Modified biochars have a large specific surface area, a tunable pore structure, and abundant active functional sites, which enable them to effectively remove antibiotics from the environment. However, systematic research on the contribution of different properties of modified biochars to the adsorption and degradation of antibiotics has not been carefully investigated. To clarify the contribution of adsorption and degradation of ciprofloxacin （CIP） by persistent free radicals （PFRs） and the microporous structure of metal-impregnated modified biochars during the removal process, nickel-modified and zinc-modified biochars were prepared under pyrolysis conditions of 500 ℃ and 800 ℃, respectively. Nickel-modified biochar pyrolyzed at 500 ℃ （NCS500） significantly improved the PFR signal intensity, while the specific surface area of zinc-modified biochar pyrolyzed at 800 ℃ （ZCS800） was significantly increased （1 030.94 m