A Ce doped SnO₂ (Ce-SnO₂) photocatalyst was constructed under the argon atmosphere with abundant oxygen vacancies (OVs) for adsorption and activation of NO and O₂, aiming to promote NO deep oxidation removal efficiency under different relative humidity. It was found that the incorporation of cerium ions into SnO₂ could results in the generation of OVs under argon atmospheres, which further promoted NO deep oxidation under visible light irradiation. The theoretical calculations results and in-situ DRIFTS demonstrated that NO was actively adsorbed at OVs sites to form the NO⁻ intermediate and finally transformed to the harmless nitrate and nitrite products by the activated reactive oxygen species (ROS) at OVs sites. This process could occur continuously since more OVs were formed under visible light irradiation. This study maybe provides a new approach to design and synthesize high-efficient photocatalysts for NO removal.

在氩气气氛下构建了具有高氧空位（OVs）的Ce掺杂SnO ₂（Ce-SnO ₂）光催化剂，用于NO和O _2的吸附和活化，旨在提高不同相对湿度下NO的深度氧化去除效率。发现将铈离子掺入SnO _2中可导致在氩气氛下产生OV，这进一步促进了可见光照射下NO的深氧化。理论计算结果和原位漫反射红外光谱表明，NO积极吸附在OVS部位形成NO ^-中间体，最后通过OVs处的活性氧（ROS）转化为无害的硝酸盐和亚硝酸盐产品。由于在可见光照射下会形成更多的OV，因此该过程可以连续发生。这项研究可能为设计和合成用于去除NO的高效光催化剂提供了一种新方法。