One-dimensional Bi₂O₃–Bi₅O₇I heterostructures with enhanced visible light photocatalytic performance were synthesized by high temperature calcination of BiOI–Bi(OHC₂O₄)·2H₂O precursors. The Bi₅O₇I nanosheets uniformly grew on the Bi₂O₃ porous rods. The photocatalytic performance of the obtained products was evaluated by degradation of methyl orange (MO) and phenol under visible light irradiation. The results show that the Bi₂O₃–Bi₅O₇I heterostructure displays higher photocatalytic activity than pure phase Bi₂O₃ and Bi₅O₇I, and MO and phenol with high concentration can be completely degraded in 60 min under visible light irradiation using the Bi₂O₃–Bi₅O₇I (DS-2) heterostructure as a photocatalyst. This enhanced photocatalytic performance is ascribed to the synergistic effect of the suitable band alignment of Bi₂O₃ and Bi₅O₇I, high interface quality and one-dimensionally ordered nanostructure. Radical scavenger experiments indicate that holes (h⁺) and superoxide radicals (˙O₂⁻) were the main active species for MO and phenol degradation during the photocatalytic process. This work will offer a simple route to design and synthesize junction structures with high interface quality for photocatalytic applications.

中文翻译：

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具有高界面质量 的一维Bi ₂ O ₃ –Bi ₅ O ₇ I异质结的合成†

通过高温煅烧BiOI-Bi（OHC ₂ O ₄）·2H ₂ O前驱体，合成了具有增强可见光光催化性能的一维Bi ₂ O ₃ -Bi ₅ O ₇ I异质结构。Bi ₅ O ₇ I纳米片在Bi ₂ O ₃多孔棒上均匀生长。通过在可见光照射下甲基橙（MO）和苯酚的降解来评估所得产物的光催化性能。结果表明，Bi ₂ O ₃ –Bi ₅ O ₇I异质结构显示出比纯相Bi ₂ O ₃和Bi ₅ O ₇ I更高的光催化活性，并且使用Bi ₂ O ₃ –Bi ₅ O ₇ I在可见光照射下60分钟内高浓度的MO和苯酚可以完全降解。（DS-2）异质结构作为光催化剂。这种增强的光催化性能归因于Bi ₂ O ₃和Bi ₅ O ₇ I的合适能带排列，高界面质量和一维有序纳米结构的协同效应。自由基清除剂实验表明，空穴（h ⁺）和超氧自由基（O ₂ ^- ）是在光催化过程用于MO和苯酚降解的主要活性物质。这项工作将为设计和合成用于光催化应用的具有高界面质量的结结构提供一条简单的途径。