Fig. 8

Variation of the relative content of KE-7B (C/C₀) vs. irradiation time over ZnO, BiVO₄, and BiVO₄-modifying ZnO with different Bi/Zn molar ratios under visible-light (a) and natural sunlight (b) illumination. c Visible-light spectrum and (d) solar-light spectrum ranging 340~820 nm measured by a movable spectroradiometer