Efficient degradation of tetracycline by heterogeneous electro-Fenton process using Cu-doped Fe@Fe2O3: Mechanism and degradation pathway

Luo, Ting; Feng, Haopeng; Tang, Lin; Lu, Yue; Tang, Wangwang; Chen, Song; Yu, Jiangfang; Xie, Qingqing; Ouyang, Xilian; Chen, Zhaoming

doi:10.1016/j.cej.2019.122970

Cited by 167 publications

(42 citation statements)

References 54 publications

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“…During the electrochemical process, initial solution pH affects not only the formation of free radicals, but also the existing state of organic matter in the solution. Thus, it is considered as one of the most important factors affecting the degradation process [ 27 , 28 , 30 , 31 ]. As can be seen in Figure 4 e, the optimum pH value was 4.74 and the Ka value was about 2 times higher than that at pH 6.57 and pH 7.78.…”

Section: Resultsmentioning

confidence: 99%

“…Under alkaline conditions, the large amount of the OH − contained in the solution can react with the large amount of the ·OH catalyzed by the electrode to produce the less oxidizing ·O − [ 30 , 33 ]. Its present species in solution is strongly affected by the pH value due to the protonation or deprotonation of amino and hydroxyl groups bound to the aromatic ring [ 31 , 32 , 34 , 35 ]. Under different pH conditions, TC could be dissociated into different species, such as protonated form TCH 3+ (pH < 3.3), neutral form TCH 2 (3.3 < pH < 7.7) and deprotonated form TCH − (7.7 < pH < 9.7) and TC 2− (pH > 9.7) [ 33 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

Section: Factors Influencing Tc Electrochemical Oxidationmentioning

confidence: 99%

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Electrochemical Degradation of Tetracycline Using a Ti/Ta2O5-IrO2 Anode: Performance, Kinetics, and Degradation Mechanism

et al. 2021

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Tetracycline (TC) is widely used in production and in life. The high volume of its use and the difficulty of its disposal have become the most important causes of environmental pollution. A suitable method needs to be found to solve this problem. In this study, the Ti/Ta2O5-IrO2 electrode was characterized for its surface morphology and crystal composition. The electrochemical catalytic ability of the Ti/Ta2O5-IrO2 electrode was investigated using LSV and CV tests. The electrochemical degradation of tetracycline (TC) in water with a Ti/Ta2O5-IrO2 anode was investigated. The main influence factors, such as current density (2.5–10 mA/cm2), electrode spacing (20–40 mm), initial TC concentration (20–80 mg/L) and initial solution pH (4.74–9.48) were analyzed in detail and their influences on reaction kinetics was summed up. The removal rate increased along with the increasing current density, decreasing initial TC concentration and decreasing of electrode distance under the experimental conditions. The optimum pH was 4.74. UV–vis, total organic carbon (TOC) and high-performance liquid chromatography-mass spectrometry (HPLC-MS) analyses were used to reveal the mechanism of TC degradation. Nine main intermediates were identified, and the degradation pathways were proposed. A new insight has been postulated for the safe and efficient degradation of TC using the Ti/Ta2O5-IrO2 electrode.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Electrochemical Degradation of Tetracycline Using a Ti/Ta2O5-IrO2 Anode: Performance, Kinetics, and Degradation Mechanism

et al. 2021

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“…Therefore, increasing the current enhances charge distribution through the cathode, leading to an increase in hydroxyl radical concentration within the solution. Nevertheless, the excessive current can promote side reactions such as H 2 O 2 decomposition (Equation (20)) and a reduction of as-generated protons to hydrogen gas (Equation ( 21)) [15,18]:…”

Section: Influence Of Applied Current Intensitymentioning

confidence: 99%

Heterogeneous Electro-Fenton as “Green” Technology for Pharmaceutical Removal: A Review

et al. 2021

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The presence of pharmaceutical products in the water cycle may cause harmful effects such as morphological, metabolic and sex alterations in aquatic organisms and the selection/development of organisms resistant to antimicrobial agents. The compounds’ stability and persistent character hinder their elimination by conventional physico-chemical and biological treatments and thus, the development of new water purification technologies has drawn great attention from academic and industrial researchers. Recently, the electro-Fenton process has been demonstrated to be a viable alternative for the removal of these hazardous, recalcitrant compounds. This process occurs under the action of a suitable catalyst, with the majority of current scientific research focused on heterogeneous systems. A significant area of research centres working on the development of an appropriate catalyst able to overcome the operating limitations associated with the homogeneous process is concerned with the short service life and difficulty in the separation/recovery of the catalyst from polluted water. This review highlights a present trend in the use of different materials as electro-Fenton catalysts for pharmaceutical compound removal from aquatic environments. The main challenges facing these technologies revolve around the enhancement of performance, stability for long-term use, life-cycle analysis considerations and cost-effectiveness. Although treatment efficiency has improved significantly, ongoing research efforts need to deliver economic viability at a larger scale due to the high operating costs, primarily related to energy consumption.

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“…14,21 Among the technologies, advanced oxidation processes (AOPs) as potentially powerful technologies have been successfully used for the removal of antibiotics and other refractory pollutants, such as photocatalysis, [22][23][24] photo-Fenton, 25,26 ozonation 21,27 and electro-Fenton processes. 28,29 AOPs as oxidation technologies are based on the production of hydroxyl radicals (cOH), which have a strong electrochemical oxidant potential. 30 Especially, electro-Fenton process (EF) is one of the most common electrochemical advanced oxidation processes (EAOP) with high efficiency and strong degradation capacity that has attracted considerable attention.…”

Section: Introductionmentioning

confidence: 99%

A novel bio-electro-Fenton system with dual application for the catalytic degradation of tetracycline antibiotic in wastewater and bioelectricity generation

et al. 2021

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Efficient degradation of tetracycline by heterogeneous electro-Fenton process using Cu-doped Fe@Fe2O3: Mechanism and degradation pathway

Cited by 167 publications

References 54 publications

Electrochemical Degradation of Tetracycline Using a Ti/Ta2O5-IrO2 Anode: Performance, Kinetics, and Degradation Mechanism

Electrochemical Degradation of Tetracycline Using a Ti/Ta2O5-IrO2 Anode: Performance, Kinetics, and Degradation Mechanism

Heterogeneous Electro-Fenton as “Green” Technology for Pharmaceutical Removal: A Review

A novel bio-electro-Fenton system with dual application for the catalytic degradation of tetracycline antibiotic in wastewater and bioelectricity generation

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