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. 2018 Aug 27;8(9):666.
doi: 10.3390/nano8090666.

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

Tingting Li  1   2 , Zhuhong Wang  3   4 , Chaochao Liu  5   6 , Chunmin Tang  7   8 , Xinkai Wang  9   10 , Gongsheng Ding  11   12 , Yichun Ding  13   14 , Lixia Yang  15   16
Affiliations

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

Tingting Li et al. Nanomaterials (Basel). .

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.

Keywords: TiO2 nanotubes/Ag/MoS2; photoelectrocatalytic degradation; photoelectrode; tetracycline hydrochloride.

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Conflict of interest statement

The authors declare that they have no conflict of interest.

Figures

Figure 1
Figure 1
Digital pictures of (a) TiO2 nanotubes (NTs); (b) TiO2 NTs/Ag; (c) TiO2 NTs/MoS2; and (d) TiO2 NTs/Ag/MoS2 mesh.
Figure 2
Figure 2
SEM images of (a) TiO2 NTs; (b) TiO2 NTs/Ag; and (c) TiO2 NTs/Ag/MoS2; (d) EDS analysis of TiO2 NTs/Ag/MoS2.
Figure 3
Figure 3
TEM images of (a) TiO2 NTs; (b) TiO2 NTs/Ag; and (c) TiO2 NTs/Ag/MoS2 (inset: SAED pattern); (d) HRTEM image of TiO2 NTs/Ag/MoS2.
Figure 4
Figure 4
XRD patterns of (a) TiO2 NTs; (b) TiO2 NTs/Ag; and (c) TiO2 NTs/Ag/MoS2.
Figure 5
Figure 5
X-ray photoelectron spectroscopy (XPS) spectra of TiO2 NTs/Ag/MoS2: (a) survey, (b) Ag 3d, (c) Ti 2p, (d) Mo 3d, and (e) S 2p.
Figure 6
Figure 6
Nitrogen absorption–desorption isotherms of TiO2 NTs, TiO2 NTs/Ag, TiO2 NTs/MoS2, and TiO2 NTs/Ag/MoS2.
Figure 7
Figure 7
(a) UV-vis diffuse reflectance spectra; (b) PL spectra of TiO2 NTs, TiO2 NTs/Ag, TiO2 NTs/MoS2, and TiO2 NTs/Ag/MoS2.
Figure 8
Figure 8
(a) Photocurrent responses; (b) electrochemical impedance spectroscopy (EIS) Nyquist plots of TiO2 NTs, TiO2 NTs/Ag, TiO2 NTs/MoS2, and TiO2 NTs/Ag/MoS2.
Figure 9
Figure 9
(a) The photoelectrocatalytic (PEC) efficiencies of TC·HCl under different conditions; (b) UV-vis absorption spectra for the degradation of TC·HCl on the TiO2 NTs/Ag/MoS2.
Figure 10
Figure 10
Cycling runs in the PEC degradation of TC·HCl over the TiO2 NTs/Ag/MoS2.
Figure 11
Figure 11
The PEC efficiencies of TC·HCl with different scavengers over the TiO2 NTs/Ag/MoS2: no scavenger; with 1 mM ethylenediamintetraacetic acid disodium (EDTA-2Na); with 1 mM tert-butyl alcohol (TBA); and with 1 mM 1,4-benzoquinone (BQ).
Scheme 1
Scheme 1
Schematic illustration of proposed mechanism of the photogenerated electrons and holes transfer in the TiO2 NTs/Ag/MoS2 interface.
See this image and copyright information in PMC

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