College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, China.
Nantong Vocational University, Nantong, 226007, China.
Sci Rep. 2021 Nov 25;11(1):22950. doi: 10.1038/s41598-021-02161-x.
In this study, graphitic carbon nitride (g-CN) and niobium pentoxide nanofibers (NbO NFs) heterojunction was prepared by means of a direct electrospinning approach combined with calcination process. The characterizations confirmed a well-defined morphology of the g-CN/NbO heterojunction in which NbO NFs were tightly attached onto g-CN nanosheets. Compared to pure g-CN and NbO NFs, the as-prepared g-CN/NbO heterojunction exhibited remarkably enhanced photocatalytic activity for degradation of rhodamine B and phenol under visible light irradiation. The enhanced catalytic activity was attributed predominantly to the synergistic effect between g-CN sheets and NbO NFs, which promoted the transferring of carriers and prohibited their recombination, confirmed by the measurement of transient photocurrent responses and photoluminescence spectra. In addition, the active species trapping experiments indicated that superoxide radical anion (·O) and hole (h) were the major active species contributing to the photocatalytic process. With its high efficacy and ease of preparation, g-CN/NbO heterojunction has great potentials for applications in treatment of organic pollutants and conversion of solar energy.
在这项研究中，通过直接静电纺丝方法结合煅烧过程制备了石墨相氮化碳（g-CN）和五氧化二铌纳米纤维（NbO NFs）异质结。表征结果证实了 g-CN/NbO 异质结具有良好的形态，其中 NbO NFs 紧密附着在 g-CN 纳米片上。与纯 g-CN 和 NbO NFs 相比，所制备的 g-CN/NbO 异质结在可见光照射下对罗丹明 B 和苯酚的降解表现出显著增强的光催化活性。增强的催化活性主要归因于 g-CN 片和 NbO NFs 之间的协同效应，这促进了载流子的转移并阻止了它们的复合，这可以通过瞬态光电流响应和光致发光光谱的测量来证实。此外，活性物质捕获实验表明，超氧自由基阴离子（·O）和空穴（h）是光催化过程中的主要活性物质。g-CN/NbO 异质结具有高效和易于制备的特点，在处理有机污染物和太阳能转化方面具有巨大的应用潜力。
