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Molybdenum carbide modified tubular carbon nitride photocatalytic material and its preparation method and application

A catalytic material, molybdenum carbide technology, applied in the field of materials, can solve the problems of insignificant photocatalytic performance, limited large-scale application, low utilization rate of visible light, etc., achieve superior photocatalytic activity, achieve effective separation, easy transfer and separation. Effect

Active Publication Date: 2020-12-25
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, monomeric carbon nitride also has disadvantages that cannot be ignored, such as its small specific surface area, high electron-hole recombination rate, low quantum efficiency, and low utilization rate of visible light, which lead to its insignificant photocatalytic performance.
Therefore, the large-scale application of graphitic carbon nitride semiconductors in the fields of energy and environmental photocatalysis research has been severely limited.

Method used

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  • Molybdenum carbide modified tubular carbon nitride photocatalytic material and its preparation method and application
  • Molybdenum carbide modified tubular carbon nitride photocatalytic material and its preparation method and application
  • Molybdenum carbide modified tubular carbon nitride photocatalytic material and its preparation method and application

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Embodiment 1

[0054] A kind of tubular carbon nitride (Mo) modified by molybdenum carbide of the present invention 2 C / TCN) photocatalytic material, its preparation method comprises the following steps:

[0055] (1) Preparation of tubular carbon nitride:

[0056] 1.1. Grind 8.56g of urea and 6g of melamine, dissolve in 70ml of deionized water, and stir at a constant speed for 2 hours to obtain a uniform mixed solution.

[0057] 1.2. Transfer the above mixed solution to a 100mL autoclave, and keep it warm at 180°C for 24 hours. After natural cooling, rinse with water and ethanol three times respectively, filter, and dry at 100°C for 12h to obtain the carbon nitride precursor .

[0058] 1.3. Put the carbon nitride precursor into a crucible, place it in a muffle furnace, heat it up to 550°C at a heating rate of 2.3°C / min, and keep it at 550°C for 4 hours. The whole process is carried out under the protection of nitrogen. After natural cooling, it was taken out and ground with a mortar to ob...

experiment example 1

[0066] Experimental Example 1: The monomeric carbon nitride in Comparative Example 1 and the tubular carbon nitride in Example 1 were scanned by an electron microscope.

[0067] figure 1 It is a scanning electron microscope (SEM) illustration of the monomer carbon nitride of Comparative Example 1 of the present invention and the tubular carbon nitride of Example 1, wherein (a) is monomer carbon nitride, and (b) is tubular carbon nitride .

[0068] figure 2 It is a transmission electron microscope (TEM) illustration of the monomeric carbon nitride of Comparative Example 1 of the present invention and the tubular carbon nitride of Example 1, wherein (a) is a monomeric carbon nitride, and (b) is a hollow tubular carbon nitride carbon.

[0069] From figure 1 and figure 2 It can be seen that the monomeric carbon nitride presents a block-like aggregated structure with a small specific surface area and no nanopores on the surface. However, the tubular carbon nitride presents ...

experiment example 2

[0070] Experimental example 2: the monomer carbon nitride of comparative example 1, the tubular carbon nitride in embodiment 1, molybdenum carbide and Mo 2 X-ray scanning of C / TCN composites.

[0071] image 3 It is the X-ray diffraction (XRD) comparative pattern of the monomeric carbon nitride of Comparative Example 1 of the present invention and the tubular carbon nitride of Example 1. From the figure, it can be found that there are two obvious XRD diffraction peaks at 13.1° and 27.2° that belong to the graphitic carbon nitride (100) and (002) crystal planes, confirming that the prepared product is g-C 3 N 4 . Compared with monomeric carbon nitride, the 27.2° peak of tubular carbon nitride becomes wider and its intensity becomes weaker, indicating that its crystal form becomes weaker, its thickness becomes thinner, and a hollow tubular structure is successfully formed.

[0072] Figure 4 Tubular carbon nitride, molybdenum carbide and Mo of embodiment 1 2 C / TCN composit...

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Abstract

The invention discloses a molybdenum carbide modified tubular carbon nitride photocatalytic material and a preparation method and application thereof. The molybdenum carbide modified tubular carbon nitride photocatalytic material comprises molybdenum carbide and tubular carbon nitride, wherein the surface of the tubular carbon nitride is modified with the molybdenum carbide. The preparation methodcomprises the steps: suspending the tubular carbon nitride in methanol, so as to obtain a suspension; dispersing the molybdenum carbide in the suspension, carrying out intensive mixing, and carryingout drying, thereby obtaining the molybdenum carbide modified tubular carbon nitride photocatalytic material. According to the molybdenum carbide modified tubular carbon nitride photocatalytic material disclosed by the invention, an energy band structure of the carbon nitride is improved to form molybdenum carbide / carbon nitride heterojunction, so that the effective separation of photoproduction electron-hole pairs is achieved, the utilization efficiency of photoproduction electron-holes is increased, and the effect of photocatalytic degradation is promoted; the molybdenum carbide modified tubular carbon nitride photocatalytic material can be applied to degradation of antibiotics or dyes in wastewater.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a molybdenum carbide-modified tubular carbon nitride photocatalytic material 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 extensive attention as an environmentally friendly and low-cost technology. Semiconductor photocatalysis technology shows unique advantages in the field of environmental purification applications, especially in the photodegradation of organic pollution, reflecting the advantages of environmental friendliness, high efficiency, energy saving, and cleanliness. However, the low photocatalytic efficiency of traditional semiconductor photocatalysts and the low separation efficiency of photogenerated carriers restrict their development in the fiel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/10B01J37/08B01J37/03C02F1/30C02F101/30C02F101/34C02F101/38
Inventor 张辰周银曾光明汪文军杨洋黄丹莲周成赟罗晗倬贺东辉李旭波田苏红伏姗姗
Owner HUNAN UNIV
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