Method for controllably loading precious metal nanometer material on multi-walled carbon nanotube
A technology of multi-walled carbon nanotubes and nanomaterials, applied in the field of controllable loading of ultra-small precious metal nanomaterials on the surface of multi-walled carbon nanotubes, can solve the problems of loss of catalytic activity and catalyst reduction, and achieve high catalytic activity and good stability , The preparation method is simple and easy to implement
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Embodiment 1
[0027] This embodiment includes the following steps:
[0028] Multi-walled carbon nanotubes were prepared by catalytic assisted CVD. Fe-Mo / MgO is selected as the catalyst, and carbon dioxide is transported into a tube-type high-temperature furnace by using argon-hydrogen mixed gas, and heated at 1000°C for 30 minutes to obtain multi-walled carbon nanotubes.
[0029] Weigh 1 mmol of the prepared multi-walled carbon nanotubes and disperse them into 50 mL of 2 mol / L HCl, and then ultrasonicate (600 W) for 2 hours to remove catalyst particles. The acid-treated carbon nanotubes were rinsed repeatedly with deionized water until neutral to remove chloride ions, and then vacuum-dried at 50° C. for 6 hours to obtain purified multi-walled carbon nanotubes. Disperse the purified multi-walled carbon nanotubes in a mixture of 60ml of concentrated nitric acid and concentrated sulfuric acid (1:2), ultrasonically treat for 18h, filter, wash with deionized water and absolute ethanol repeatedl...
Embodiment 2
[0034] This embodiment includes the following steps:
[0035] Multi-walled carbon nanotubes were prepared by catalytic assisted CVD. Fe-Mo / MgO is selected as the catalyst, and carbon dioxide is transported into a tube-type high-temperature furnace by using argon-hydrogen mixed gas, and heated at 1000°C for 30 minutes to obtain multi-walled carbon nanotubes.
[0036]Weigh 1 mmol of the prepared multi-walled carbon nanotubes and disperse them into 50 mL of 2 mol / L HCl, and then ultrasonicate (600 W) for 2 hours to remove catalyst particles. The acid-treated carbon nanotubes were rinsed repeatedly with deionized water until neutral to remove chloride ions, and then vacuum-dried at 50° C. for 6 hours to obtain purified multi-walled carbon nanotubes. Disperse the purified multi-walled carbon nanotubes in a mixture of 60ml of concentrated nitric acid and concentrated sulfuric acid (1:2), ultrasonically treat for 18h, filter, wash with deionized water and absolute ethanol repeatedly...
Embodiment 3
[0039] This embodiment includes the following steps:
[0040] Multi-walled carbon nanotubes were prepared by catalytic assisted CVD. Fe-Mo / MgO is selected as the catalyst, and carbon dioxide is transported into a tube-type high-temperature furnace by using argon-hydrogen mixed gas, and heated at 1000°C for 30 minutes to obtain multi-walled carbon nanotubes.
[0041] Weigh 1 mmol of the prepared multi-walled carbon nanotubes and disperse them into 50 mL of 2 mol / L HCl, and then ultrasonicate (600 W) for 2 hours to remove catalyst particles. The acid-treated carbon nanotubes were rinsed repeatedly with deionized water until neutral to remove chloride ions, and then vacuum-dried at 50° C. for 6 hours to obtain purified multi-walled carbon nanotubes. Disperse the purified multi-walled carbon nanotubes in a mixture of 60ml of concentrated nitric acid and concentrated sulfuric acid (1:2), ultrasonically treat for 18h, filter, wash with deionized water and absolute ethanol repeatedl...
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