Preparation method of bamboo-like nitrogen-doped carbon nanotubes loaded with metal monoatoms and nanoparticles
A nanoparticle and metal-loaded technology, which is applied in chemical instruments and methods, catalyst activation/preparation, organic chemistry, etc., can solve the problems of highly toxic cyanide and cumbersome preparation process, and achieve high reaction yield and simple process , low cost effect
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[0029] The preparation process of the present invention is as follows, (1) using 2-methylimidazole, metal salts, and zinc-containing compounds as precursors, preparing a mixture containing ZIFs single crystals by ball milling, (2) obtaining supported metal single atoms by high temperature pyrolysis and nanoparticle bamboo-like nitrogen-doped carbon nanotubes.
[0030] The preparation process of the present invention is simple, easy to prepare on a large scale, and the obtained product has excellent photothermal conversion performance and highly active multifunctional sites, and bamboo-shaped nanotubes are easy to expose more internal active sites and improve mass transfer efficiency; metal single atoms And nanoparticles are beneficial to increase the ability of synergistic catalysis. These characteristics make it have great potential application value in the fields of micro-nano reactor and synergistic catalysis.
[0031] Among them, the metal salt Ni(NO 3 ) 2 ·6H 2 O, Ni(N...
Embodiment 1
[0033] (1) Add 28mmol of 2-methylimidazole, 1mmol of Ni(NO 3 ) 2 ·6H 2 0, 5mmol of zinc oxide (the total amount of reactants is 3.0g) and 10 grinding balls (diameter 0.5cm), ball milled for 3h under the condition of 1000r / min at the ball milling jar speed, to obtain a mixture containing ZIFs single crystal.
[0034] figure 1 It is an SEM photo obtained by scanning the mixture containing ZIFs single crystal with a FEI Nano SEM 450 scanning electron microscope. It can be seen from the figure that the single crystal ZIF presents a rhombic dodecahedral structure with a particle size of 200-1000nm.
[0035] (2) Place the resulting mixture containing ZIFs single crystals in a quartz boat, and heat it in a tube furnace at 5°C min -1 Raise from room temperature to 1000° C. for 3 hours, and cool down to room temperature naturally to obtain metal single atoms and nanoparticle bamboo-shaped nitrogen-doped carbon nanotubes.
[0036] figure 2 and image 3 The SEM and STEM photos ob...
Embodiment 2
[0043] (1) Add 28mmol of 2-methylimidazole, 1mmol of Ni(NO 3 ) 2 ·6H 2 0, 5mmol of zinc hydroxide (the total amount of reactants is 3.1g) and 10 grinding balls (diameter 0.5cm), ball milling for 3h at a rotating speed of 800r / min to obtain a mixture containing ZIFs single crystal.
[0044] (2) Place the resulting mixture containing ZIFs single crystals in a quartz boat, and heat it in a tube furnace at 5°C min -1 Raise from room temperature to 1100° C. for 2 hours, and cool down to room temperature naturally to obtain supported metal single atoms and nanoparticle bamboo-shaped nitrogen-doped carbon nanotubes.
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