuring photocatalysts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/082
Inventor 董帆孙艳娟刘海涛边际傅敏
Owner CHONGQING TECH & BUSINESS UNIV
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