TiO₂ Nanotubes/Ag/MoS₂ Meshy Photoelectrode with Excellent Photoelectrocatalytic Degradation Activity for Tetracycline Hydrochloride

Nanomaterials
Tingting LiLixia Yang

Abstract

A novel type of TiO₂ nanotubes (NTs)/Ag/MoS₂ meshy photoelectrode was fabricated with highly oriented TiO₂ nanotube arrays grown from a Ti mesh supporting Ag nanoparticles and three-dimensional MoS₂ nanosheets. In this structure, Ag nanoparticles act as bridges to connect MoS₂ and TiO₂ and pathways for electron transfer, ensuring the abundant production of active electrons, which are the source of •O₂-. The TiO₂ NTs/Ag/MoS₂ mesh can be used as both photocatalyst and electrode, exhibiting enhanced photoelectrocatalytic efficiency in degrading tetracycline hydrochloride under visible light irradiation (λ ≥ 420 nm). Compared to unmodified TiO₂ NTs, the improved photoelectrocatalytic activity of the TiO₂ NTs/Ag/MoS₂ arise from the formation of Z-scheme heterojunctions, which facilitate the efficient separation of photogenerated electron-hole pairs through the Schottky barriers at the interfaces of TiO₂ NTs⁻Ag and Ag⁻MoS₂.

References

Jun 19, 2009·Environmental Science & Technology·Archana KarVaidyanathan Subramanian
Nov 29, 2011·ACS Applied Materials & Interfaces·Jianjun LiaoJianbao Li
Apr 14, 2016·Environmental Science and Pollution Research International·QiShe YanRuiQin Zhang
Feb 9, 2017·Journal of Hazardous Materials·Lixia YangGuifa Li

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Methods Mentioned

BETA
surface plasmon resonance
scanning
transmission electron microscopy
X-ray
electron diffraction
irradation
ESR

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