Electrospinning visible light response Bi2MoO6/Ag3PO4 composite photocatalytic nanofibers with enhanced photocatalytic and antibacterial activity

Abstract

Due to its significant biocompatibility and environmental friendliness, the composite of heterojunction photocatalyst and natural protein is a promising material in the field of photocatalysis. For the first time, direct Z-scheme Bi2MoO6/Ag3PO4 composites with different concentrations of Ag3PO4 were successfully fabricated by an in-situ deposition method, and Bi2MoO6/Ag3PO4@silk fibroin (BMO/APO@SF) films were further constructed by electrospinning technology to explore the photocatalytic activity of heterojunction photocatalysts. The results of various characterizations confirmed that improved photocatalytic performance, including efficient charge separation, and a widened visible light absorption range, could be attributed to the formation of a heterojunction structure between Bi2MoO6 and Ag3PO4, which considerably promoted photocatalytic activity for ciprofloxacin (CIP) degradation. According to the analysis of degradation products measured by Q-TOF, possible CIP degradation pathways were proposed. Density functional theory (DFT) calculation and Laplacian bond order (LBO) analysis were consistent with the results of Q-TOF. Through trapping experiments, the significant contribution of O2– to BMO/APO@SF was demonstrated. Moreover, the antibacterial rates of Bi2MoO6/15Ag3PO4@SF (BMO/15APO@SF) against Escherichia coli and Staphylococcus aureus were greater than 94.36% and 95.72%, respectively, indicating that BMO/15APO@SF had excellent antibacterial performance.