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Modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material and preparation method and application thereof

A technology of composite materials and carbon nitride, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems that the photocatalytic performance needs to be greatly improved, achieve excellent photocatalytic bactericidal activity, reduce The effect of reaction energy consumption and good sterilization effect

Pending Publication Date: 2020-07-14
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now it has been widely used in photolysis of water to produce hydrogen, degradation of organic pollutants, etc. However, the current common pure g-C 3 N 4 Photogenerated electrons-holes are easy to recombine, and the photocatalytic performance still needs to be greatly improved

Method used

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  • Modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material and preparation method and application thereof
  • Modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material and preparation method and application thereof
  • Modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Ordinary carbon nitride (g-C 3 N 4 ) preparation method:

[0034] Grind 4g of melamine, raise the temperature to 520°C in a tube furnace fed with nitrogen for 100min, then calcinate at 520°C for 2h, raise the temperature to 540°C for 20min and keep it for 2h, and finally cool down to room temperature for 100min.

[0035] Modified carbon nitride (g-C 3 N 4 -m) preparation method:

[0036] Mix 1g of melamine and 3g of triaminopyrimidine in a mortar and grind them evenly, raise the temperature from 100°C to 520°C in a tube furnace fed with nitrogen, keep the temperature at 520°C for 2 hours, raise the temperature to 540°C for 20 minutes and keep it for 2 hours, and finally 100 minutes Bring to room temperature.

[0037] WO 3 The preparation method:

[0038] 4gH 2 WO 4 It was calcined in a muffle furnace at 520°C for 2h, and the heating time was 100min, then it was raised to 540°C for 2h in 20min, and then cooled to room temperature for 100min.

[0039] g-C 3 N 4 ...

Embodiment 2

[0045] Each g-C synthesized by calcining in embodiment 1 3 N 4 -m / WO 3 The practical application effect of visible light photocatalytic bactericidal active materials was tested. The concentration in E.Coil is 2×10 7 Add 50mg of the target photocatalytic fungicide to 50mL of CFU / mL physiological saline solution. 2 Irradiate under visible light for 2 hours to kill the bacteria and then take samples. Spread the diluted bacterial solution on the solid medium and put it in a constant temperature incubator for 24 hours. The temperature in the constant temperature incubator is kept at 37°C. Counted by plate counting method.

[0046] figure 1 After culturing for 24 hours, add g-C 3 N 4 -m / WO 3 (1:1) The growth of bacteria in the composite material group before and after light, it can be seen that g-C 3 N 4 -m / WO 3 (1:1) is a visible light catalyzed fungicide, which can kill Escherichia coli well after being exposed to light. figure 2 g-C prepared for Example 1 3 N 4 -m / ...

Embodiment 3

[0048] Modified Carbon Nitride and WO 3 Different ratios of different ratios can adjust the efficiency of sterilization, and different ratios affect the rate of electron separation. Adjusting the different ratios between the two and optimizing the performance of the composite material has an important impact on improving the sterilization efficiency. Very important effect, the present invention is by adjusting the ratio of the two, and adopts the sterilization method of embodiment 2 to test the bactericidal performance.

[0049] image 3 For different g-C in embodiment 1 3 N 4 -m, WO 3 g-C in mass proportion 3 N 4 -m / WO 3 The killing effect of photocatalytic fungicides on Escherichia coli can be seen that g-C 3 N 4 -m / WO 3 (1:1) has the best bactericidal effect.

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Abstract

The invention discloses a modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material and a preparation method and application thereof in preparation of a photocatalytic bactericide. The preparation method comprises the following steps: uniformly mixing melamine, triaminoimine and tungstic acid, and performing calcining at 500-550 DEG C in an inert atmosphere for1-6 hours to obtain the modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material. The invention also discloses a photocatalytic sterilization method of E.Coli-containing wastewater, which comprises the following steps: adding the modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material into the E.Coli-containing wastewater,carrying out dark reaction adsorption equilibrium, and carrying out visible light irradiation to carry out photocatalytic sterilization.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a p-n type heterojunction composite material coupled with modified carbon nitride and tungsten oxide, and a preparation method and application thereof. Background technique [0002] Photocatalytic antibacterial materials refer to semiconductors with photocatalytic properties. It is generally believed that semiconductor materials can generate active groups (·OH,·O 2 - and h + ), these active groups can interact with the cell wall and cell membrane of bacteria, causing the internal tissue of the cell to leak and destroy the integrity. At the same time, the macromolecules in the cells will also be destroyed, resulting in disordered cell growth and metabolism, and finally the bacteria are completely killed. [0003] Most of the photocatalytic antibacterial materials are semiconductors, and the performance of semiconductor materials is determined by their own special en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08C02F1/72C02F1/30C02F1/50
CPCB01J27/24B01J37/08B01J37/084B01J37/088C02F1/725C02F1/30C02F1/50C02F2303/04C02F2305/10B01J35/39
Inventor 王齐肖维陈希乐李硕贺琴刘颖琪
Owner ZHEJIANG GONGSHANG UNIVERSITY
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