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Efficient Electrochemical Oxidation of Chloramphenicol by Novel Reduced TiO(2) Nanotube Array Anodes: Kinetics, Reaction Parameters, Degradation Pathway and Biotoxicity Forecast

The key component of electrochemical advanced oxidation technology are high-efficiency anodes, and highly efficient and simple-to-prepare materials have generated a lot of interest. In this study, novel self-supported Ti(3+)-doped titanium dioxide nanotube arrays (R-TNTs) anodes were successfully pr...

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Detalles Bibliográficos
Autores principales: Wang, Pengqi, Chu, Guangyi, Gao, Guangfei, Li, Fengchun, Ren, Yi, Ding, Yue, Gu, Yawei, Jiang, Wenqiang, Zhang, Xuan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10254203/
https://www.ncbi.nlm.nih.gov/pubmed/37297106
http://dx.doi.org/10.3390/ma16113971
Descripción
Sumario:The key component of electrochemical advanced oxidation technology are high-efficiency anodes, and highly efficient and simple-to-prepare materials have generated a lot of interest. In this study, novel self-supported Ti(3+)-doped titanium dioxide nanotube arrays (R-TNTs) anodes were successfully prepared by a two-step anodic oxidation and straightforward electrochemical reduction technique. The electrochemical reduction self-doping treatment produced more Ti(3+) sites with stronger absorption in the UV-vis region, a band gap reduction from 2.86 to 2.48 ev, and a significant increase in electron transport rate. The electrochemical degradation effect of R-TNTs electrode on chloramphenicol (CAP) simulated wastewater was investigated. At pH = 5, current density of 8 mA cm(−2), electrolyte concentration of 0.1 M sodium sulfate (Na(2)SO(4)), initial CAP concentration of 10 mg L(−1), CAP degradation efficiency exceeded 95% after 40 min. In addition, molecular probe experiments and electron paramagnetic resonance (EPR) tests revealed that the active species were mainly •OH and SO(4)(−), among which •OH played a major role. The CAP degradation intermediates were discovered using high-performance liquid chromatography-mass spectrometry (HPLC-MS), and three possible degradation mechanisms were postulated. In cycling experiments, the R-TNTs anode demonstrated good stability. The R-TNTs prepared in this paper were an anode electrocatalytic material with high catalytic activity and stability, which could provide a new approach for the preparation of electrochemical anode materials for difficult-to-degrade organic compounds.