Band structure and component content are the key factors for determining the activity of semiconductor heterojunction. In this study, a novel Bi₅O₇I/BiOBr_xI_1−x heterostructure was synthesized by a simple hydrobromic (HBr) acid etching method through transforming partial of Bi₅O₇I to I⁻ ion doped BiOBr (BiOBr_xI_1−x) at room temperature without adding extra dopant. Both the band structure and component content of Bi₅O₇I/BiOBr_xI_1−x alter with the additive HBr acid. The Bi₅O₇I/BiOBr_xI_1−x (S3.0) sample exhibits the best photocatalytic activity, 6 times higher than that of pure Bi₅O₇I, for the degradation of methyl orange under visible-light (λ > 420 nm). The activity enhancement of Bi₅O₇I/BiOBr_xI_1−x is primarily ascribed to the improved separation efficiency of photocharges, originated from the adjustable band structure and component content. The significant findings of this paper provide a facile way to construct highly efficient semiconductor heterojunction via playing the synergetic effect of adjustable band structure and component content for purifying organic pollutants in wastewater.

能带结构和组分含量是决定半导体异质结活性的关键因素。在这项研究中，_通过将部分 Bi ₅ O ₇ I_转化为I ^-离子掺杂的_{BiOBr (} BiOBr _x I _{1− x} ) 在室温下不添加额外的掺杂剂。_{Bi 5} O ₇ I/BiOBr _x I _{1− x}的能带结构和组分含量用添加剂 HBr 酸改变。Bi ₅ O ₇ I/BiOBr _x I _{1− x} (S3.0) 样品表现出最好的光催化活性，比纯 Bi ₅ O ₇ I 高 6 倍，用于在可见光下降解甲基橙 ( λ  > 420 纳米）。_{Bi 5} O ₇ I/BiOBr _x I _{1− x}活性增强主要归因于光电荷分离效率的提高，源于可调节的能带结构和组分含量。该论文的重要发现为通过调节能带结构和组分含量的协同作用构建高效半导体异质结净化废水中的有机污染物提供了一种简便的方法。