The modification of semiconductors with multi-strategies is an effective and promising way to boost the visible light induced photocatalytic performance of photocatalysts. Herein, we report an effective strategy to boost the visible light photocatalytic activity of an ultrathin Bi₂O₂(OH)_xCl_2−x solid solution with an exposed {001} facet by adjusting the concentrations of oxygen vacancies and OH in it. The ultrathin Bi₂O₂(OH)_xCl_2−x was synthesized by replacing Cl in BiOCl with OH and the oxygen vacancy was induced by using EG as part of the solvothermal reaction solution. The thickness of the nanosheet and content of OH in the solid solution could be controlled by simply adjusting the pH value of the reaction solution. The Bi₂O₂(OH)_xCl_2−x solid solution with an oxygen vacancy and a suitable OH replacement presented a superior visible light photocatalytic activity for the degradation of antibiotics, which was ca. 4 and 2 times higher than those of BiOCl and Bi₂O₂(OH)Cl, respectively, both with oxygen vacancy modification. This outstanding performance was owing to the enhancement of visible light absorption, molecular oxygen motivation and charge carrier separation by the co-effect of oxygen vacancy and OH replacement, revealed by a photoelectrochemical test and charge density difference simulation, etc. This work might provide a new promising strategy to motivate the visible light photocatalytic performance of photocatalysts.

中文翻译：

---

通过氧空位和OH置换的共同作用来 激发具有暴露的{001}面的超薄Bi ₂ O ₂（OH）_x Cl _{2− x}固溶体的可见光光催化活性†

用多种策略对半导体进行改性是提高可见光诱导的光催化剂光催化性能的有效途径。本文中，我们报告了一种有效的策略，可以通过调节其中的氧空位和OH的浓度来提高具有暴露的{001}面的超薄Bi ₂ O ₂（OH）_x Cl _{2− x}固溶体的可见光光催化活性。超薄Bi ₂ O ₂（OH）_x Cl _{2− x}通过用OH取代BiOCl中的Cl合成氯，并通过使用EG作为溶剂热反应溶液的一部分诱导氧空位。可以通过简单地调节反应溶液的pH值来控制纳米片的厚度和固溶体中OH的含量。具有氧空位和合适的OH替代物的Bi ₂ O ₂（OH）_x Cl _{2− x}固溶体显示出优异的可见光光催化活性，可降解抗生素，约为。比BiOCl和Bi ₂ O ₂高4到2倍（OH）Cl分别具有氧空位修饰。这种出色的性能归因于通过氧空位和OH置换的共同作用增强了可见光吸收，分子氧动机和电荷载流子分离，通过光电化学测试和电荷密度差模拟等揭示了这一点。这项工作可能会提供一种新的有希望的策略来激发光催化剂的可见光光催化性能。