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Carbon dot-molybdenum trioxide and carbon nitride composite catalyst, preparation method and applications thereof

A technology of molybdenum trioxide and carbon nitride, which is applied in the field of photocatalysis, can solve the problems of high recombination rate of photogenerated electrons and holes, low light utilization rate, etc., achieve high application prospects and use value, good material stability, meet The effect of mass production requirements

Inactive Publication Date: 2018-03-16
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its low light utilization efficiency and high recombination rate of photogenerated electrons and holes, the g-C 3 N 4 Practical applications in the field of photocatalysis

Method used

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  • Carbon dot-molybdenum trioxide and carbon nitride composite catalyst, preparation method and applications thereof
  • Carbon dot-molybdenum trioxide and carbon nitride composite catalyst, preparation method and applications thereof
  • Carbon dot-molybdenum trioxide and carbon nitride composite catalyst, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A kind of preparation of carbon point and molybdenum trioxide composite carbon nitride photocatalyst, comprises the following steps:

[0034] (1) Weigh 3g of ammonium molybdate heptahydrate and place it in an alumina crucible, heat it at 80°C for 12h, then transfer it to a muffle furnace, raise the temperature to 450°C at a rate of 2.5°C / min and keep the temperature for reaction 5h; after cooling to room temperature, grind for 30min and sieve to obtain off-white MoO 3 powder;

[0035](2) Weigh 1g of urea and 3g of citric acid in a 50ml beaker, add 10ml of ultrapure water, ultrasonically dissolve it for 10min, then transfer it to a polytetrafluoroethylene high-temperature hydrothermal reactor, and react at 180°C for 5h; wait for it to cool to room temperature, a brown aqueous solution was obtained, and the solution was centrifuged to remove large particles, dried and ground to obtain a brown-black CDs powder;

[0036] (3) Weigh 3g of dicyandiamide and place it in an al...

Embodiment 2

[0047] A kind of preparation of carbon point and molybdenum trioxide composite carbon nitride photocatalyst, comprises the following steps:

[0048] (1) Weigh 5g of ammonium molybdate heptahydrate and place it in an alumina crucible, bake it at 90°C for 10h, then move it to a muffle furnace, raise the temperature to 550°C at a rate of 4°C / min and maintain the temperature React for 6 hours; after cooling to room temperature, grind for 30 minutes and sieve to obtain pale MoO 3 powder;

[0049] (2) Weigh 1.5g of urea and 3.3g of citric acid into a 50mL beaker, add 15mL of ultrapure water, ultrasonically dissolve for 10min, transfer to a polytetrafluoroethylene high-temperature hydrothermal reactor, and react at 160°C for 3.5h; After it was cooled to room temperature, a brown aqueous solution was obtained, and the solution was centrifuged to remove large particles, dried and ground to obtain a brown-black CDs powder;

[0050] (3) Weigh 5 g of dicyandiamide and place it in an alu...

Embodiment 3

[0053] An application of carbon dots of the present invention and molybdenum trioxide composite carbon nitride photocatalyst to degrade antibiotics, comprising the following steps:

[0054] (1) Weigh 30 mg of the photocatalyst MoO prepared in Implementation 1 3 -CDs / C 3 N 4 Place in a quartz photolysis tube, add a tetracycline solution with a concentration of 20mg / L and a volume of 50mL, ultrasonically disperse for 5 minutes, and then place it in a photolysis instrument for stirring and adsorption for 30 minutes.

[0055] (2) light source adopts 350W xenon lamp configuration 420nm optical filter to carry out photocatalytic reaction, and the reaction time is 90min, treats to react with liquid chromatography detection solution remaining tetracycline concentration (C t ). According to the formula P=(C 0 -C t )*100% to calculate the removal rate of tetracycline, where C 0 is the initial concentration of tetracycline. The result is as Figure 4 shown.

[0056] (3) take by ...

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Abstract

The invention belongs to the field of photocatalysis, and discloses a preparation method and applications of a carbon dot-molybdenum trioxide co-composite carbon nitride catalyst. The preparation method comprises the following operation steps: S1, preparing MoO3 powder; S2, preparing CDs powder; S3, preparing C3N4 powder; and S4, preparing a MoO3-CDs / C3N4 composite catalyst: weighing C3N4 powder,MoO3 powder and CDs powder, mixing, adding anhydrous ethanol, carrying out ultrasonic dispersion, increasing the temperature of the mixed solution to 75 DEG C, carrying out stirring evaporation, transferring into an oven, drying at a temperature of 100 DEG C, cooling, taking out the powder solid, uniformly grinding, transferring into a muffle furnace, carrying out a reaction, cooling to a room temperature, grinding, and screening to obtain the carbon dot-molybdenum trioxide and carbon nitride composite catalyst. According to the present invention, the preparation method has advantages of goodrepeatability, good controllability, good material stability, high application prospect and high use value, and can well meet the mass production requirements.

Description

technical field [0001] The invention belongs to the field of photocatalysis and relates to a composite photocatalyst and its preparation method and application, in particular to a carbon dot-molybdenum trioxide and carbon nitride composite photocatalyst and its preparation method and application. Background technique [0002] In recent years, due to the serious problem of energy shortage, semiconductor photocatalysis technology has increasingly attracted the attention of scientific researchers. Carbon nitride in graphite phase (g-C 3 N 4 ) is a new type of non-metallic semiconductor material with visible light responsiveness, with a medium bandgap width (2.7eV), and has the advantages of low production cost and simple preparation method. In addition, g-C 3 N 4 It also has the characteristics of high chemical and thermal stability and low toxicity. However, due to its low light utilization efficiency and high recombination rate of photogenerated electrons and holes, the ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J37/10C02F1/30C02F101/34C02F101/38
CPCC02F1/30B01J27/24B01J37/082B01J37/084B01J37/088B01J37/10C02F2101/34C02F2101/38C02F2305/10B01J35/23B01J35/39
Inventor 冯义平谢治杰刘国光吕文英王枫亮
Owner GUANGDONG UNIV OF TECH
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