Abstract

As a visible-light-driven photocatalyst, BiOI has aroused considerable attention in light of its unique properties and promising application aspect in wastewater treatment. However, photocatalytic activity of BiOI needs to be further enhanced to meet the practical application owing to low redox capacity of carriers. In this work, BiOI was baked at the different temperature, and the catalysts were studied by various approaches. The corresponding catalytic performance was investigated by destruction of rhodamine B (RhB). The results demonstrate that BiOI can occur crystal transformation: BiOI→Bi4O5I2→Bi5O7I during the baking process, in-situ forming BiOI/Bi4O5I2 and Bi4O5I2/Bi5O7I heterojunctions, inducing enrichen oxygen vacancies (OVs) and accelerating the formation of ·O2−. Photocatalytic activity measurement reveals that Bi4O5I2/Bi5O7I heterojunctions obtained from baking BiOI at 500 °C have the highest activity, which is 13-fold of that of the reference BiOI. This work paves way for in-situ construction of heterojunctions by phase transformation through baking.

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