Yan Dandan, Wei Tingting, Fang Wencheng, Jin Zhanbin, Li Fengyan, Xia Zhinan, Xu Lin
Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University Changchun Jilin 130024 P. R. China
RSC Adv. 2020 Sep 3;10(54):32662-32670. doi: 10.1039/d0ra01056a. eCollection 2020 Sep 1.
Recently, TaON has become a promising photoelectrode material in the photocatalytic field owing to its suitable band gap and superior charge carrier transfer ability. In this work, we prepared a TaON/CdS photocatalytic film using a CdS nanoparticle-modified TaON film by the successive ionic layer adsorption and reaction (SILAR) method. For the first time, the ZnS nanoparticles were deposited on the TaON/CdS film using the same method. We found that pure TaON had a nanoporous morphology, thus resulting in high specific surface area and better gas adsorption capacity. Furthermore, the TaON/CdS/ZnS film displayed a highly efficient NO photodegradation rate under visible light irradiation owing to its stronger visible light response, photocorrosion preventive capacity, and the high separation efficiency of photo-induced electrons and holes. Interestingly, the promising TaON/CdS/ZnS film also possessed remarkable recyclability for NO degradation. Therefore, we suggest that the TaON/CdS/ZnS photocatalytic film might be used for the photocatalytic degradation of other pollutants or in other applications. We also put forward the feasible NO photocatalytic degradation mechanism for the TaON/CdS/ZnS film. From the schematic diagram, we could further obtain the photo-generated carrier transport process and NO photodegradation principle in detail over the ternary photocatalytic film. Moreover, the trapping experiment demonstrates that ·O and h all play significant roles in NO degradation under visible light irradiation.
最近，由于具有合适的带隙和优异的电荷载流子转移能力，TaON已成为光催化领域中一种很有前景的光电极材料。在本工作中，我们通过连续离子层吸附和反应（SILAR）法，使用CdS纳米颗粒修饰的TaON薄膜制备了TaON/CdS光催化薄膜。首次使用相同方法将ZnS纳米颗粒沉积在TaON/CdS薄膜上。我们发现纯TaON具有纳米多孔形态，因此具有高比表面积和更好的气体吸附能力。此外，TaON/CdS/ZnS薄膜由于其更强的可见光响应、光腐蚀预防能力以及光生电子和空穴的高分离效率，在可见光照射下显示出高效的NO光降解速率。有趣的是，有前景的TaON/CdS/ZnS薄膜在NO降解方面也具有显著的可回收性。因此，我们认为TaON/CdS/ZnS光催化薄膜可用于其他污染物的光催化降解或其他应用。我们还提出了TaON/CdS/ZnS薄膜可行的NO光催化降解机理。从示意图中，我们可以进一步详细获得三元光催化薄膜上光生载流子的传输过程和NO光降解原理。此外，俘获实验表明·O和h在可见光照射下的NO降解中都起着重要作用。
