Efficient enrichment of targeted gaseous pollutants and fast diffusion rates of charge carriers are essential for the photocatalytic removal of nitric oxides at ambient concentration levels. Here we demonstrate that the construction of nano-structured Bi₂O₃/Bi₂O₂CO₃ heterojunctions with oxygen vacancies, increasing the photocatalytic NO removal activity, durability and selectivity for final products nitrate formation. Combining the experimental and density-functional theory calculations, it was elucidated that the presence of surface oxygen vacancies not only work as adsorption sites of low concentration NO, but also offer an intimate and integrated structure between surface defects and the light-harvesting heterojunctions, which can facilitate solar energy conversion and charge carrier transfer (more than 2 times). Control experiments with pristine Bi₂O₃/Bi₂O₂CO₃ also confirmed the crucial role of surface oxygen vacancies on the improvement of NO adsorption and removal ability during the photocatalytic degradation process. We explain the enhanced removal of NO through the synergistic effect of oxygen vacancy and heterojunction, which not only guaranteed the generation of more OH radicals, but also provided another route to produce hydrogen peroxide. Our findings may provide an opportunity to develop a promising catalyst for air pollution control.

有效富集目标气态污染物和电荷载体的快速扩散速率对于在环境浓度水平下光催化去除一氧化氮至关重要。在这里，我们证明了纳米结构的Bi ₂ O ₃ / Bi ₂ O ₂ CO ₃的构造带有氧空位的异质结，增加了光催化去除NO的活性，耐久性和最终产物硝酸盐形成的选择性。结合实验和密度泛函理论计算，阐明了表面氧空位的存在不仅充当低浓度NO的吸附位，而且还提供了表面缺陷与集光异质结之间的紧密而完整的结构，从而可以促进太阳能转换和电荷载流子传输（超过2倍）。原始Bi ₂ O ₃ / Bi ₂ O ₂ CO _3的对照实验还证实了表面氧空位在光催化降解过程中对提高NO吸附和去除能力的关键作用。我们解释了通过氧空位和异质结的协同作用增强了NO的去除，这不仅保证了更多OH自由基的产生，而且还提供了另一种生产过氧化氢的途径。我们的发现可能为开发有希望的空气污染控制催化剂提供机会。