BiOBr Nanosheets Prepared from a Mixture of Bi(NO ₃ ) ₃ ·5H ₂ O and Bi-MOFs with Exposed (110) Facets for Photocatalytic Degradation of Organic Dye

Photocatalysis is an environmentally sustainable technology that utilizes solar energy and exhibits great potential for wastewater treatment. However, insufficient active sites and fast photogenerated carrier complexation rates limit its applications. In this study, double bismuth-sourced-induced construction BiOBr hierarchical nanosheets with a high-exposure (110) facet for photocatalytic degradation of organic dyes were synthesized. The best sample (Bi/M0.1) can degrade 98% of the RhB within 9 min. The excellent photocatalytic performance can be attributed to the formation of hierarchical nanosheets, which reduced the carrier transport paths and increased the exposure of active sites. The Bi/M0.1 sample exhibited good cycling stability in the photocatalytic experiments. The results of the free radical trapping experiments and electron paramagnetic resonance experiments indicated that the main active species for degrading RhB were h+ and •O2–, which provided an idea for the design and preparation of Bi-based photocatalysts.