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Carbon nitride compounded chromium sesquioxide oxygen-vacancy-containing photo-thermal catalyst as well as preparation method and application thereof

A technology of chromium trioxide and carbon nitride, which is used in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve problems such as low catalytic activity, achieve no environmental pollution, reduce costs, and inhibit current-carrying. The effect of subcompositing

Active Publication Date: 2019-08-23
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However due to Cr 2 o 3 As a p-type semiconductor, electrons or holes are easy to recombine, and the catalytic activity is low
Carbon nitride is an n-type semiconductor, so Cr 2 o 3 Forming a heterojunction with the carbon nitride composite interface can overcome the recombination of electrons or holes. In addition, the introduction of N-Cr bonds can also improve the catalytic activity. However, the carbon nitride composite chromium trioxide contains oxygen defects as Photothermal catalysts have not yet been reported

Method used

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  • Carbon nitride compounded chromium sesquioxide oxygen-vacancy-containing photo-thermal catalyst as well as preparation method and application thereof
  • Carbon nitride compounded chromium sesquioxide oxygen-vacancy-containing photo-thermal catalyst as well as preparation method and application thereof
  • Carbon nitride compounded chromium sesquioxide oxygen-vacancy-containing photo-thermal catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Photothermal Catalysts Containing Oxygen Defects in Chromium Trioxide Composite with Carbon Nitride

[0022] (1) The preparation method is as follows

[0023] Dissolve 2.52g of melamine and 4g of chromium nitrate nonahydrate in 80ml of deionized water, stir for 1 hour, and dry at 60°C to obtain a precursor.

[0024] The precursor was ground and calcined at 500°C for 2h in the air environment with a heating rate of 5°C / min to obtain a carbon nitride composite chromium trioxide photothermal catalyst containing oxygen defects, marked as 500-CN.

[0025] (2) Detection

[0026] figure 1 500-CN prepared for Example 1 and pure Cr 2 o 3 The XRD test pattern, by figure 1 It can be seen that the sample 500-CN has diffraction peaks at 24.6°C, 33.7°C, 36.3°C, 40.0°C and 41.5°C, which are different from pure Cr 2 o 3 The characteristic peaks are similar, which proves that 500-CN has been successfully synthesized, and the sample 500-CN does not have two diffraction peaks at 13...

Embodiment 2

[0028] Photothermal Catalysts Containing Oxygen Defects in Chromium Trioxide Composite with Carbon Nitride

[0029] (1) The preparation method is as follows

[0030] Dissolve 2.52g of melamine and 4g of chromium nitrate nonahydrate in 80ml of deionized water, stir for 1 hour, and dry at 60°C to obtain a precursor.

[0031] The precursor was ground and calcined at 600°C for 2 hours in an air environment with a heating rate of 5°C / min to obtain a carbon nitride composite chromium trioxide photothermal catalyst containing oxygen defects, marked as 600-CN.

[0032] (2) Detection

[0033] figure 2 600-CN prepared for Example 2 and pure Cr 2 o 3 The XRD test pattern, by figure 2 It can be seen that the sample 600-CN has diffraction peaks at 24.6°C, 33.7°C, 36.3°C, 40.0°C and 41.5°C, which is similar to that of pure Cr 2 o 3 The characteristic peaks are similar, which proves that 600-CN has been successfully synthesized, and the sample 600-CN does not have two diffraction pe...

Embodiment 3

[0035] Photothermal Catalysts Containing Oxygen Defects in Chromium Trioxide Composite with Carbon Nitride

[0036] (1) The preparation method is as follows

[0037] Dissolve 2.52g of melamine and 4g of chromium nitrate nonahydrate in 80ml of deionized water, stir for 1 hour, and dry at 60°C to obtain a precursor.

[0038] The precursor was ground and calcined at 800°C for 2h in the air environment with a heating rate of 5°C / min to obtain a carbon nitride composite chromium trioxide photothermal catalyst containing oxygen defects, marked as 800-CN.

[0039] (2) Detection

[0040] image 3 500-CN prepared for Example 3 and pure Cr 2 o 3 The XRD test pattern, by image 3 It can be seen that the sample 800-CN has diffraction peaks at 24.6°C, 33.7°C, 36.3°C, 40.0°C and 41.5°C, which are different from pure Cr 2 o 3 The characteristic peaks are similar, which proves that 800-CN has been successfully synthesized, and the sample 800-CN does not have two diffraction peaks at 13...

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Abstract

The invention discloses a carbon nitride compounded chromium sesquioxide oxygen-vacancy-containing photo-thermal catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: putting a nitrogen-containing organic matter and a chromium salt input deionized water, stirring and keeping for 0.5-5 hours, and drying so as to obtain a precursor; grinding the precursor, carrying out calcining in an inert gas environment or an air environment, and carrying out natural cooling so as to obtain the carbon nitride compounded chromium sesquioxide oxygen-vacancy-containing photo-thermal catalyst of which the carbon nitride content is 1-5%, wherein the calcining temperature is 200-800 DEG C, and the calcining time is 1-10 hours. By adopting a carbon nitride compounded chromium sesquioxide oxygen-vacancy-containing material prepared by using the method disclosed by the invention, electrons or holes caused by thermal activation can be captured byvirtue of oxygen defects, and carrier recombination can be effectively inhibited, so that photo-thermal catalytic activity can be improved. By adopting the obtained photo-thermal catalyst, organic pollutants can be effectively degraded.

Description

technical field [0001] The invention belongs to the technical field of photothermal catalytic materials, and in particular relates to a carbon nitride-composited chromium trioxide photothermal catalyst containing oxygen defects and a preparation method and application thereof. Background technique [0002] In recent years, the problem of environmental pollution has become one of the main issues of global concern. Among the many environmental purification methods, various environmental catalytic technologies such as photocatalysis and electrocatalysis have attracted much attention. Photothermal catalysis technology is an environmentally friendly technology, which can directly use heat source to degrade organic pollutants, and has the advantages of less pollution and recyclable use. [0003] Cr 2 o 3 With high chemical and thermal stability, it is mainly used in industrial refractory materials, high-temperature anti-oxidation substances and high-performance gas sensors. Mae...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/72
CPCB01J27/24B01D53/8668B01J35/39
Inventor 范晓星蔡鹤李林丽
Owner LIAONING UNIVERSITY
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