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Three-component nanocomposites (Fe 3 O 4 /Pd/mpg-C 3 N 4 ) have been systematically synthesized using a three-step solution method for the photocatalytic bacterial decontamination. The mesoporous g-C 3 N 4 nanosheets (mpg-C 3 N 4 ), which were prepared by the acid treatment, showed a great improvement in photocatalytic performance. The photoluminescence intensity of the mpg-C 3 N 4 nanosheets was disclosed to drop about 60% from the value of normal g-C 3 N 4 nanosheets. Decoration of mpg-C 3 N 4 with palladium (Pd) nanoparticles led to the effective suppression of carrier recombination and the carrier migration to Fe 3 O 4 nanoparticles. It was revealed that the three-component nanocomposites degraded 99.9% of E. coli and 99.8% of S. aureus bacterial strains within 2 h of solar light irradiation at a 100 μg/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.

Photon-Induced Superior Antibacterial Activity of Palladium-Decorated, Magnetically Separable Fe3O4/Pd/mpg-C3N4 Nanocomposites