Qaraah Fahim A, Mahyoub Samah A, Hafez Mahmoud Elsayed, Xiu Guangli
State Environmental Protection Key Lab of Environmental Risk Assessment and Control on Chemical Processes, School of Resources & Environmental Engineering, East China University of Science and Technology Shanghai 200237 China
Department of Chemistry, Faculty of Science, Beni-Suef University Beni-Suef 62511 Egypt
RSC Adv. 2019 Dec 2;9(68):39561-39571. doi: 10.1039/c9ra07505d.
Herein, we fabricated a C and N co-modified NbO nanonet structure (C-N/NbONNs) from niobium oxalate using 2-methylimidazole (Hmim) as a source for C and N a simple hydrothermal route. The obtained nanonets are robust and cost-effective with excellent recycling stability. Compared with N-doped TiO (N-TiO) and a NbO control sample (NbO-CS), the resulting nanonets exhibited the highest performance toward the photocatalytic degradation of Rhodamine B (RhB) upon visible light irradiation ( > 420 nm). Through this study, we revealed that the synergetic effects of C and N on the nanonet surface, which were effectively incorporated into the surface of the NbO nanonet structure, not only remarkably enhanced the visible light response by decreasing the bandgap to 2.9 eV but also improved the light utilization efficiency and photo-induced electron-hole pair separation efficiency of our nanonet structure. We also proposed that the presence of carbonate species (CO ) and nitrogen species (NO ) increased the population of generated holes (h) that had the key role in the photodegradation mechanism of RhB, suggesting reasonable importance for the modification of NbO with C and N. This synergism offers a new view to reveal the origin of photodegradation processes, introducing h as a key intermediate. Our approach provides a new insight to design 2D nanostructures with potential applications in catalysis, solar energy conversion, and environmental protection.
在此，我们通过简单的水热路线，以草酸铌为原料，使用2-甲基咪唑（Hmim）作为碳和氮的来源，制备了一种碳氮共修饰的氧化铌纳米网结构（C-N/NbONNs）。所获得的纳米网结构坚固且具有成本效益，具有出色的循环稳定性。与氮掺杂的二氧化钛（N-TiO）和氧化铌对照样品（NbO-CS）相比，所得纳米网在可见光照射（>420 nm）下对罗丹明B（RhB）的光催化降解表现出最高性能。通过这项研究，我们揭示了碳和氮在纳米网表面的协同效应，它们有效地掺入到氧化铌纳米网结构的表面，不仅通过将带隙降低到2.9 eV显著增强了可见光响应，还提高了我们纳米网结构的光利用效率和光生电子-空穴对分离效率。我们还提出，碳酸根物种（CO ）和氮物种（NO ）的存在增加了在RhB光降解机制中起关键作用的空穴（h）的数量，这表明碳和氮对氧化铌的修饰具有合理的重要性。这种协同作用为揭示光降解过程的起源提供了新的视角，引入h作为关键中间体。我们的方法为设计在催化、太阳能转换和环境保护等方面具有潜在应用的二维纳米结构提供了新的见解。
