Preparation method and application of leaf-based biomass carbon aerogel

The invention belongs to the technical field of composite materials, relates to preparation of carbon aerogel, and especially relates to a preparation method and an application of leaf-based biomass carbon aerogel. The method comprises the following steps: 1, carrying out cleaning and drying pretreatment on leaves, and grinding and filtering the pretreated leaves to obtain a bright-green hydrogel precursor; adding the hydrogen precursor into a 3-8% alkali solution, cleaning the hydrogel precursor, and filtering out soluble impurities to obtain a purified hydrogel precursor; adding the hydrogel precursor into a manganese-oxygen nanowire dispersion with the mass percentage of 10-30%,, adding the obtained black hydrogel precursor into a carbonate solution to form a hard biomass hydrogel; and freeze-drying the hard biomass hydrogel to obtain biomass aerogel, and carrying out high temperature pyrolysis in an inert gas atmosphere for 1-4 h to obtain the leaf-based biomass carbon aerogel. The method adopting the gre