Liao Runhua, Han Jing, Chen Zhongyan, Wang Jing, Wu Haoyue, Huang Shuangqiu, Yan Cheng, Wang Zhu
School of Materials Science and Engineering, Jingdezhen Ceramic University Jingdezhen 333403 Jiangxi China.
Institute of Environmental Research at Greater Bay/Key Laboratory for Clean Energy and Materials/Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University Guangzhou 510006 China
RSC Adv. 2022 Oct 7;12(44):28629-28636. doi: 10.1039/d2ra04900g. eCollection 2022 Oct 4.
Heteroatom doping has proved to be one of the most effective approaches to further improve the photocatalytic activities of semiconducting oxides originating from the modulation of their electronic structures. Herein, nitrogen-doped SnO nanorods were synthesized facile solvothermal processes using polyvinylpyrrolidone (PVP) as a dispersing agent and ammonium water as the N source, respectively. Compared with pure SnO sample, the as-synthesized nitrogen-doped SnO nanorods demonstrated enhanced photocatalytic performances, evaluated by the degradation of rhodamine B (RhB), revealing the effectiveness of nitrogen doping towards photocatalysis. In particular, the optimal photocatalyst (using 0.6 g PVP and 1 mL ammonia water) could achieve up to 86.23% pollutant removal efficiency under ultraviolet (UV) light irradiation within 150 min, showing 17.78% higher efficiency than pure SnO. Detailed structural and spectroscopic characterization reveals the origin of activity enhancement of nitrogen-doping SnO in contrast with pure SnO. Specifically, the bandgap and the morphologies of nitrogen-doped SnO have changed with more chemisorbed sites, which is supposed to result in the enhancement of photocatalytic efficiency. Moreover, the possible formation mechanism of nitrogen-doped SnO nanorods was discussed, in which PVP played a crucial role as the structure orientator.
杂原子掺杂已被证明是进一步提高半导体氧化物光催化活性的最有效方法之一，这源于其电子结构的调制。在此，分别以聚乙烯吡咯烷酮（PVP）为分散剂、氨水为氮源，通过简便的溶剂热法合成了氮掺杂的SnO纳米棒。与纯SnO样品相比，通过罗丹明B（RhB）降解评估，所合成的氮掺杂SnO纳米棒表现出增强的光催化性能，揭示了氮掺杂对光催化的有效性。特别是，最佳光催化剂（使用0.6 g PVP和1 mL氨水）在紫外（UV）光照射下150分钟内可实现高达86.23%的污染物去除效率，比纯SnO高出17.78%。详细的结构和光谱表征揭示了与纯SnO相比氮掺杂SnO活性增强的原因。具体而言，氮掺杂SnO的带隙和形态发生了变化，具有更多化学吸附位点，这被认为导致了光催化效率的提高。此外，还讨论了氮掺杂SnO纳米棒可能的形成机制，其中PVP作为结构导向剂起到了关键作用。
