Figure 5.
(a) Effect of the concentration of the photocatalyst on hydrogen production over the Bi4Ti3O12−x (350 °C, 60 min) nanosheets under visible-light irradiation (λ > 400 nm); and (b) Effect of various wastes as additives on hydrogen production over the Bi4Ti3O12−x (350 °C, 60 min) nanosheets under visible-light irradiation (λ > 400 nm).