Preparation and purification method of coal-based carbon nanotubes

Abstract

The invention belongs to the technical field of preparation of carbon nanotubes, and provides a preparation and purification method of a coal-based carbon nanotubes. The method comprises the followingsteps: taking coal as a base, mixing potassium chloride and potassium iodide to obtain a catalyst, uniformly mixing the coal and the catalyst, paving an obtained mixture in a reactor, introducing generated gas A, and performing microwave heating to obtain coal-based carbon nanotubes on the surface of the coal; cooling the coal-based carbon nanotubes to 400 DEG C, introducing purified gas B for purification, and when the temperature of the coal-based carbon nanotubes is higher than 550 DEG C, stopping introducing the purified gas B and introducing nitrogen for cooling to 400 DEG C; repeating the process used for generating and purifying the coal-based carbon nanotubes, and repairing and prolonging the carbon nanotubes until the mass fraction of the coal is below 30%; and washing with an acid, washing with distilled water, and heating at 60-90 DEG C to remove water, thereby obtaining the pure coal-based carbon nanotubes. According to the preparation and purification method, a large number of coal-based carbon nanotubes are prepared on taking coal as the base, so that coal-based templates are reduced, and the purity of the coal-based carbon nanotubes is improved as much as possible.The technology and the purification process for preparing the carbon nanotubes from the coal base are perfected, so that the coal-based carbon nanotubes has more economic advantages and product advantages.

Description

technical field [0001] The invention belongs to the technical field of preparation of carbon nanotubes, in particular to a method for preparing and purifying coal-based carbon nanotubes, in particular to a method for reducing the quality of coal for synthesizing carbon nanotubes with coal as the base, and increasing carbon nanotubes Tube length and number of craft. Background technique [0002] Carbon nanotubes are widely used because of their unique one-dimensional structure in terms of mechanics, electricity, heat, and adsorption. However, the high price of carbon nanotubes severely limits their large-scale application market. The development of technologies for mass-preparing low-cost carbon nanotubes has become one of the most challenging directions in the field of carbon nanomaterials. [0003] Coal-based carbon nanotubes refer to carbon nanotubes containing coal-based materials produced on the basis of coal. Both ZL201810309097.2 and ZL 201810590741.8 are processes fo...

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Problems solved by technology

However, the use of halogen-containing compounds is problematic due to the inconvenience of halogen gas disposal, environmental risks and high input costs

[0006] Although there are currently some reported methods that can also obtain high-purity single-walled carbon nanotubes, the raw materials used are often samples with relatively low impurity content, which is not economical. In addition, the method of ultra-high temperature calcination under high vacuum conditions is used The conditions for obtaining high-purity single-walled nanotubes are very harsh, and it is difficult to achieve and popularize; moreover, most methods are not suitable for the purification of a large number of samples (single processing volume > 200mg), and with the continuous application of carbon nanotubes Expansion, the demand for high-purity tubes is growing rapidly, so it is urgent to establish a purification process with mild conditions suitable for industrial mass production

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