Abstract In this work, various bismuth oxyiodides were prepared by in-situ phase transformation and heterostructure construction through a simple calcination method with BiOI as self-sacrificial template, including BiOI/Bi4O5I2 heterojunction, Bi4O5I2, Bi4O5I2/Bi5O7I heterojunction and Bi5O7I. The physicochemical properties of the samples synthesized at different calcination temperatures were analyzed through a series of characterizations. The photocatalytic activity was investigated by photocatalytic removal of gas-phase Hg0. The results indicate that they exhibit different photocatalytic properties in the order of Bi4O5I2/Bi5O7I > BiOI/Bi4O5I2 > Bi4O5I2 > Bi5O7I > BiOI, which is related to their visible light absorption, specific surface area, energy band structure and charge separation efficiency. In addition, the reasonable charge migration mechanism and the photocatalytic reaction mechanism for gas-phase Hg0 removal were proposed.

中文翻译：

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原位自模板相变和异质结构构建可控设计碘氧化铋光催化去除气相汞

摘要 在这项工作中，以BiOI为自牺牲模板，通过原位相变和异质结构构建，通过简单的煅烧方法制备了各种碘氧化铋，包括BiOI/Bi4O5I2异质结、Bi4O5I2、Bi4O5I2/Bi5O7I异质结和Bi5O7I。通过一系列表征分析了在不同煅烧温度下合成的样品的理化性质。通过光催化去除气相Hg0来研究光催化活性。结果表明，它们表现出不同的光催化性能，顺序为 Bi4O5I2/Bi5O7I > BiOI/Bi4O5I2 > Bi4O5I2 > Bi5O7I > BiOI，这与它们的可见光吸收、比表面积、能带结构和电荷分离效率有关。此外，