Controllable Synthesis of Peapod-Like TiO2@GO@C Electrospun Nanofiber Membranes with Enhanced Mechanical Property and Photocatalytic Degradation Ability towards Methylene Blue
Peapod-like titanium dioxide@graphene@carbon (TiO2@GO@C) nanofiber membranes are prepared by electrospinning. Due to the porous structure, large surface area, abundant surface functional groups and excellent thermal conductivity, GO could capsulizes TiO2 nanoparticles to form a pea-like TiO2@GO structure. And then TiO2@GO could be wrapped by the carbon nanofiber during electrospinning process, forming the peapod-like TiO2@GO@C nanofiber membranes. The existrence of peapod-like structure benefits for enhancing the crystallinity of TiO2, and preventing the phase transformation of TiO2 from anatase to rutile phase at the same time. Furthermore, on the basis of excellent carrier transport property of GO, the peapod-like TiO2@GO@C structure could also improves the light absorption, reduces recombination of hole-electron pairs, and improves the carriers transport and finally photocatalytic degradation property of methylene blue. Besides, the pea-like TiO2@GO structure shows a dispersion strengthening effect in the carbon nanofibers, preventing the carbon nanofibers from fracture. Particularly, through optimizing the heat temperature and additional amount of GO, the peapod-like TiO2@GO@C nanofiber membranes with 0.3 wt.% GO show a excellent photocatalytic degradation efficiency of 98.5% in 3 h, and an high strength of 356.07 cN/dtex.