Preparation method and application of acorus calamus-based composite solid carbon source filler

The invention relates to a preparation method and application of a calamus-based composite solid carbon source filler. The preparation method of the acorus calamus-based composite solid carbon source filler comprises the following steps: soaking dried acorus calamus in a sodium hydroxide solution for alkali heat treatment, washing the acorus calamus with clear water, and drying the acorus calamus for later use; the preparation method comprises the following steps: mixing polyvinyl alcohol (PVA) and sodium alginate (SA) in distilled water, pyrolyzing and diluting, and cooling to obtain uniform hydrogel; the preparation method comprises the following steps: adding a beta-hydroxybutyric acid and beta-hydroxyvalerate copolymer (PHBV) and acorus calamus into hydrogel, mixing, putting into a mold, freezing for a period of time, demolding, sequentially carrying out a cross-linking reaction in a mixed solution of a saturated boric acid solution of CaCl2 and a Na2SO4 solution, washing with ultrapure water, and drying