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High-activity g-C3N4 photocatalytic material as well as preparation method and application thereof

A photocatalytic material, g-c3n4 technology, applied in the field of photocatalysis, can solve the problems of fast charge recombination, small specific surface area, and low efficiency, and achieve the effects of easy migration, cheap and easy-to-obtain raw materials, and cost reduction

Pending Publication Date: 2021-06-25
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, g-C is obtained by heating the nitrogen-rich precursor 3 N 4 Due to the small specific surface area, fast charge recombination, and low efficiency, its industrial application is limited

Method used

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  • High-activity g-C3N4 photocatalytic material as well as preparation method and application thereof
  • High-activity g-C3N4 photocatalytic material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The Fe-doped g-C of embodiment 1 formaldehyde treatment 3 N 4 photocatalytic material

[0023] The preparation method is as follows:

[0024] 1) Add 0.017gFe(NO 3 ) 3 9H 2 O was added to a beaker containing 40ml of deionized water, then 3g of melamine was added, stirred for 0.5h, ultrasonicated for 0.5h, and dried at 60°C for 10h;

[0025] 2) Grind the solid obtained in step 1), add 0.01mol melamine into a beaker of 100ml deionized water, stir while bathing in 80°C water, and when the solution is clear, add 40% formaldehyde solution dropwise (in molar ratio, formaldehyde: melamine =0.005:1), stirred in water bath for 2h;

[0026] 3) Put the mixed solution obtained in step 2) into an oven, and dry at 80°C for 20 hours;

[0027] 4) Grind the precursor obtained in step 3), and heat up to 550°C for 4 hours at a rate of 5°C / min in a nitrogen atmosphere to obtain formaldehyde-treated Fe-doped g-C 3 N 4 Photocatalytic material, sample marked as 0.18% Fe / g-C 3 N 4 . ...

Embodiment 2

[0035] Example 2 detection

[0036] figure 1 For the sample 0.18% Fe / g-C 3 N 4 , sample 0.1% Fe / g-C 3 N 4 and pure g-C 3 N 4 The XRD test pattern, by figure 1 Visible, sample 0.18% Fe / g-C 3 N 4 , sample 0.1% Fe / g-C 3 N 4 There are two diffraction peaks at 13.1° and 27.3°, and pure g-C 3 N 4 The diffraction peaks are consistent. but with pure g-C 3 N 4 In comparison, with the increase of Fe doping amount, the XRD diffraction peak intensity decreases and the crystallinity of the sample becomes smaller.

Embodiment 3

[0037] Example 3 application

[0038] (1) Effects of different catalysts on catalytic degradation of isopropanol under visible light

[0039] The test process is: use a 300W xenon lamp as the light source, adjust the photocurrent to the position of 20mA, adjust the light intensity center to irradiate the sample surface, fix the position, and place the 0.18% Fe / g-C prepared in Example 1 and Comparative Example 1-2 respectively 3 N 4 , 0.10% Fe / g-C3 N 4 and pure g-C 3 N 4 put in 4cm 2 In the glass tank, put the glass tanks loaded with photocatalyst into 325cm 3 In the reactor, inject 5ul of isopropanol liquid into the reactor at last, wait for 2h for the isopropanol to completely volatilize into gas, start timing after 20min of light, and take a sample every 20min for testing. Record the peak area that degrades isopropanol to generate acetone, and obtain the concentration change point line diagram that degrades isopropanol to generate acetone through calculation, as figu...

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Abstract

The invention discloses a formaldehyde treated Fe ion doped g-C3N4 photocatalytic material as well as a preparation method and an application thereof. The preparation method comprises the following steps: a certain mass of iron salt is dissolved in deionized water, melamine is added into the solution, stirring is carried out, and ultrasonic treatment is carried out until the powder is uniformly mixed; the obtained precipitate is placed in a drying oven to be dried, the dried precipitate is placed in deionized water, water bath stirring is conducted till the solution is clear, a formaldehyde solution with a certain molar ratio is dropwise added, after water bath stirring is conducted for a certain time, the precipitate is placed in the drying oven to be dried, a precursor is obtained, the precursor is subjected to high-temperature calcination in a nitrogen environment, and formaldehyde-treated Fe-g-C3N4 is obtained. According to the formaldehyde-treated Fe ion-doped g-C3N4 photocatalytic material prepared by the method, the defect that g-C3N4 is low in response to natural light under visible light is overcome, the electron hole pair recombination rate is reduced, the photodegradation rate is increased, the photocatalytic activity can be effectively improved, and the method is low in cost, simple and easy to operate. Under natural light, organic pollutants can be degraded through illumination.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a highly active g-C 3 N 4 Photocatalytic materials and their preparation methods and applications. Background technique [0002] With the development of human society, the combustion of fossil fuels has caused a series of serious environmental problems, and the acquisition and conversion of solar energy into usable energy has become a key issue for human society. In recent years, photocatalytic degradation of organic pollutants has attracted more and more attention due to its advantages of no pollution and mild reaction conditions. However, due to the influence of the bandwidth of the photocatalytic material itself, the larger the bandgap width, the smaller the photoresponse range and the lower the photocatalytic utilization rate. Photocatalytic technology is widely regarded as an effective method to solve environmental problems. Graphitized carbonitride (g-C 3 N 4 )...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01D53/86B01D53/72
CPCB01J27/24B01J37/082B01D53/8668B01D2257/70B01J35/39
Inventor 刘世兴张明怡王茜陶然范晓星
Owner LIAONING UNIVERSITY
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