Microfluidic assembly of WO_(3)/MoS_(2)Z-scheme heterojunction as tandem photocatalyst for nitrobenzene hydrogenation

摘要

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,WO_(3)/MoS_(2)(W/M_(0.2))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),MottSchottky(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.