The construction of a multifunctional two-dimensional (2D) composite photocatalyst is of great significance because such a composite can exhibit enhanced catalytic performance and improved practical usability in contrast to a single component catalyst. Herein, a ternary photocatalyst composed of g-C₃N₄, a carbon layer (C), and Fe₃O₄ nanoparticles was successfully synthesized by a facile one-pot hydrothermal carbonization (HTC) method from g-C₃N₄, glucose, and FeCl₃. The resultant composite, Fe₃O₄/C/g-C₃N₄, had an ordered 2D heterostructure and exhibited enhanced visible-light-driven photocatalytic performances and good magnetic recyclability. The k_obs for Cr(VI) photoreduction (or dimethoate photodegradation) over Fe₃O₄/C/g-C₃N₄ was 20.9-fold (or 2.1-fold) of that over g-C₃N₄. Comparative study of Fe₃O₄/C/g-C₃N₄, C/g-C₃N₄, and g-C₃N₄ on their optoelectronic properties revealed that this enhanced photocatalytic activity was mainly due to rapid photogenerated electron transport from the g-C₃N₄ component to carbon and/or Fe₃O₄, which effectively suppressed the recombination of photogenerated electrons and holes. In addition, the good surface adsorption capacity of the carbon component towards Cr(VI) also contributed to Cr(VI) photoreduction over Fe₃O₄/C/g-C₃N₄. Finally, a reasonable photocatalytic reaction mechanism of Fe₃O₄/C/g-C₃N₄ was proposed based on the results of trapping experiments. This study is not only limited to developing a high-performance g-C₃N₄ based photocatalyst, but also expected to provide a green, facile, and cost-efficient strategy to combine 2D materials with a carbonaceous layer and other functional components for a multifunctional system.

中文翻译：

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通过水热碳化法 简单地制备Fe ₃ O ₄ / C / gC ₃ N ₄二维复合材料，并在可见光下增强了光催化性能†

多功能二维（2D）复合光催化剂的构建具有重要意义，因为与单组分催化剂相比，这种复合物可以表现出增强的催化性能和改善的实用性。本文中，由gC ₃ N ₄，葡萄糖和FeCl通过一锅法水热碳化（HTC）成功地合成了由gC ₃ N ₄，碳层（C）和Fe ₃ O ₄纳米颗粒组成的三元光催化剂。₃。所得复合材料Fe ₃ O ₄ / C / gC ₃ N ₄，具有有序的2D异质结构，并表现出增强的可见光驱动的光催化性能和良好的磁可回收性。该ķ _OBS对Cr（VI超过Fe）的光致还原（或乐果光降解）₃ ö ₄ / C / GC ₃ Ñ ₄为20.9倍（或2.1倍）的，超过GC ₃ Ñ ₄。Fe ₃ O ₄ / C / gC ₃ N ₄，C / gC ₃ N ₄和gC ₃ N _{4的比较研究}关于它们的光电性能的研究表明，这种增强的光催化活性主要归因于从gC ₃ N ₄组分到碳和/或Fe ₃ O _4的快速光生电子传输，这有效地抑制了光生电子和空穴的复合。此外，碳成分对Cr（VI）的良好表面吸附能力也有助于Cr（VI）在Fe ₃ O ₄ / C / gC ₃ N _4上的光还原。最后，合理的Fe ₃ O ₄ / C / gC ₃ N光催化反应机理根据诱集实验的结果提出了_4种方法。这项研究不仅限于开发高性能的基于gC ₃ N ₄的光催化剂，而且还有望提供一种绿色，简便且经济高效的策略，以将2D材料与碳质层和其他功能组件结合在一起，形成多功能系统。