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Nanomaterials (Basel). 2018 Aug 27;8(9). pii: E666. doi: 10.3390/nano8090666.

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

Li T1,2, Wang Z3,4, Liu C5,6, Tang C7,8, Wang X9,10, Ding G11,12, Ding Y13,14, Yang L15,16.

Author information

1
College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China. tingtingli1983@hotmail.com.
2
Key Laboratory of Jiangxi Province for Persisitent Pollutants Control and Resources Recyle, Nanchang Hangkong University, Nanchang 330063, China. tingtingli1983@hotmail.com.
3
College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China. 13207180115@163.com.
4
Key Laboratory of Jiangxi Province for Persisitent Pollutants Control and Resources Recyle, Nanchang Hangkong University, Nanchang 330063, China. 13207180115@163.com.
5
College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China. 15179207173@163.com.
6
Key Laboratory of Jiangxi Province for Persisitent Pollutants Control and Resources Recyle, Nanchang Hangkong University, Nanchang 330063, China. 15179207173@163.com.
7
College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China. 18296494686@163.com.
8
Key Laboratory of Jiangxi Province for Persisitent Pollutants Control and Resources Recyle, Nanchang Hangkong University, Nanchang 330063, China. 18296494686@163.com.
9
College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China. 18870922448@163.com.
10
Key Laboratory of Jiangxi Province for Persisitent Pollutants Control and Resources Recyle, Nanchang Hangkong University, Nanchang 330063, China. 18870922448@163.com.
11
College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China. dinggongsheng@126.com.
12
Key Laboratory of Jiangxi Province for Persisitent Pollutants Control and Resources Recyle, Nanchang Hangkong University, Nanchang 330063, China. dinggongsheng@126.com.
13
College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China. chempoem@126.com.
14
Key Laboratory of Jiangxi Province for Persisitent Pollutants Control and Resources Recyle, Nanchang Hangkong University, Nanchang 330063, China. chempoem@126.com.
15
College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China. yanglixia829@163.com.
16
Key Laboratory of Jiangxi Province for Persisitent Pollutants Control and Resources Recyle, Nanchang Hangkong University, Nanchang 330063, China. yanglixia829@163.com.

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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