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G-c3n4/kaolinite composite photocatalyst and preparation method thereof

A technology of photocatalyst and kaolinite, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of separation of unfavorable interfaces combined with photogenerated carriers, unsatisfactory photocatalytic performance under visible light, Complex process and other issues, to achieve the effect of inhibiting the recombination of photogenerated carriers, good reusability, and inhibiting self-agglomeration

Inactive Publication Date: 2016-11-16
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is complex and requires the synthesis of g-C by thermal polymerization 3 N 4 , and then long-term grinding and compounding
In addition, due to the mechanical grinding process, resulting in kaolin and g-C 3 N 4 The destruction of the original layered (2D) structure is not conducive to the combination of the two interfaces and the separation of photogenerated carriers, resulting in unsatisfactory photocatalytic performance under visible light.

Method used

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  • G-c3n4/kaolinite composite photocatalyst and preparation method thereof
  • G-c3n4/kaolinite composite photocatalyst and preparation method thereof
  • G-c3n4/kaolinite composite photocatalyst and preparation method thereof

Examples

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Embodiment 1

[0016] The specific implementation steps are as follows:

[0017] (1) Take 4g of dicyandiamide in 50mL of distilled water, stir and disperse at 60°C for 30 minutes until the dicyandiamide is completely dissolved, then slowly add 2g of kaolinite, continue stirring for 12h, then dry in an oven at 60°C, and grind 97% pass through 200 mesh sieve to get g-C 3 N 4 / Kaolinite precursor.

[0018] (2) the g-C described in step (1) 3 N 4 / The kaolinite precursor was calcined twice: the first closed calcining temperature was 550°C, the calcining time was 4h, and the heating rate was 2.3°C / min, and the second open calcining temperature was 500°C, the calcining time was 2h, and the heating rate was 5°C / min. Finally, the g-C of the visible light response is obtained 3 N 4 / kaolinite composite photocatalytic material.

[0019] According to the above process conditions, pure g-C was prepared simultaneously 3 N 4 as a control sample.

[0020] The g-C that embodiment 1 prepares 3 N...

Embodiment 2

[0022] The steps are the same as those in Example 1, except that the amount of distilled water in step (1) is 75ml, the dipping temperature is 50°C, the amount of dicyandiamide is 3g, the reaction time of stirring and dipping is 24h, and the drying temperature is 70°C; in step (2), g-C 3 N 4 / The kaolinite precursor was calcined at a temperature of 550°C with a cover for one time, the calcining time was 2 hours, and the heating rate was 5°C / min, and the second open calcining temperature was 550°C, the calcining time was 3 hours, and the heating rate was 10°C / min.

Embodiment 3

[0024] The steps are the same as those in Example 1, except that the amount of distilled water in step (1) is 100ml, the dipping temperature is 70°C, the amount of dicyandiamide is 5g, the reaction time of stirring and dipping is 18h, and the drying temperature is 50°C; in step (2), g-C 3 N 4 / The kaolinite precursor was calcined at a temperature of 600°C for one cover, for a calcination time of 3 hours, and a heating rate of 7.5°C / min, and for the second open calcination temperature of 450°C, for a calcination time of 1 hour, and a heating rate of 7.5°C / min.

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Abstract

The invention relates to a g-C3N4 / kaolinite photocatalyst and a preparation method thereof and belongs to the fields of nonmetallic mineral material deep-processing and environmental engineering. On the basis of a stratified structure and adsorption characteristics of kaolinite and chemical impregnation and calcination control technologies, piece-to-piece assembly of g-C3N4 and kaolinite is realized, and a kaolinite based composite photocatalytic material with high activity is prepared. With the adoption of the method, compositing of kaolinite and g-C3N4 is realized, g-C3N4 agglomeration and photon-generated carrier recombination are effectively inhibited, and pollutant adsorption and capture performance of the material and dispersibility of the catalyst are improved through a carrier effect of the kaolinite. The composite photocatalytic material has excellent photocatalytic activity under visible light, has low production cost, and is environment-friendly in a use process, thereby having great potential application value in the field of advanced treatment of organic wastewater.

Description

technical field [0001] The invention relates to a kaolinite composite g-C 3 N 4 A photocatalyst and a preparation method thereof belong to the fields of deep processing of non-metallic mineral materials and environmental engineering. Background technique [0002] Nowadays, with the development of human civilization, environmental pollution has increasingly become a major problem that human beings need to solve urgently. Photocatalytic technology can use solar energy to degrade and mineralize various pollutants in water and air, and is an ideal environmental pollution control technology. Graphite-like carbon nitride (g-C 3 N 4 ) is a metal-free, narrow-bandgap (2.7eV) non-metallic semiconductor material with a layered structure similar to graphite. It has strong thermal and chemical stability, and has a good response to visible light. Therefore, in recent years Widespread concern. Currently, g-C 3 N 4 The synthesis methods mainly include high temperature and high pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/39
Inventor 孙志明李春全姚光远
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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