Photocatalytic oxidation is a green and energy-saving technology for removing the low concentration NO in ambient atmosphere. High efficient and stable photocatalysts are essential for achieving excellent NO conversion effect. In this work, oxygen vacancy-rich Nb₂O₅/Nb₂C heterojunction photocatalysts were prepared from Nb₂C MXene by hydrothermal process and heat treatment in H₂/Ar. The (001) facet-dominant Nb₂O₅ nanorods in-situ grown on Nb₂C MXene formed an actiniae-like structure, which promotes the active site exposure and enlarges the reaction interface. Under visible light, the optimized photocatalyst exhibits excellent NO removal rates in the relative humidity range of 25–75%. Mechanism research shows that the oxygen vacancies greatly improve the photocatalytic NO oxidation capacity. Oxygen vacancies on (001) facet of Nb₂O₅ nanorods can boost the visible light absorption, effectively adsorb and activate the reactant gas. The separation of photogenerated carriers was synergistically enhanced by the oxygen vacancies and Nb₂O₅/Nb₂C heterojunction.

光催化氧化是一种去除环境大气中低浓度NO的绿色节能技术。高效稳定的光催化剂对于实现优异的 NO 转化效果至关重要。在这项工作中，以Nb ₂ C MXene为原料，通过水热法和H ₂ /Ar中热处理制备了富氧空位Nb ₂ O ₅ /Nb ₂ C异质结光催化剂。在 Nb ₂上原位生长的 (001) 面主导 Nb ₂ O ₅纳米棒C MXene形成了类actiniae结构，促进了活性位点的暴露并扩大了反应界面。在可见光下，优化后的光催化剂在 25-75% 的相对湿度范围内表现出优异的 NO 去除率。机理研究表明，氧空位极大地提高了光催化NO氧化能力。Nb ₂ O ₅纳米棒(001)面上的氧空位可以增强可见光吸收，有效吸附和活化反应气体。氧空位和Nb ₂ O ₅ /Nb ₂ C异质结协同增强了光生载流子的分离。