3D-printed MoS2/Ni electrodes with excellent electro-catalytic performance and long-term stability for dechlorination of florfenicol

Jianhui Xu; Pengxu Wang; Shenggui Chen; Lei Li; Dan Li; Yunfei Zhang; Qi Wu; Jinhong Fan; Luming Ma

doi:10.1016/j.jes.2022.11.004

3D-printed MoS₂/Ni electrodes with excellent electro-catalytic performance and long-term stability for dechlorination of florfenicol

J Environ Sci (China). 2024 Mar:137:420-431. doi: 10.1016/j.jes.2022.11.004. Epub 2022 Nov 15.

Authors

Jianhui Xu¹, Pengxu Wang¹, Shenggui Chen², Lei Li¹, Dan Li¹, Yunfei Zhang³, Qi Wu¹, Jinhong Fan⁴, Luming Ma⁵

Affiliations

¹ School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China.
² School of Art and Design, Guangzhou Panyu Polytechnic, Guangzhou 511483, China; Dongguan Institute of Science and Technology Innovation, Dongguan University of Technology, Dongguan 523808, China; School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China.
³ School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China; National Engineering Research Center for Urban Pollution Control, State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: yfzhang@dgut.edu.cn.
⁴ National Engineering Research Center for Urban Pollution Control, State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: jinhongfan@tongji.edu.cn.
⁵ National Engineering Research Center for Urban Pollution Control, State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.

PMID: 37980027
DOI: 10.1016/j.jes.2022.11.004

Abstract

Here, we report the production of 3D-printed MoS₂/Ni electrodes (3D-MoS₂/Ni) with long-term stability and excellent performance by the selective laser melting (SLM) technique. As a cathode, the obtained 3D-MoS₂/Ni could maintain a degradation rate above 94.0% for florfenicol (FLO) when repeatedly used 50 times in water. We also found that the removal rate of FLO by 3D-MoS₂/Ni was about 12 times higher than that of 3D-printed pure Ni (3D-Ni), attributed to the improved accessibility of H*. In addition, the electrochemical characterization results showed that the electrochemically active surface area of the 3D-MoS₂/Ni electrode is about 3-fold higher than that of the 3D-Ni electrode while the electrical resistance is 4 times lower. Based on tert-butanol suppression, electron paramagnetic resonance and triple quadrupole mass spectrometer experiments, a "dual path" mechanism and possible degradation pathway for the dechlorination of FLO by 3D-MoS₂/Ni were proposed. Furthermore, we also investigated the impacts of the cathode potential and the initial pH of the solution on the degradation of FLO. Overall, this study reveals that the SLM 3D printing technique is a promising approach for the rapid fabrication of high-stability metal electrodes, which could have broad application in the control of water contaminants in the environmental field.

Keywords: 3D-print; Antibiotic Florfenicol; Electroreduction; MoS(2)/Ni.

MeSH terms

Electrodes
Metals*
Molybdenum*
Water / chemistry

Substances

florfenicol
Molybdenum
Metals
Water