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Microfluidic assembly of WO3/MoS2 Z-scheme heterojunction as tandem photocatalyst for nitrobenzene hydrogenation

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Abstract

Heterojunction-based photocatalyst plays an important role in the various heterogeneous catalyses. Z-scheme photocatalytic systems with two semiconductor materials are suitable for harvesting solar energy, while the advanced nanostructuring tools for the fabrication of Z-scheme heterojunction are limited. Here, WO3/MoS2 (W/M0.2) heterojunction composites were constructed in a microfluidic system with enhanced assembly efficiency, and the photocatalytic performance has been investigated using X-ray photoelectron spectroscopy (XPS), Mott–Schottky (M–S) analysis and gas chromatograph-mass spectrometer (GC–MS). In addition, in the reduction of nitrobenzene, the photogenerated hole (h+) oxidation of formic acid (HCOOH) provides the hydrogen source and the deposited Pd nanoparticles are enriched with photogenerated electrons for improving the transfer hydrogenation efficiency. The microfluidic-prepared tandem photocatalyst gives a meaningful guidance for the design and synthesis of heterojunction catalysts, which is promising for energy maximizing control systems.

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摘要

异质结基光催化剂在各种多相催化中发挥着重要作用。具有两种半导体材料的 Z 型光催化系统适用于收集太阳能，而用于制造 Z 型异质结的先进纳米结构工具有限。本文在微流控系统中构建了WO3/MoS2(W/M0.2)异质结复合材料，并用X射线光电子能谱(XPS)、莫特-肖特基(M–S)分析和气相色谱-质谱仪(GC-MS)对其光催化性能进行了研究。此外，在硝基苯还原过程中，空穴(h+)氧化甲酸(HCOOH)提供氢源，沉积的Pd纳米颗粒富集了光生电子，提高了转移加氢效率。微流控制备的串联光催化剂为异质结催化剂的设计和合成提供了有意义的指导，在能量最大化控制系统中具有广阔的应用前景。

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Acknowledgements

This work was financially supported by Jiangsu Provincial Double-Innovation Doctor Program (No. JSSCBS20210996).

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Authors and Affiliations

  1. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212000, China

    Qing Wang, Xuan-Xuan Cao, Tao Liu, Kang-Jie Wu, Juan Deng, Jing-Sheng Chen, Yue-Ji Cai, Chao Yu & Wei-Kang Wang

  2. Department of Earth and Environmental Engineering, Columbia University, New York, NY, 10027, USA

    Meng-Qi Shen

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  1. Qing Wang
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Correspondence to Chao Yu or Wei-Kang Wang.

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Wang, Q., Cao, XX., Liu, T. et al. Microfluidic assembly of WO3/MoS2 Z-scheme heterojunction as tandem photocatalyst for nitrobenzene hydrogenation. Rare Met. 42, 484–494 (2023). https://doi.org/10.1007/s12598-022-02169-w

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