TiO 2 -based fibrous membranes as plasmonic heterojunction photocatalysts would hold great promise in the field of water disinfection , however, it still existed a great challenge to design and construct such materials. Here, we presented the fabrication of continuous, hierarchical, and easy-to-recycle flexible Ag 2 C 2 O 4 /TiO 2 heterostructured nanofibrous membranes (NMs) that were composed of thorn-like nanofibers through electrospinning technique followed by successive ionic layer adsorption and reaction (SILAR) process. Ag 2 C 2 O 4 nanoplates were firmly anchored on the surface of TiO 2 and the obtained Ag 2 C 2 O 4 /TiO 2 heterojunction photocatalysts underwent a silent-to-active transition of visible-light response under light irradiation due to the surface plasmon resonance (SPR) effect of Ag nanoparticles derived from Ag 2 C 2 O 4 , forming a new plasmonic heterojunction photocatalyst. By virtue of the hierarchical structure, enhanced visible light absorption and efficient charge carriers separation, Ag 2 C 2 O 4 /TiO 2 NMs possessed high bactericidal efficiency of >99.999% within 30 min, strong reactive oxygen species (ROS) producing capability (1510 μg g −1 and 659 μg g −1 for superoxide radicals and hydroxyl radicals , respectively), and good reusability. This work may offer new insights into the design of antibacterial materials for pathogenic microorganism-contaminated water purification .
Water pollution , deriving from the contamination of pathogenic bacteria, has posed a threat to human's survival and development. Photocatalytic disinfection is being widely studied in decentralized drink water safety, as traditional disinfection technologies are limited by harmful disinfection by-product and excessive energy consumption. Herein, a novel composite membrane (PN/Ag) with plasmonic heterojunction was synthesized for the efficient photocatalytic disinfection through the combination of polyacrylonitrile (PAN), N -doped carbon dots (NCDs)/g-C 3 N 4 and Ag 2 C 2 O 4 by electrospinning technique and successive ionic layer adsorption and reaction (SILAR) process. The surface plasmon resonance (SPR) effect of Ag nanoparticles and Schottky barrier formation between metal and semiconductor contributed to the efficient separation of electron-hole pairs and the generation of reactive species, resulting in outstanding photocatalytic disinfection of PN/Ag composite membranes (7.48 and 7.70 log inactivation of E. coli and S. aureus respectively in 80 min) and good reusability under visible light illumination. Moreover, the potential Z-scheme photocatalytic mechanisms were proposed for PN/Ag system according to the band structure and reactive species analysis. The as-proposed PN/Ag composite membranes may shed light on the design and application of materials in water purification .
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