Covalent　carbon　nitride　polymers　were　applied　as　metal-free　robust　catalysts　for　the　inactivation　of　Escherichia　coli　K-12　(E.　coli),　a　common　Gram-negative　bacterium,　under　visible　light　illumination.　The　results　demonstrated　that　the　creation　of　antibacterial　function　on　the　surface　of　conjugated　polymers　has　now　become　possible.