DOI: 10.1016/j.watres.2018.03.030
Scopus记录号: 2-s2.0-85044017163
论文题名: Evaluating tetracycline degradation pathway and intermediate toxicity during the electrochemical oxidation over a Ti/Ti4O7 anode
作者: Wang J. ; Zhi D. ; Zhou H. ; He X. ; Zhang D.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 137 起始页码: 324
结束页码: 334
语种: 英语
英文关键词: Degradation pathway
; Electrochemical oxidation
; Tetracycline
; Ti/Ti4O7 anode
; Toxicity assessment
Scopus关键词: Anodes
; Antibiotics
; Bioluminescence
; Chromatography
; Computational chemistry
; Degradation
; Dyes
; Efficiency
; Electrodes
; Free radicals
; Oxidation
; Phosphorescence
; Plasma spraying
; Reaction intermediates
; Risk assessment
; Toxicity
; Bioluminescence inhibitions
; Degradation pathways
; High performance liquid chromatographs
; Pseudo first-order kinetics
; Quantitative structure activity relationships (QSAR)
; Short-chain carboxylic acids
; Tetracycline
; Toxicity assessment
; Electrochemical oxidation
; amine
; carbamic acid
; hydroxyl radical
; methanol
; oxalic acid
; phenol derivative
; tetracycline
; titanium
; placenta lactogen
; tetracycline
; titanium
; antibiotics
; assessment method
; bacterium
; bioluminescence
; degradation
; efficiency measurement
; electrochemical method
; electrode
; oxidation
; performance assessment
; pollutant removal
; toxicity
; wastewater treatment
; Article
; bioluminescence
; current density
; degradation
; degradation kinetics
; diffraction
; ecotoxicity
; electric conductivity
; electrochemical analysis
; electron transport
; high performance liquid chromatography
; kinetic parameters
; limit of detection
; liquid chromatography-mass spectrometry
; mass fragmentography
; molecular weight
; oxidation
; priority journal
; quantitative structure activity relation
; rate constant
; reaction time
; scanning electron microscopy
; surface property
; X ray diffraction
; Aliivibrio fischeri
; chemistry
; devices
; drug effect
; electrochemical analysis
; electrode
; kinetics
; luminescence
; oxidation reduction reaction
; water pollutant
; Aliivibrio fischeri
; Electrochemical Techniques
; Electrodes
; Gas Chromatography-Mass Spectrometry
; Kinetics
; Luminescent Measurements
; Oxidation-Reduction
; Placental Lactogen
; Quantitative Structure-Activity Relationship
; Tetracycline
; Titanium
; Water Pollutants, Chemical
英文摘要: Tetracycline (TC) is one of the most widely used antibiotics with significant impacts on human health and thus it needs appropriate approaches for its removal. In the present study, we evaluated the performance and complete pathway of the TC electrochemical oxidation on a Ti/Ti4O7 anode prepared by plasma spraying. Morphological data and composition analysis indicated a compact coating layer on the anode, which had the characteristic peaks of Ti4O7 as active constituent. The TC electrochemical oxidation on the Ti/Ti4O7 anode followed a pseudo-first-order kinetics, and the TC removal efficiency reached 95.8% in 40 min. The influential factors on TC decay kinetics included current density, anode-cathode distance and initial TC concentration. This anode also had high durability and the TC removal efficiency was maintained over 95% after five times reuse. For the first time, we unraveled the complete pathway of the TC electrochemical oxidation using high-performance liquid chromatograph (HPLC) and gas chromatograph (GC) coupled with mass spectrometer (MS). ·OH radicals produced from electrochemical oxidation attack the double bond, phenolic group and amine group of TC, forming a primary intermediate (m/z = 461), secondary intermediates (m/z = 432, 477 and 509) and tertiary intermediates (m/z = 480, 448 and 525). The latter were further oxidized to the key downstream intermediate (m/z = 496), followed by further downstream intermediates (m/z = 451, 412, 396, 367, 351, 298 and 253) and eventually short-chain carboxylic acids. We also evaluated the toxicity change during the electrochemical oxidation process with bioluminescent bacteria. The bioluminescence inhibition ratio peaked at 10 min (55.41%), likely owing to the high toxicity of intermediates with m/z = 461, 432 and 477 as obtained from quantitative structure activity relationship (QSAR) analysis. The bioluminescence inhibition ratio eventually decreased to 16.78% in 40 min due to further transformation of TC and intermediates. By comprehensively analyzing the influential factors and complete degradation pathway of TC electrochemical oxidation on the Ti/Ti4O7 anode, our research provides deeper insights into the risk assessment of intermediates and their toxicity, assigning new perspectives for practical electrochemical oxidation to effectively eliminate the amount and toxicity of TC and other antibiotics in wastewater. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112823
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: School of Chemical and Environmental Engineering, Beijing Campus, China University of Mining and Technology, Beijing, 100083, China; School of Environment, Tsinghua University, Beijing, 100084, China
Recommended Citation:
Wang J.,Zhi D.,Zhou H.,et al. Evaluating tetracycline degradation pathway and intermediate toxicity during the electrochemical oxidation over a Ti/Ti4O7 anode[J]. Water Research,2018-01-01,137