Photocatalytic, Fenton and photo-Fenton degradation of RhB over Z-scheme g-C3N4/LaFeO3 heterojunction photocatalysts
Photocatalytic, Fenton and photo-Fenton degradation of RhB over Z-scheme g-C3N4/LaFeO3 heterojunction photocatalysts
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Z 型 g-C3N4/LaFeO3 异质结光催化剂上光催化、芬顿和光芬顿降解 RhB
DOI：
10.1016/j.mssp.2018.03.033
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发表时间：
2018-08
影响因子：
4.1
通讯作者：
Feng Wangjun
中科院分区：
文献类型：
--
作者：
Ye Yongchun;Yang Hua;Wang Xiangxian;Feng Wangjun
将均匀混合的g-C3N4纳米片和LaFeO3纳米颗粒在300℃下煅烧1h制备了Z型g-C3N4/LaFeO3异质结光催化剂。通过 XRD、SEM、TEM、XPS、UV-vis DRS、PL 光谱、EIS 和光电流响应系统地表征了所制备的 g-C3N4/LaFeO3 复合材料。结果表明，LaFeO3纳米粒子（平均尺寸：约35nm）通过化学键合均匀地组装到g-C3N4纳米片的表面，从而形成g-C3N4/LaFeO3异质结。通过使用模拟太阳光作为光源降解 RhB 来研究样品的光催化、Fenton 和光 Fenton 性能。与裸LaFeO3和g-C3N4相比，g-C3N4/LaFeO3复合材料表现出显着增强的染料光催化和光芬顿降解作用，并且在15%g-C3N4/LaFeO3复合材料中观察到最大活性。此外，复合材料的光芬顿性能远高于光催化或芬顿性能。光芬顿活性的大幅提高归因于Z型电子转移以及LaFeO3和g-C3N4之间的协同效应，光生电子-空穴对的有效分离。使用TPA作为探针分子通过PL光谱检查·OH自由基，清楚地揭示了·OH的产生，而且，·OH产率和染料降解率在不同催化过程情况下显示出类似的变化。这表明·OH 是导致染料降解的主要活性物质。讨论了复合材料的基本光芬顿机制。
Z-scheme g-C3N4/LaFeO3heterojunction photocatalysts were prepared by calcining the uniformly mixed g-C3N4nanosheets and LaFeO3nanoparticles at 300 °C for 1 h. The as-prepared g-C3N4/LaFeO3composites were systematically characterized by XRD, SEM, TEM, XPS, UV–vis DRS, PL spectroscopy, EIS and photocurrent response. It is demonstrated that LaFeO3nanoparticles (average size: ca. 35 nm) are uniformly assembled onto the surface of g-C3N4nanosheets through chemical bonding, leading to the formation of g-C3N4/LaFeO3heterojunctions. The photocatalytic, Fenton and photo-Fenton performances of the samples were investigated by degrading RhB using simulated sunlight as the light source. Compared to bare LaFeO3and g-C3N4, the g-C3N4/LaFeO3composites exhibit significantly enhanced photocatalytic and photo-Fenton degradation of the dye, and the maximum activity is observed for the 15%g-C3N4/LaFeO3composite. Moreover, the photo-Fenton performance of the composites is much higher than the photocatalytic or Fenton performances. The much improved photo-fenton activity is ascribed to the efficient separation of photogenerated electron-hole pairs due to the Z-scheme electron transfer and the synergistic effect between LaFeO3and g-C3N4. •OH radicals were examined by PL spectroscopy using TPA as a probe molecule, clearly revealing the •OH generation, and moreover, the •OH yield and the dye degradation rate show a similar variation between different cases of the catalysis process. This suggested that •OH is the dominant reactive species causing the dye degradation. The underlying photo-Fenton mechanism of the composites is discussed.
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