Preparation method of C3N4/SiO2 heterojunction photocatalyst

A C3N4, photocatalyst technology, applied in the field of photocatalytic material research, can solve the problems of high modification cost, complex process, difficult application of carbon nitride, etc., to achieve the effect of simple method, cheap raw materials, and improved utilization rate

Inactive Publication Date: 2017-02-15
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high cost of modification and complicated process, carbon nitride is still difficult to apply

Method used

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  • Preparation method of C3N4/SiO2 heterojunction photocatalyst
  • Preparation method of C3N4/SiO2 heterojunction photocatalyst
  • Preparation method of C3N4/SiO2 heterojunction photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Preparation and naming of samples.

[0020] Weigh 2 g of melamine, add silicon dioxide nanoparticles in different proportions therein, and ultrasonically obtain a suspension for 4 hours; stir the resulting suspension at 90 degrees Celsius for 12 hours to completely volatilize the water to obtain a white solid; the obtained solid Heating to 540 degrees Celsius at a heating rate of 4 degrees per minute, and keeping at this temperature for 4 hours; after natural cooling, the C3N4 / SiO2 heterojunction photocatalyst can be obtained. The mass ratios of silica and melamine are 1:100, 3:100, 5:100, 10:100, 30:100, respectively, and the obtained samples are named: g-C 3 N 4 / SiO 2 -1,g-C 3 N 4 / SiO 2 -3,g-C 3 N 4 / SiO 2 -5,g-C 3 N 4 / SiO 2 -10 and g-C 3 N 4 / SiO 2 -30.

[0021] Embodiment 1: the crystal structure of sample

[0022] In the following examples, the crystal structure of the prepared samples was tested using a Rigaku D / max-2400 X-ray diff...

Embodiment 2

[0024] Embodiment 2: Optical property characterization of samples

[0025] A Hitachi U-3900 UV-Vis spectrophotometer was used to measure BaSO 4 As a reference, the scanning wavelength range is: 200-800nm, the slit width is 2nm, and the scanning speed is 600nm / min to detect the change of the optical properties of the sample.

[0026] Changes in the electronic properties lead to changes in the photophysical properties of the material, resulting in changes in the shape and intensity of the spectrum. figure 2 It is the UV diffuse reflectance spectrum of g-C3N4 and g-C3N4 / SiO2 composite photocatalyst. It can be seen from the figure that the band edge of the composite photocatalyst g-C3N4 / SiO2 has an obvious red shift. This is because SiO2 can increase the absorption of the material in the visible light region. These characteristics are conducive to the improvement of the visible light activity of g-C3N4 / SiO2. .

[0027] Rhodamine B dye and 2,4-dichlorophenol were used as target...

Embodiment 3

[0028] Embodiment 3: the ability of the prepared sample to degrade rhodamine B.

[0029] Taking rhodamine B as the target pollutant, the catalytic activity of g-C3N4 and g-C3N4 / SiO2 composite photocatalysts was studied. from image 3 It can be seen that all the g-C3N4 photocatalysts modified by SiO2 showed a higher photocatalytic reaction rate than the original g-C3N4, and C3N4 / SiO2-5 showed the highest photocatalytic activity, which was about the original g-C3N4 4.81 times.

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Abstract

The invention relates to a C3N4/SiO2 heterojunction photocatalyst and a preparation method thereof. The method comprises the following steps that 2 g of melamine and a certain mass of nanosilicon dioxide are weighed; 10 ml of deionized water is added into the mixture; ultrasonic dispersion is performed for 4 h; the obtained suspension is stirred at the temperature of 90 DEG C for 12 h; then, the obtained solid is heated to 540 DEG C at the heating speed of 4 DEG C per min; the temperature is kept constant for 4 h; after natural cooling, the C3N4/SiO2 heterojunction photocatalyst is obtained. The C3N4/SiO2 heterojunction photocatalyst has the excellent organic pollutant degradation performance under visible light. According to the preparation method, the raw materials are cheap, and the method is simple, so that the product cost is effectively lowered, the visible light absorption range is enlarged due to composition of C3N4 and SiO2, the sunlight utilization rate is increased, and the high practical value and application prospect are achieved.

Description

technical field [0001] The invention relates to a C3N4 / SiO2 heterojunction photocatalyst and a preparation method thereof, belonging to the technical field of photocatalytic material research. Background technique [0002] With the continuous development of human society, the problem of environmental pollution has become increasingly prominent. As an advanced oxidation technology, photocatalytic technology has the advantages of low energy consumption, non-toxic and harmless, and high efficiency compared with traditional adsorption, chemical oxidation, and incineration methods. Utilizing electrons and holes generated by semiconductors under light to efficiently and completely mineralize organic pollutants into carbon dioxide and water is a promising pollutant treatment technology. [0003] In 1972, Japanese scientist Fujishima first reported the experiment of using titanium dioxide as an electrode to split water by light. A new window is opened for solving energy problems. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30
CPCB01J27/24B01J35/004C02F1/30C02F2305/10
Inventor 陈代梅郝强牛秀秀郝思濛乜长顺邹维丁浩
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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