Preparation of acid-modified hydrothermal carbon and application of acid-modified hydrothermal carbon in removal of antibiotics in rainfall runoff in bioretention pond

The invention discloses preparation of acid-modified hydrothermal carbon and application of the acid-modified hydrothermal carbon in removal of antibiotics in rainfall runoff in a bioretention pond, the acid-modified hydrothermal carbon is prepared from biomass raw materials and acid solvents with different concentrations in a hydrothermal mode, and the specific method comprises the steps that 1, the biomass raw materials are smashed, sieved, washed and dried, and biomass powder is prepared; 2) dispersing biomass powder in deionized water in parts by weight to form a suspension, and preparing a solution A; acid is diluted to be 0.01 mol/L to 10 mol/L, and a solution B is prepared; and 3) mixing the solution A and the solution B, stirring, transferring into a reaction kettle, carrying out hydrothermal reaction for a certain time to obtain a modified hydrothermal carbon precursor, washing and drying to obtain modified hydrothermal carbon powder, carrying out ball milling on the modified hydrothermal carbon powd