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

Xiaohui Wu,Leitao Cao,Jun Song,Yang Si,Jianyong Yu,Bin Ding

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 .