Degradation of antibiotic norfloxacin in aqueous solution by visible-light-mediated C-TiO2 photocatalysis

► Vis/C-TiO2 process was employed to degrade norfloxacin for the first time. ► An original schematic diagram for deciphering the catalyst surface property was proposed. ► OH radicals are verified to play a major role in the norfloxacin decomposition. ► Hole scavenger of ammonium did not show negative influence. ► Fluoride presented a unique restriction in the norfloxacin decay.