Enhancing adsorption ability of photocatalyst by vacancy is a fascinating strategy. Thus, Bi₂WO₆/BiOCl with millefeuille-like was successfully prepared via multi-pots method. Experimental results discern that BOW-10 can degraded 75.19% doxycycline hydrochloride (DOC, 20 mg/L) in 1 h, which is 1.3 and 3.5-fold larger than Bi₂WO₆ and BiOCl, respectively. The mechanism revealed that OVs (oxygen vacancies) not only promote the adsorption of DOC and O₂ but also augment the activation ability of molecular oxygen. Therefore, photo-induced electrons can rapidly transfer from BiOCl to Bi₂WO₆ via carrier transport channels formed by interface oxygen vacancies (IOVs) under interfacial electric field (IEF) to reduce the adsorbed O₂. Finally, DOC was eliminated by O₂˙^- and h⁺. Moreover, the relationship of surface areas, OVs concentration and the separation efficiency of photo-generated carriers was constructed. Meanwhile, the degradation paths of DOC and the toxicity of the intermediates were comprehensively investigated through DFT theoretical calculation. This research provides an innovation approach to regulate the capability of pollution adsorption and molecular oxygen activation by vacancy engineering and heterostructure engineering.

中文翻译：

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氧空位提高 Bi2WO6/BiOCl 的吸附和纯化性能


通过空位增强光催化剂的吸附能力是一种令人着迷的策略。因此，通过多罐法成功制备了具有千层酥样的 Bi₂WO₆/BiOCl。实验结果表明，BOW-10 可在 1 h 内降解 75.19% 的盐酸多西环素 （DOC， 20 mg/L），分别是 Bi₂WO₆ 和 BiOCl 的 1.3 倍和 3.5 倍。该机制揭示了 OVs（氧空位）不仅促进 DOC 和 O₂ 的吸附，还增强了分子氧的活化能力。因此，光生电子可以在界面电场 （IEF） 下通过界面氧空位 （IOV） 形成的载流子传输通道从 BiOCl 快速转移到 Bi₂WO₆ 中，以减少吸附的 O₂。最后，DOC 被 O₂ ̇^- 和 h⁺ 消除。此外，构建了表面积、OVs 浓度和光生载流子分离效率的关系。同时，通过 DFT 理论计算全面研究了 DOC 的降解路径和中间体的毒性。本研究提供了一种通过空位工程和异质结构工程调控污染吸附和分子氧活化能力的创新方法。