科研之友
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摘要
MWCNT/BiVO4 and RGO/BiVO4 heterojunctions were synthesized by the sol-gel method, and the photocatalytic activity of MWCNT/BiVO4 and RGO/BiVO4 were evaluated by monitoring the degradation of RhB in a heterogeneous photocatalytic reactor. The catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy, scanning electron microscopy, Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results indicated that a series of heterojunction structure composites were successfully synthesized, the heterojunction structure playing a crucial role in the electron-hole recombination. The crystal structure of BiVO4 was still monoclinic after the doping of MWCNT and RGO according to the XRD analysis, while the active sites of MWCNT/BiVO4 and RGO/BiVO4 were more than pure BiVO4. The RGO with a two-dimensional carbon sheet expressed higher performance than MWCNT with a one-dimensional carbon sheet for BiVO4 because the layered structure of the RGO had a stronger electron-trapping capability than MWCNT. The optimal MWCNT content was 2%, and the 6% RGO/BiVO4 showed the highest photocatalytic degradation efficiency of RhB. The photocatalytic degradation efficiency remained above 80% after five cycle tests.
- 出版日期2017-11
- 单位中国石油大学（华东）
