Nitrogen and cobalt dual-doped fluorescent carbon quantum dot material and preparation method thereof

The invention discloses a nitrogen and cobalt dual-doped fluorescent carbon quantum dot material and a preparation method thereof, and belongs to the technical field of preparation of fluorescent nano-materials. The preparation method comprises the following steps: 1) weighing a vitamin B12 solid and adding the vitamin B12 solid into de-ionized water to obtain a red transparent solution; 2) putting the solution into a high-pressure reaction kettle; carrying out high-temperature hydrothermal reaction to obtain a hydrothermal product; 3) adjusting the pH (Potential of Hydrogen) of the product obtained after the hydrothermal reaction, centrifuging, carrying out ultra-filtration and collecting filtrate to obtain a nitrogen and cobalt dual-doped fluorescent carbon quantum dot water solution. The nitrogen and cobalt dual-doped fluorescent carbon quantum dot material and the preparation method thereof have the advantages of simple equipment, easiness for obtaining raw materials, low cost, greenness and environment p