Ball milled h-BN: An efficient holes transfer promoter to enhance the photocatalytic performance of TiO2

► High performance h-BN/TiO2 composite photocatalysts were prepared by ball milling process. ► The activity of TiO2 could be improved substantially by coupling with a proper amount of milled h-BN. ► The h-BN surface is negatively charged after grinding ► The transfer of hole can be promoted by the negatively charged h-BN surface.