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Oxygen-doped carbon nitride/zinc oxide photo-catalyst as well as preparation method and application thereof

A photocatalyst, carbon nitride technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of high recombination rate of photogenerated electrons and holes, low quantum conversion efficiency, disadvantageous wide application and other problems, to achieve the effect of improving the photocatalytic activity, reducing the recombination rate and low recombination efficiency.

Active Publication Date: 2014-10-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although titanium dioxide has the advantages of non-toxicity, high efficiency and low cost, its wide forbidden band width causes it to only absorb about 4% of the ultraviolet light in sunlight, which greatly limits its application.
[0003] Graphite-like carbon nitride has been widely studied due to its catalytic activity under visible light. conducive to its wide application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Oxygen-doped carbon nitride / zinc oxide photocatalysts were prepared as follows:

[0026] (1) Using melamine as the precursor, first place the precursor in a calcination environment, raise the temperature to 600°C at a heating rate of 5°C / min and keep the temperature for calcination for 2 hours, then grind the obtained yellow solid into fine powder, and then The fine powder is placed in a calcination environment, and the temperature is raised to 500°C at a heating rate of 10°C / min, and the temperature is maintained for 2 hours to be calcined to obtain carbon nitride nanosheets;

[0027] (2) Add 1 mass unit of zinc oxide precursor (zinc acetate) in 10 volume units of dehydrated alcohol, then add 0.01 volume unit of diethylenetriamine, ultrasonically disperse, and then transfer the resulting solution to In a hydrothermal reaction kettle, react at 110°C for 20 hours, wash with absolute ethanol and deionized water, filter and dry to obtain zinc oxide nanomaterials;

[0028]...

Embodiment 2

[0032] Oxygen-doped carbon nitride / zinc oxide photocatalysts were prepared as follows:

[0033] (1) Using dicyandiamide as a precursor, first place the precursor in a calcination environment, raise the temperature to 400°C at a heating rate of 0.1°C / min and keep the temperature for calcination for 8 hours, then grind the obtained yellow solid into fine powder, Then place the fine powder in a calcination environment, raise the temperature to 400°C at a heating rate of 1°C / min and keep the temperature for calcination for 6 hours to prepare carbon nitride nanosheets;

[0034] (2) Add the zinc oxide precursor (zinc nitrate) of 8 mass units in the dehydrated alcohol of 80 volume units, then add the diethylenetriamine of 4 volume units, ultrasonic dispersion, then, the solution obtained is transferred to In a hydrothermal reaction kettle, react at 180°C for 6 hours, wash with absolute ethanol and deionized water, filter and dry to obtain zinc oxide nanomaterials;

[0035] (3) The z...

Embodiment 3

[0038] Oxygen-doped carbon nitride / zinc oxide photocatalysts were prepared as follows:

[0039] (1) Using dicyandiamide as the precursor, first place the precursor in a calcination environment, raise the temperature to 500°C at a heating rate of 0.5°C / min and keep the temperature for calcination for 3 hours, then grind the obtained yellow solid into fine powder, Then place the fine powder in a calcination environment, raise the temperature to 450°C at a heating rate of 5°C / min and keep the temperature for calcination for 4 hours to prepare carbon nitride nanosheets;

[0040] (2) Add 3 mass units of zinc oxide precursor (zinc chloride) to 45 volume units of absolute ethanol, then add 1.0 volume units of diethylenetriamine, ultrasonically disperse, and then transfer the obtained solution Put it in a hydrothermal reaction kettle, react at 130°C for 10 hours, wash with absolute ethanol and deionized water, filter and dry to obtain zinc oxide nanomaterials;

[0041] (3) The zinc o...

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Abstract

The invention discloses an oxygen-doped carbon nitride / zinc oxide photo-catalyst as well as a preparation method and application of the oxygen-doped carbon nitride / zinc oxide photo-catalyst. The preparation method comprises the following steps: taking dicyandiamide or melamine as a precursor, calcining to prepare a carbon nitride nanosheet; adding a zinc oxide precursor into absolute ethyl alcohol, then adding dethylenetriamine, carrying out ultrasonic dispersion and subsequently enabling dispersion liquid to be subjected to hydrothermal reaction, so as to obtain zinc oxide nano material; enabling the zinc oxide nano material and the carbon nitride nanosheet to be subjected to ultrasonic dispersion in deionized water, subsequently adding hydrogen peroxide, then carrying out hydrothermal reaction again, and thus obtaining the oxygen-doped carbon nitride / zinc oxide photo-catalyst after the reaction is ended. The oxygen-doped carbon nitride / zinc oxide photo-catalyst adopts low-cost and easily available raw materials; the preparation condition can be easily achieved; the raw materials do not need to be calcined under the condition of high temperature, so that the cost for preparing the oxygen-doped carbon nitride / zinc oxide photo-catalyst is reduced, and the popularization and application of the preparation method are facilitated; meanwhile, the photo-catalyst is low in photo-production electron-cavity compounding efficiency and high in photo-catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to an oxygen-doped carbon nitride / zinc oxide photocatalyst and a preparation method and application thereof. Background technique [0002] In recent years, due to the increasingly prominent problems of energy crisis and environmental pollution, the use of photocatalysts to degrade pollutants in the environment has attracted widespread attention as an environmentally friendly and low-cost technology. At present, the commonly used photocatalyst is titanium dioxide. Although titanium dioxide has the advantages of non-toxicity, high efficiency and low cost, it can only absorb about 4% of ultraviolet light in sunlight due to its wide forbidden band width, which greatly limits its application. Therefore, it is very important to develop a photocatalyst or its composite material that can be catalyzed under visible light with low price and stable performance. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/32C01B3/04C02F101/30
CPCY02A20/212Y02E60/36
Inventor 黄洪陈炎丰司徒粤
Owner SOUTH CHINA UNIV OF TECH
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