Abstract
A novel nonmetal heterojunction, g-C3N4/rGO/PANI, was developed as an efficient antibacterial photocatalyst via a facile multistep fabrication route. We speculated that the g-C3N4/rGO/PANI heterojunction followed a Z-scheme charge transfer mechanism, which was confirmed by the results of UV–vis, XPS, and Mott-Schottky plots techniques. The performance of photocatalytic disinfection for g-C3N4/rGO/PANI was evaluated against the Gram-positive bacteria. Under the visible light irradiation for 1 h, 106 CFU/mL of S. aureus were totally eliminated by the g-C3N4/rGO/PANI, which appeared to be superior than that of g-C3N4 and g-C3N4/rGO. The superior disinfection performance of g-C3N4/rGO/PANI was attributed to the increase electron-hole separation and the photogenerated electrons from the conduction band of g-C3N4 transferred to the π orbital of PANI, with rGO as the electron mediator.
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