The S-scheme heterojunction has emerged as a novel structure with significant potential for advanced wastewater treatment, primarily due to its efficient utilization of photo-generated carriers. In this study, an S-scheme heterojunction was synthesized by combining Aurivillius oxides (Co₂MoOₓ) with TiO₂ for the photocatalytic degradation of tetracycline antibiotics. The Co₂MoOₓ/TiO₂ heterojunction exhibited a superior photocatalytic removal rate of chlortetracycline, achieving 97% degradation within 60 min, compared to only 60% with pure TiO₂. The introduction of Co₂MoOₓ facilitated the formation of an internal electric field (IEF) due to its lower work function relative to pure TiO₂. According to in-situ XPS, UPS and KPFM techniques, electrons will transfer from TiO₂ to Co₂MoO_x after continuous irradiation, which could effectively promote the separation efficiency and enhance the carriers density to participate the photodegradation process.

中文翻译：

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通过Aurivillius氧化物和TiO2的组合合理设计S型结构，以高效去除四环素类抗生素


S 型异质结已成为一种新型结构，在高级废水处理方面具有巨大潜力，这主要是由于其对光生载体的高效利用。本研究通过将 Aurivillius 氧化物 （Co₂MoOₓ） 与 TiO₂ 结合合成了 S 型异质结，用于光催化降解四环素类抗生素。Co₂MoOₓ/TiO₂ 异质结表现出优异的金霉素光催化去除率，在 60 分钟内实现 97% 的降解，而纯 TiO₂ 的降解率仅为 60%。Co₂MoOₓ 的引入促进了内部电场 （IEF） 的形成，因为它相对于纯 TiO₂ 的功函数较低。根据原位 XPS、UPS 和 KPFM 技术，电子在连续照射后将从 TiO₂ 转移到 Co₂MoO_x，可以有效提高分离效率并提高载流子密度以参与光降解过程。