The Synergistic Effect of Pyridinic Nitrogen and Graphitic Nitrogen of Nitrogen-Doped Graphene Quantum Dots for Enhanced TiO2 Nanocomposites' Photocatalytic Performance
The Synergistic Effect of Pyridinic Nitrogen and Graphitic Nitrogen of Nitrogen-Doped Graphene Quantum Dots for Enhanced TiO2 Nanocomposites' Photocatalytic Performance
复制标题
氮掺杂石墨烯量子点中吡啶氮和石墨氮的协同作用增强TiO2纳米复合材料的光催化性能
DOI：
10.3390/catal8100438
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发表时间：
2018-10-01
期刊：
影响因子：
3.9
通讯作者：
Wang, Liang
中科院分区：
文献类型：
--
作者：
Li, Fei;Li, Ming;Wang, Liang
在这项研究中，氮掺杂的石墨烯量子点（N-GQD）和二氧化钛纳米复合材料的合成使用一个简单的水热路线。使用氨水作为氮源来制备N-GQD。当通过UV-vis进行光学表征时，N-GQD在紫外（UV）光范围内显示出比石墨烯量子点（GQD）更强的吸收峰。与GQDs/TiO 2和纯TiO 2相比，N-GQDs/TiO 2的光催化性能有显著提高。当氨水加入量为50 mL时，吡啶态氮和石墨态氮的含量分别高达22.47%和31.44%。最重要的是，N-GQDs/TiO 2 -50的光催化活性在12 min后约为95%。结果表明，吡啶N和石墨N在光催化性能中起着重要作用。
In this study, nitrogen-doped graphene quantum dots (N-GQDs) and a TiO2 nanocomposite were synthesized using a simple hydrothermal route. Ammonia water was used as a nitrogen source to prepare the N-GQDs. When optically characterized by UV-vis, N-GQDs reveal stronger absorption peaks in the range of ultraviolet (UV) light than graphene quantum dots (GQDs). In comparison with GQDs/TiO2 and pure TiO2, the N-GQDs/TiO2 have significantly improved photocatalytic performance. In particular, it was found that, when the added amount of ammonia water was 50 mL, the content of pyridinic N and graphitic N were as high as 22.47% and 31.44%, respectively. Most important, the photocatalytic activity of N-GQDs/TiO2-50 was about 95% after 12 min. The results illustrated that pyridinic N and graphitic N play a significant role in photocatalytic performance.