Simple fabrication of Fe3O4/C/g-C3N4 two-dimensional composite by hydrothermal carbonization approach with enhanced photocatalytic performance under visible light
Simple fabrication of Fe3O4/C/g-C3N4 two-dimensional composite by hydrothermal carbonization approach with enhanced photocatalytic performance under visible light
复制标题
通过水热碳化方法简单制备 Fe3O4/C/g-C3N4 二维复合材料，并增强可见光下的光催化性能
DOI：
10.1039/c8cy00698a
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发表时间：
2018-07-21
影响因子：
5
通讯作者：
Chen, Hao
中科院分区：
文献类型：
--
作者：
Ding, Xing;Xiao, Dong;Chen, Hao
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际可用性。本文以g-C3 N4、葡萄糖和FeCl 3为原料，采用一锅水热碳化法（HTC）成功合成了由g-C3 N4、碳层（C）和Fe 3 O 4纳米颗粒组成的三元光催化剂。所得复合材料Fe 3 O 4/C/g-C3 N4具有有序的二维异质结构，并表现出增强的可见光催化性能和良好的磁性可回收性。Fe_3 O_4/C/g-C_3 N_4上Cr（VI）光还原（或乐果光降解）的kobs是g-C_3 N_4上的20.9倍（或2.1倍）。对比研究了Fe 3 O 4/C/g-C3 N4、C/g-C3 N4和g-C3 N4的光催化性能，发现这种光催化活性的增强主要是由于光生电子从g-C3 N4组分向碳和/或Fe 3 O 4的快速传输，有效地抑制了光生电子和空穴的复合。此外，碳组分对Cr（VI）的良好表面吸附能力也有助于Cr（VI）在Fe 3 O 4/C/g-C3 N4上的光还原。最后，根据捕集实验结果，提出了Fe 3 O 4/C/g-C3 N4光催化反应机理。本研究不仅限于开发高性能的g-C3 N4基光催化剂，而且还有望提供一种绿色，简便，成本效益高的策略，将联合收割机二维材料与碳层和其他功能组分结合起来，形成多功能系统。
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 kobs 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.