Preparation method and application of biomass fluorescence carbon quantum dot dispersion liquid

The invention provides a preparation method and application of a biomass fluorescence carbon quantum dot dispersion liquid, and relates to the technical field of the preparation of nanometer materialsand lubricating improving agents. The preparation method comprises the steps that biomass raw materials are crushed by a crusher, the biomass raw materials are washed with absolute ethyl alcohol anddried, and mixed with a strong alkali solution to be heated, then washing, drying and high-temperature calcination are carried out, after the biomass raw materials are taken out and subjected to ball-milling, a strong oxidant and a strong acid solution are added, and heating reaction is carried out; then the reaction liquid is diluted by deionized water, the pH value is adjusted to be neutral, rotary steaming and dialysis are carried out, and a biomass carbon quantum dot solution is obtained; and finally, the biomass carbon quantum dot solution is evenly mixed with organic amine compound, hydrothermal reaction is carri