Method for preparing carbon nano material by micro wave radiation of coal

Abstract

The present invention discloses microwave irradiation process of preparing nanometer carbon material, including great specific surface area active carbon and quasi one-dimensional nanometer carbon material. The preparation process of great specific surface area active carbon includes the steps of: mixing washed coal and activator in certain ratio and milling, irradiating in a microwave oven to heat, burn and arc, water washing and recovering activator, acid pickling, water washing and stoving. The preparation process of quasi one-dimensional nanometer carbon material includes the steps of: mixing washed coal and catalyst in certain ratio and milling, irradiating in a microwave oven to heat, burn and arc, and purifying. The present invention has short preparation period, low power consumption, low cost, less pollution and easy use in industrial production.

Description

Technical field [0001] The invention belongs to the fields of nano material technology and microwave chemistry, and relates to a method for preparing carbon nano materials, in particular to the preparation of high specific surface area activated carbon and quasi-one-dimensional carbon nano materials by microwave irradiation of coal. Background technique [0002] Activated carbon is widely used in water treatment, air purification, precious metal extraction, etc. In addition to the above applications, activated carbon with high specific surface area can also be used for energy storage in super capacitors. The traditional activated carbon production method has high energy consumption and serious pollution, and many countries have restricted its application. Patent 931146937.2 discloses a "microwave radiation method to produce powdered activated carbon" method, which impregnates wood chips with phosphoric acid or zinc chloride solution, and then uses microwave radiation to prepare a...

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Problems solved by technology

Patent 01122772.9 announced "Preparation and Device of Carbon Nanomaterials", which is to inject carbonaceous materials such as coal and catalysts directly into the plasma jet to prepare carbon nanomaterials. The raw material cost of this method is low, but the price of the plasma generator is expensive. High production cost; patent 200310105047 announced "a method and device for continuously preparing carbon nanomaterials from coal", and patent 20031010532 announced "a method for preparing nano-carbon fibers from coal". These two methods are treated by arc plasma Coal powder and catalyst, and water vapor as a promoter to prepare quasi-one-dimensional carbon nanomaterials, but this method has electrode burning, resulting in increased costs; low-cost, large-scale preparation of quasi-one-dimensional carbon nanomaterials has important practical significance

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