▎ 摘　　要

NOVELTY - Preparing electrospinning of carbon nano fiber comprises uniformly mixing polyacrylonitrile, microwave absorbent and organic solvent to form spinning solution, where the content of polyacrylonitrile in the spinning solution is 8-12 wt.%, the mass ratio of polyacrylonitrile and microwave absorbent is 1:(0.1-0.3), performing electrostatic spinning to the spinning solution to obtain the nano fiber film, carrying out heat treatment to the nano fiber film, pre-oxidizing the polyacrylonitrile in the nano fiber film, thus obtaining the carbon nano fiber precursor, subjecting the carbon nano fiber precursor in the inert gas atmosphere for microwave irradiation heating, and pre-oxidizing polyacrylonitrile carbonization in carbon nano fiber precursor. The microwave absorbent comprises conductive carbon black, active carbon, carbon nano tube and reduced graphene oxide. The organic solvent comprises nitrogen dimethyl formamide, nitrogen dimethyl acetamide and/or dimethyl sulfoxide. USE - The carbon nano-fiber is useful in adsorption, filtering, structure reinforcing material and hydrogen storage and in catalytic and energy storage and conversion fields. ADVANTAGE - The method: is simple, easy to operate, reduces the heat conduction to the energy exchange and reaction degree of relieving influence, short time consumption in the preparation process, less energy consumption, green and environmentally-friendly technique; and is economical.