Influence of the precipitation pH on the compositions and properties of Bi-based oxyiodide photocatalysts

▶ BiOI, Bi4O5I2, Bi7O9I3 and Bi5O7I were obtained via a precipitation-filtration process followed by hydrothermal treatment. ▶ The compositions of the bismuth oxyiodides could be controlled by adjusting the precipitation pH values. ▶ All the bismuth oxyiodides exhibit photocatalytic activity on decomposing methyl orange.