Molecule modified carbon nitride photocatalyst as well as preparation method and application thereof

A catalyst and carbon nitride technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of small specific surface area and unsatisfactory photocatalytic performance, and achieve high catalyst activity and strong Photocatalytic degradation ability, the effect of simple operation steps

Inactive Publication Date: 2018-11-23
SHENYANG INST OF AUTOMATION GUANGZHOU CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently preparing g-C 3 N 4 The photocatalyst method mainly adopts the high temperature calcination thermal polycondensation method, but the g-C obtained by this method 3 N 4 The specific surface area is small, so the photocatalytic performance is often not ideal

Method used

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  • Molecule modified carbon nitride photocatalyst as well as preparation method and application thereof
  • Molecule modified carbon nitride photocatalyst as well as preparation method and application thereof
  • Molecule modified carbon nitride photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Put 3g of DCDA and 0.07g of DPY in a conical flask, add 15mL of water, heat to 90°C, stir for 1 hour to a clear and transparent solution, transfer it to a petri dish, and dry it in a blast drying oven to obtain a precursor; After being ground into powder, put it in a crucible, calcined in a muffle furnace, the calcining temperature is 550°C, the holding time is 4 hours, and the heating rate is 2.0°C / min to obtain DCN-1; after natural cooling, grind into powder, weigh 1.2 g was filled in a crucible, and calcined again in air atmosphere, the calcining temperature was 500°C, the holding time was 2 hours, and the heating rate was 5°C / min. After natural cooling, a high specific surface area modified carbon nitride photocatalyst DCN-2 was obtained. The photocatalyst prepared in embodiment 1 is carried out XPS, DRS, XRD etc. characterization, the result is as follows Figure 1 to Figure 7 shown.

[0046] in conclusion:

[0047] Figure 1 ~ Figure 3 Shown are the XPS diagra...

Embodiment 2

[0053]Put 3g of DCDA and 0.01g of DPY in a conical flask, add 15mL of water, heat to 80°C, stir for 2 hours to a clear and transparent solution, and continue heating until the water is removed to obtain a precursor; grind it into powder and put it in a crucible, Calcined in a muffle furnace with a calcination temperature of 450°C, a holding time of 6 hours, and a heating rate of 5.0°C / min to obtain modified carbon nitride; after natural cooling, it was ground into powder, and 1.2g was weighed and filled in a crucible. Calcination again in air atmosphere, the calcination temperature is 400°C, the holding time is 4 hours, and the heating rate is 2°C / min. After natural cooling, a high specific surface area modified carbon nitride photocatalyst was obtained.

Embodiment 3

[0055] Put 3g of DCDA and 0.10g of DPY in a conical flask, add 15mL of water, heat to 100°C, stir for 1 hour to a clear and transparent solution, and continue heating until the water is removed to obtain a precursor; grind it into powder and put it in a crucible, Calcined in a muffle furnace, the calcination temperature was 620°C, the holding time was 4 hours, and the heating rate was 1°C / min to obtain modified carbon nitride; after natural cooling, it was ground into powder, and 1.2g was weighed and filled in a crucible. Calcination again in air atmosphere, the calcination temperature is 550°C, the holding time is 1 hour, and the heating rate is 10°C / min. After natural cooling, a high specific surface area modified carbon nitride photocatalyst was obtained.

[0056] Photocatalytic degradation performance verification of p-aniline:

[0057] Add 150mL concentration of aniline solution that is 10mg / L in photoreactor, get 50mg sample that above-mentioned embodiment 1 makes and p...

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Abstract

The invention belongs to the technical field of photocatalyst materials, and discloses a molecule modified carbon nitride photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps that S1, dicyanodiamine and 2,6-diaminopyridine are mixed and dissolved in water; heating, stirring, dissolving and drying are performed to obtain a precursor; S2, the precursor obtained in the S1 is calcined to obtain modified graphite-phase carbon nitride; S3, the graphite-phase carbon nitride obtained in the step S2 is ground into powder; calcination is performed again; modified carbon nitride with high specific surface area is obtained. High-temperature calcination is firstly performed to obtain carbon nitride; then, secondary calcination is performed; oxygen gas in air is used for peeling oxidation, so that carbon nitride is peeled and oxidized; molecule doped carbon nitride with high specific surface area and high catalytic activity is prepared; the specific surface area is large (259.7m<2> / g); the reaction sites are many; high light absorption is realized on sunlight; high photocatalytic degradation capability is realized on organiccontaminants; when the photocatalyst is used for photocatalytic degradation on an aniline containing solution, the complete degradation can be realized within 1h.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst materials, in particular to a molecularly modified carbon nitride photocatalyst and its preparation method and application. Background technique [0002] The rapid development of modern industry has caused the increasingly serious problem of environmental pollution. Therefore, the control and control of environmental pollution is of great significance to the development of the national economy and the realization of sustainable development strategies. The new field of semiconductor photocatalysis has opened up a new way for human beings to develop and utilize solar energy. However, traditional TiO 2 Inorganic semiconductor-based photocatalysts have the disadvantages of low solar energy utilization rate, low photon quantum efficiency and easy deactivation, which seriously restrict the practical application of photocatalytic technology. While graphitic carbon nitride (g-C 3 N 4 ) has good...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCC02F1/30B01J27/24C02F2101/38B01J35/39
Inventor 陈志鸿吕海钦孟庆国苑明哲
Owner SHENYANG INST OF AUTOMATION GUANGZHOU CHINESE ACAD OF SCI
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