The wide band gap of TiO₂ photocatalyst material limits its application in the field of visible photocatalysis. In this paper, oxygen vacancies and carbon quantum dots (CQD) with up-conversion character were proposed to improve the photocatalytic activity for NO removal of TiO₂ under visible light irradiation. The one-dimensional TiO₂ nanotube (TNs), TNs containing oxygen vacancies (OVTNs), TNs of composite CQD (CQD-TNs) and OVTNs of composite CQD (CQD-OVTNs) were prepared, respectively. Furthermore, the influence of oxygen vacancies and CQD on the removal of NOx by photocatalysis were explored. It is found that CQD-OVTNs exhibits the conspicuous synergetic effect of CQD and oxygen vacancy to boost visible photocatalytic NO removal, the NO removal efficiency was about 12, 2, and 2.6 times to TNs, OVTNs and CQD-TNs. Also, CQD-OVTNs exhibits the NO₂-inhibited property during the process of photocatalytic NO removal. Finally, the synergetic mechanism of CQD and oxygen vacancies to TNs for boosting visible photocatalytic NO removal was revealed.

_{TiO 2}光催化剂材料的宽带隙限制了其在可见光催化领域的应用。在本文中，提出了具有上转换特性的氧空位和碳量子点 (CQD)，以提高可见光照射下TiO _{2去除 NO 的光催化活性。}一维TiO ₂分别制备了纳米管（TNs）、含氧空位的TNs（OVTNs）、复合CQD的TNs（CQD-TNs）和复合CQD的OVTNs（CQD-OVTNs）。此外，还探讨了氧空位和 CQD 对光催化去除 NOx 的影响。结果表明，CQD-OVTNs 表现出 CQD 和氧空位显着的协同作用，促进可见光催化 NO 去除，NO 去除效率分别是 TNs、OVTNs 和 CQD-TNs 的 12、2 和 2.6 倍。此外，CQD-OVTNs在光催化去除 NO 的过程中表现出抑制 NO _{2的特性。}最后，揭示了 CQD 和氧空位对 TNs 促进可见光催化 NO 去除的协同机制。