Preparation method of doped graphene coated transition metal carbide nanocapsule and application of nanocapsule in microwave catalysis
A graphene-coated, transition metal technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. simple effect
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Embodiment 1
[0026] About 40 g of titanium blocks were placed on the anode of the automatic control DC arc plasma equipment. Titanium is a solid metal block with a purity of 99.9%. The graphite electrode is used as the arc cathode, and argon:methane:nitrogen with a volume ratio of 400:200:1 is introduced to make the pressure of the reaction chamber reach 5×10 4 Pa. Turn on the power supply and start arcing to evaporate the titanium block for 10 minutes, and the obtained nitrogen-doped graphene-coated titanium carbide nanocapsules are deposited on the wall of the furnace cavity. After the reaction product is cooled to room temperature, a small amount of air is introduced for passivation operation to obtain nitrogen-doped graphene-coated titanium carbide nanocapsules.
[0027] Prepare 100 mg / L nitrogen-doped graphene-coated titanium carbide nanocapsules and 5 mmol / L rhodamine B aqueous dispersion, use 500 W, 2.45 GHz microwave to irradiate the dispersion for 5 min, and test the rhodamine B...
example 1
[0028] The XRD pattern of the nitrogen-doped graphene-coated titanium carbide nanocapsule that example one obtains is as follows figure 1 shown. It is determined from the diffraction peaks in the figure that the main phase in the nitrogen-doped graphene-coated titanium carbide nanocapsule structure is titanium carbide, and the content of nitrogen element is very small, which cannot be reflected in XRD.
[0029]The TEM figure and N element distribution figure of the nitrogen-doped graphene-coated titanium carbide nanocapsule that example one obtains are as follows: figure 2 shown. It can be seen that the titanium carbide nanoparticles are covered with 2~3 layers of graphene carbon, and the graphene carbon layer bends along with the bending of the titanium carbide crystal surface. The distribution of N element in graphene-coated titanium carbide nanocapsules is relatively uniform.
Embodiment 2
[0031] Take about 200 g of titanium blocks and place them on the anode of the automatic control DC arc plasma equipment, use the graphite electrode as the arc cathode, and feed argon:methane:nitrogen with a volume ratio of 20:10:1 to make the pressure of the reaction chamber reach 3.5 ×10 4 Pa. Turn on the power supply and start arcing to evaporate the titanium block for 20 minutes, and the obtained nitrogen-doped graphene-coated titanium carbide nanocapsules are deposited on the wall of the furnace cavity. After the reaction product is cooled to room temperature, a small amount of air is introduced for passivation operation to obtain nitrogen-doped graphene-coated titanium carbide nanocapsules.
[0032] Prepare 50 mg / L nitrogen-doped graphene-coated titanium carbide nanocapsules and 100 mmol / L rhodamine B aqueous dispersion, use 700 W, 2.45 GHz microwave to irradiate the dispersion for 10 min, and test the rhodamine B content to calculate its microwave catalytic performanc...
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