1. Controllable synthesis of peapod-like TiO2@GO@C electrospun nanofiber membranes with enhanced mechanical properties and photocatalytic degradation abilities towards methylene blue.
- Author
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Zhang, Qi, Chen, Xing, Wang, Haiyan, Bai, Xuming, Deng, Xiaonan, Yao, Qiming, Wang, Jianmei, Tang, Bin, Lin, Wanming, and Li, Shuangshou
- Subjects
HOLLOW fibers ,DISPERSION strengthening ,CARBON nanofibers ,HEAT treatment ,LIGHT absorption ,THERMAL conductivity ,SURFACE area - Abstract
We prepared peapod-like titanium dioxide@graphene@carbon (TiO
2 @GO@C) nanofiber membranes through electrospinning. Due to the porous structure, large surface area, abundant surface functional groups and excellent thermal conductivity, GO can capsulize TiO2 nanoparticles to form a pea-like TiO2 @GO structure. Subsequently, TiO2 @GO can be wrapped by the carbon nanofiber during an electrospinning process, forming peapod-like TiO2 @GO@C nanofiber membranes. The existence of a peapod-like structure is beneficial 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 the excellent carrier transport property of GO, the peapod-like TiO2 @GO@C structure could also improve the light absorption, reduce recombination of hole–electron pairs, and improve the carrier 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. In particular, by optimizing the heat treatment temperature and additional amount of GO, the peapod-like TiO2 @GO@C nanofiber membranes with 0.3 wt% GO show an excellent photocatalytic degradation efficiency of 98.5% in 3 h, and a high strength of 356.07 cN per dtex. [ABSTRACT FROM AUTHOR]- Published
- 2020
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