College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China.
College of Civil Engineering and Architecture, Hebei University, Baoding 071002, China; Technology Innovation Center for Testing and Evaluation in Civil Engineering of Hebei Province, Baoding 071002, China.
J Hazard Mater. 2023 Jun 15;452:131237. doi: 10.1016/j.jhazmat.2023.131237. Epub 2023 Mar 17.
The wide band gap of TiO 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 TiO under visible light irradiation. The one-dimensional TiO 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 NO-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 光催化剂材料的宽带隙限制了其在可见光光催化领域的应用。本文提出了氧空位和具有上转换特性的碳量子点（CQD），以提高 TiO 在可见光照射下去除 NO 的光催化活性。分别制备了一维 TiO 纳米管（TNs）、含有氧空位的 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 和氧空位的协同作用，显著提高了可见光光催化去除 NO 的效率，其去除效率约为 TNs、OVTNs 和 CQD-TNs 的 12、2 和 2.6 倍。此外，CQD-OVTNs 在光催化去除 NO 的过程中表现出了对 NO 的抑制性。最后，揭示了 CQD 和氧空位协同作用提高 TNs 可见光光催化去除 NO 的机制。
