Preparation method for nonmetal-doped carbon material for catalytic reduction of dilute nitric acid in water

The invention discloses a preparation method for a nonmetal-doped carbon material for catalytic reduction of dilute nitric acid in water, wherein the preparation method comprises the steps: adding a nonmetal reagent into an ethanol aqueous solution with a certain volume fraction, continuously stirring under a water bath condition until the nonmetal reagent is uniformly dispersed, and then adding a certain amount of powdery carbon material; and after stirring, aging and drying, placing in a tubular furnace, calcining and promoting the high-temperature decomposition of the nonmetal reagent and doping in a carbon material main body at the same time. A sequencing batch type gas-liquid contact reaction kettle is adopted, reaction is carried out under the conditions that the reaction temperature is 60-80 DEG C, the reaction pressure is 0.2-0.4 MPa, the stirring speed is 300-600 rpm, the mass fraction of methanol in a liquid phase is 50%-80%, and the mass fraction of nitric acid is 2%-10%, NO-N2 mixed gas with the v