Hollow annular carbon nitride photocatalyst and preparation method thereof
A catalyst and carbon light technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, nitrogen and non-metallic compounds, etc., can solve the problems of low sunlight absorption efficiency and low specific surface area
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Embodiment 1
[0032] Example 1 Preparation of Hollow Ring Graphite Phase Carbon Nitride Photocatalyst
[0033] Using melamine / cyanuric acid supramolecule as precursor, the ring-shaped graphite-like carbon nitride with defects was prepared by introducing hydrogen: nitrogen (5%: 95%) atmosphere.
[0034] Concrete preparation process steps are as follows:
[0035] 1) Preparation of supramolecular solid
[0036] 3.96mmol melamine was dissolved in 20mL DMSO. At the same time, 3.96 mmol cyanuric acid was dissolved in 10 mL DMSO. Then the above two solutions were mixed, stirred at 120°C for 20 minutes, filtered to obtain a white supramolecular solid, washed with ethanol, and then dried at 60°C for 4 hours to obtain a supramolecular powder.
[0037] 2) Pyrolysis reaction
[0038] Put the supramolecular powder obtained in the previous step into a 30mL alumina porcelain boat, and cover it with a porcelain boat of the same size to retain the self-generated small molecule gas. There is a gap betwe...
experiment example 1
[0042] Characterization of experimental example 1 material
[0043] XRPD pattern and IR test
[0044] The CN-H and CN-N carbon nitride samples obtained in Example 1 and Comparative Example 1 were respectively subjected to XRD spectrum (Cu target source) and IR spectrum testing.
[0045] see results figure 2 , figure 2 (a) is the X-ray diffraction pattern, (b) Fourier transform infrared spectrum. figure 2 a is the X-ray diffraction pattern (XRD), the diffraction peak at 12.9 ° corresponds to the (100) plane, and this peak is a characteristic diffraction peak formed by the internal structure of the triazine unit; the diffraction peak at 27.8 ° corresponds to ( 002), the peak is formed by the stacking of aromatic ring interlayer structures. The interlayer distance of aromatic rings of CN-H is about 0.323nm. from figure 2 It can be seen in a that the intensity of the characteristic diffraction peak of CN-H at 12.9° becomes weaker, indicating that the intralayer structure...
experiment example 2
[0060] Experimental example 2 morphology analysis
[0061] The structure and morphology of the CN-N and CN-H carbon nitrides of Example 1 and Comparative Example 1 were observed by scanning electron microscope and transmission electron microscope. structured as Figure 5 and Image 6 shown.
[0062] Figure 5 Scanning electron microscope (SEM) spectra of CN-N and CN-H samples. Figure 5 The results in A and B show that CN-N is a spherical structure with an average diameter of about 3-5 μm. The spherical structure of CN-N is formed by the aggregation of molecular self-assembled nanoplates. Figure 5 CN-H is a hollow ring-like graphitic carbon nitride whose particle size is smaller than that of CN-N. It shows that under the mixed atmosphere of hydrogen: nitrogen (5%: 95%), the surface morphology of the synthesized carbon nitride has changed significantly.
[0063] Image 6 It is the transmission electron microscope image (TEM) of CN-N and CN-H. Image 6 Among them, a, b,...
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