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Three-component nanocomposites (Fe₃O₄/Pd/mpg-C₃N₄) have been systematically synthesized using a three-step solution method for the photocatalytic bacterial decontamination. The mesoporous g-C₃N₄ nanosheets (mpg-C₃N₄), which were prepared by the acid treatment, showed a great improvement in photocatalytic performance. The photoluminescence intensity of the mpg-C₃N₄ nanosheets was disclosed to drop about 60% from the value of normal g-C₃N₄ nanosheets. Decoration of mpg-C₃N₄ with palladium (Pd) nanoparticles led to the effective suppression of carrier recombination and the carrier migration to Fe₃O₄ nanoparticles. It was revealed that the three-component nanocomposites degraded 99.9% of <i>E. coli</i> and 99.8% of <i>S. aureus</i> bacterial strains within 2 h of solar light irradiation at a 100 &#956;g/mL concentration, demonstrating their superb photocatalytic antibacterial activity. In addition, the nanocomposites could be easily separated from the bacterial cells and repeatedly used for photocatalytic bacterial degradation with good recyclability. The strong photon-induced antibacterial activity and good recyclability of the three-component nanocomposites may represent their potential as a promising antibacterial photocatalyst.