Title
Ball milled h-BN: An efficient holes transfer promoter to enhance the photocatalytic performance of TiO2
Author
Xianliang Fu, Yingfei Hu, Yunguang Yang, We Liu, Shifu Chen
Year
2013
Journal
Journal of Hazardous Materials
Abstract
High activity hexagonal-BN (h-BN)/TiO2 composite photocatalysts were prepared by ball milling method. The structural and optical properties of the samples were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectra (DRS), and fluorescence emission spectra. The effect of the loading amount of h-BN and the ball milling time on the photocatalytic degradation of Rhodamine B (RhB) and methylene blue (MB) was investigated. The results indicated that the photocatalytic activity of TiO2 could be improved substantially by coupling with a proper amount of milled h-BN. The optimal loading amount of h-BN was found to be 0.5 wt% and the milling time was 30 min. Under this condition, the photocatalytic removal efficiencies of TiO2 for RhB and MB could be increased as high as 15 and 8 times. The role of the milling process and the mechanism for the enhancements was finally discussed in terms of creation of negatively charged h-BN surface and promotion the separation of photoinduced holes, respectively.
Instrument
FP-6500
Keywords
Fluorescence, Materials