Plasmonic bismuth (Bi⁰) nanoparticle-decorated flower-like CeO_2−δ (Bi⁰/CeO_2−δ) photocatalysts with abundant oxygen vacancies (OVs) were synthesized via a solvothermal method. The OVs can not only improve the separation of electron-hole pairs, but also facilitate the adsorption and activation of gas molecules (NO/O₂). In addition, the Bi⁰ nanoparticles can enhance the visible light response and prevent the recombination of charge carriers by virtue of the surface plasmon resonance (SPR) effect, achieving an excellent ability for NO elimination and NO₂ inhibition under visible light irradiation. Density functional theory (DFT) calculations confirm that the Schottky barrier between Bi⁰ and CeO_2−δ accompanied with the OVs are pivotal for the migration of photogenerated charge carriers to involve in the photocatalytic NO removal. Trapping experiments and in situ FTIR spectroscopy were conducted to explore the mechanism of the photocatalytic NO removal, suggesting that the photocatalytic NO removal can be significantly enhanced by introducing abundant OVs and the involvement of Bi⁰ metal nanoparticles.

通过溶剂热法合成了等离子铋（Bi ⁰）纳米粒子修饰的花状CeO _2-δ（Bi ⁰ / CeO _2-δ）光催化剂，并具有大量的氧空位（OVs）。OVs不仅可以改善电子-空穴对的分离，还可以促进气体分子（NO / O ₂）的吸附和活化。此外，Bi ⁰纳米颗粒可通过表面等离振子共振（SPR）效应增强可见光响应并防止电荷载流子重新结合，从而具有出色的NO消除和NO ₂能力。可见光照射下的抑制。密度泛函理论（DFT）计算证实，Bi ⁰和CeO _2−δ之间的肖特基势垒与OV结合对于光生电荷载流子的迁移以参与光催化NO的去除至关重要。进行了诱捕实验和原位FTIR光谱研究了光催化脱氮的机理，表明通过引入大量的OV和Bi ⁰金属纳米粒子的参与可以显着提高光催化脱氮的能力。