Aurivillius Bi7Fe3-xNixTi3O21 nanostructure towards recyclable photocatalysts
A photocatalyst in practical application should integrate together various functions including visible light response and a feasible and economic recyclability. Herein, a kind of six-layered Aurivillius oxide with narrow band gap and ferromagnetism (FM) was investigated. Ni-doped Bi7Fe3Ti3O21 (Bi7Fe3-xNixTi3O21: BFNTO-x, x=0.1, 0.4, 0.6, and 1) nanostructures have been synthesized by a hydrothermal method, where Ni substitution for Fe can enhance the FM and specific surface area, as well as improve the photocatalytic activity. The BFNTO-0.6 nanostructure exhibit the maximum saturated magnetization of 2Ms ~ 3.58 emu/g at room temperature, which enables the nanostructure fully recyclable simply using a bar magnet. This research may open a new way for the development of new visible-light-induced photocatalysts because the Aurivillius oxide with layer structure has powerful potential in optimizing the structure and properties by doping.