It is essential to promote interfacial separation and charge migration in heterojunctions for effectively driving surface photocatalytic reactions. In this work, we report the construction of a 2D/2D layered BiOIO/g-CN (BIO/CN) heterojunction for photocatalytic NO removal. The BIO/CN heterojunction exhibits a remarkably higher NO photo-oxidation removal rate (46.9%) compared to pristine BIO (20.1%) and CN (25.9%) under visible-light irradiation. Additionally, it effectively suppresses the formation of toxic NO intermediates during photocatalytic reaction. The improved photocatalytic performance of BIO/CN composite is caused by its S-scheme charge carrier transport mechanism, which is supported by Density Functional Theory simulations of work function and electron density difference, along with irradiated X-ray Photoelectron Spectroscopy and Electron Paramagnetic Resonance analyses. This S-scheme structure improves the interfacial carrier separation efficiency and retains the strong photo-redox ability. Our study demonstrates that construction of a S-scheme heterojunction is significant in the design and preparation of highly efficient photocatalysts for air purification.

中文翻译：

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用于光催化NO氧化的2D/2D层状BiOIO3/g-C3N4 S型异质结

促进异质结中的界面分离和电荷迁移对于有效驱动表面光催化反应至关重要。在这项工作中，我们报告了用于光催化 NO 去除的 2D/2D 层状 BiOIO/g-CN (BIO/CN) 异质结的构建。在可见光照射下，与原始BIO（20.1％）和CN（25.9％）相比，BIO / CN异质结表现出明显更高的NO光氧化去除率（46.9％）。此外，它还能有效抑制光催化反应过程中有毒NO中间体的形成。 BIO/CN复合材料光催化性能的提高是由其S型载流子传输机制引起的，这一机制得到了功函数和电子密度差的密度泛函理论模拟以及辐照X射线光电子能谱和电子顺磁共振分析的支持。这种S型结构提高了界面载流子分离效率并保留了较强的光氧化还原能力。我们的研究表明，S 型异质结的构建对于设计和制备用于空气净化的高效光催化剂具有重要意义。