Magnetic carbon nano-microsphere taking lignin as carbon source and preparation method of magnetic carbon nano-microsphere

The invention belongs to the technical field of nanocomposites and discloses a magnetic carbon nano-microsphere taking lignin as a carbon source and a preparation method of the magnetic carbon nano-microsphere. The preparation method includes: dissolving the lignin and ferric acetylacetonate in N,N-dimethylformamide to obtain an electrostatic lignin spray solution containing the ferric acetylacetonate, and then obtaining the lignin nano-microsphere containinging the ferric acetylacetonate through electrostatic spraying; performing pre-oxidation on the obtained lignin nano-microsphere under the temperature ranging from 250DEG C to 280DEG C prior to carbonization treatment under the temperature of 400DEG C to 900DEG C to obtain the magnetic carbon nano-microsphere taking the lignin as the carbon source. The preparation method has the advantages that raw materials are easy to obtain, energy conservation and environment protection is achieved, the obtained product is good in microstructure and dispersing and magnetic performance, and good application prospect in fields of information, energy sources, detection, biology and the like is achieved.