The preparation and photocatalytic performance of the Fe₂O₃/g‐C₃N₄ nanocomposites with different weight percentage of iron was investigated in this study. Samples were successfully synthesized using melamine and ferric nitrate as the precursors via the green and facile microwave‐assisted method. The physicochemical and structural properties of the Fe₂O₃‐doped g‐C₃N₄ were characterized by X‐ray diffraction (XRD), Fourier‐transform infrared spectroscopy (FT‐IR), the Brunauer–Emmett–Teller (BET) method, transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy (EDS), and ultraviolet–visible spectroscopy (UV–Vis). The photocatalytic activity of the Fe₂O₃/g‐C₃N₄ catalysts was evaluated by the degradation of methylene blue (MB) at room temperature under visible light irradiation. As expected, the as‐synthesized samples exhibited considerable improvement in the photodegradation of MB. The Fe₂O₃/g‐C₃N₄ (1.0 wt%) nanocomposite had superior photocatalytic activity, with almost 70% degradation efficiency within 90 min of irradiation. The enhanced performance was ascribed to the separation and migration of the photoinduced electron–hole pairs and taking part of the charge carriers in the chemical redox reactions at the surface of the photocatalyst. In this work, the effect of Fe weight percentage on the degradation potential was also studied, and the photocatalytic mechanism was proposed with the main reactive species •OH.

中文翻译：

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微波辅助合成Fe2O3 / g-C3N4纳米复合材料的光催化活性增强，可降解亚甲基蓝

研究了不同铁含量的Fe ₂ O ₃ / g-C ₃ N ₄纳米复合材料的制备和光催化性能。使用三聚氰胺和硝酸铁作为前体，通过绿色便捷的微波辅助方法成功合成了样品。Fe ₂ O ₃掺杂的g‐C ₃ N ₄的物理化学和结构性质通过X射线衍射（XRD），傅立叶变换红外光谱（FT-IR），Brunauer-Emmett-Teller（BET）方法，透射电子显微镜（TEM），扫描电子显微镜（SEM），能量色散进行了表征X射线光谱（EDS）和紫外可见光谱（UV-Vis）。通过在可见光照射下室温下亚甲基蓝（MB）的降解来评估Fe ₂ O ₃ / g-C ₃ N ₄催化剂的光催化活性。正如预期的那样，合成后的样品在MB的光降解方面表现出了很大的改善。Fe ₂ O ₃ / g‐C ₃ N ₄（1.0 wt％）纳米复合材料具有优异的光催化活性，在辐射90分钟内降解率接近70％。增强的性能归因于光致电子-空穴对的分离和迁移，并在光催化剂表面的化学氧化还原反应中占据了一部分电荷载流子。在这项工作中，还研究了铁的重量百分数对降解电位的影响，并提出了以主要的反应性物种•OH为光催化机理。