Elemental mercury removal in coal-fired power plants is the key to global mercury pollution control, and photocatalytic oxidation is an effective and stable method. As a typical bismuth-based photocatalyst, BiOIO₃ has a large band gap which is not conducive to the absorption and utilization of visible light, and its specific surface area also limits the diffusion and adsorption of reactants. In this work, pink BiOIO3 (PB) was first prepared successfully via vacuum calcination under absolute pressure of 1*10⁻³ Pa. The specific surface area of pink BiOIO₃ is significantly increased to 44.52 m²/g, which is 1.5-times compared with the traditional BiOIO₃ prepared by hydrothermal method (only 29.60 m²/g). Abundant oxygen vacancy defects exist on sample surface, and the formed local BiOI Zero-dimensional (0-D) nanodots provide heterojunction-like effect combined with the BiOIO₃, obtaining better photocatalytic property in the oxidation of elemental mercury. The as-prepared pink BiOIO₃ and the preparation technology also have strong application potential in the field of energy and environment.

燃煤电厂元素汞去除是全球汞污染控制的关键，光催化氧化是一种有效且稳定的方法。作为典型的铋基光催化剂，BiOIO ₃的带隙较大，不利于可见光的吸收和利用，其比表面积也限制了反应物的扩散和吸附。本工作首次在1*10 ^-3 Pa的绝对压力下通过真空煅烧成功制备了粉红色BiOIO3 (PB) 。粉红色BiOIO ₃的比表面积显着提高至44.52 m ² /g，是1.5倍与传统的水热法制备的BiOIO ₃相比（仅29.60 m ²/G）。样品表面存在丰富的氧空位缺陷，形成的局部BiOI零维（0-D）纳米点与BiOIO ₃结合提供了类异质结效应，在元素汞的氧化中获得了更好的光催化性能。所制备的粉红色BiOIO ₃及其制备技术在能源和环境领域也具有很强的应用潜力。