Preparation method of iron-nitrogen co-doped biomass carbon material catalyst

The invention relates to the field of water treatment, and discloses a preparation method of an iron-nitrogen co-doped biomass carbon material catalyst. The iron-nitrogen co-doped biomass carbon material is used for advanced oxidation water treatment, and the method mainly comprises the following steps: 1, pretreatment: cleaning a biomass raw material kelp, drying, and crushing; 2, taking a certain amount of the raw materials subjected to earlier-stage treatment, and carrying out hydrothermal reaction; 3, taking the treated material, dipping in an iron solution, centrifugally washing, and drying; 4, uniformly grinding a nitrogen-containing precursor and the dried solid together, and carrying out first high-temperature calcination in a tubular furnace; 5, carrying out acid pickling treatment on the solid powder subjected to the first high-temperature calcination; and finally, carrying out secondary high-temperature calcination treatment on the dried solid powder to obtain the iron-nitrogen co-doped biomass car