Thorn-like flexible Ag2C2O4/TiO2 nanofibers as hierarchical heterojunction photocatalysts for efficient visible-light-driven bacteria-killing.

Abstract

TiO2-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 Ag2C2O4/TiO2 heterostructured nanofibrous membranes (NMs) that were composed of thorn-like nanofibers through electrospinning technique followed by successive ionic layer adsorption and reaction (SILAR) process. Ag2C2O4 nanoplates were firmly anchored on the surface of TiO2 and the obtained Ag2C2O4/TiO2 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 Ag2C2O4, forming a new plasmonic heterojunction photocatalyst. By virtue of the hierarchical structure, enhanced visible light absorption and efficient charge carriers separation, Ag2C2O4/TiO2 NMs possessed high bactericidal efficiency of >99.999% within 30\u202fmin, strong reactive oxygen species (ROS) producing capability (1510\u202fμg\u202fg-1 and 659\u202fμg\u202fg-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.