Oxygen‐Doped Graphite Carbon Nitride/MXene Nanofiber Membrane for Enhanced Photocatalytic Bacteriostasis and Degradation

ABSTRACT Organic dyes and drug‐resistant bacteria are posing a potential threat to human health and ecology. Graphite phase carbon nitride (g‐C 3 N 4 ), because of its good light absorption performance, stability, and suitable energy band structure, has potential applications in photocatalysis. Herein, oxygen doped carbon nitride (O‐CN) and MXene Ti 3 C 2 (TC) were physically mixed to form a heterojunction. The effect of the ratio between O‐CN and TC on the photocatalytic performance was studied. Then O‐CN/TC‐2 was dispersed in PVA solution. Subsequently, the mixed solution was electrospinning into flexible nanofiber membranes POCNTC‐2. POCNTC‐2 composite nanofiber membranes were smooth and uniform, and the average diameter of the nanofiber was 390 ± 2.7 nm. The maximum removal efficiency of the composite nanofiber membrane for MB solution (10 mg/L) reached 94.1% within 240 min. Meanwhile, it had favorable cycle stability. According to the bacteriostatic results, the maximum bacteriostatic zone diameters of POCNTC‐2 8% against Escherichia coli and Staphylococcus aureus could reach 24 ± 0.2 and 16 ± 0.2 mm, respectively, and the bacteriostatic rates could reach 92% and 87%, respectively. Overall, the excellent photocatalytic removal of organic materials and antibacterial properties gave the flexible POCNTC membrane great application potential in the field of environmental purification.