Recent electrochemical methods in electrochemical degradation of halogenated organics: a review

Zhang, Meng; Qiu, Shi; Song, Xiaozhe; Wang, Hui; Bian, Zhaoyong

doi:10.1007/s11356-019-04533-3

Cited by 85 publications

(26 citation statements)

References 257 publications

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“…In the preliminary work, Sb-SnO 2 electrode shell (central electrode) and Fe 3 O 4 /Sb-SnO 2 magnetic particles (auxiliary electrodes) were used for electrochemical oxidation. The Sb-SnO 2 electrode did not perform well in terms of stability [4], and the accelerated life of the previous 2.5D electrode was only 24 h [27], which would limit its further industrial application. The PbO 2 electrode was a typical titanium-based electrode with excellent stability and high hydroxyl radical yield [29].…”

Section: Introductionmentioning

confidence: 95%

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A 2.5D Electrode System Constructed of Magnetic Sb–SnO2 Particles and a PbO2 Electrode and Its Electrocatalysis Application on Acid Red G Degradation

et al. 2019

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A novel electrode consisting of a Ti/PbO2 shell and Fe3O4/Sb–SnO2 particles was developed for electrochemical oxidation treatment of wastewater. Scanning electron microscope (SEM), X-ray diffraction (XRD), the current limiting method, toxicity experiments, and high-performance liquid chromatography were adopted to characterize its morphology, crystal structure, electrochemical properties, the toxicity of the wastewater, and hydroxyl radicals. Acid Red G (ARG), a typical azo dye, was additionally used to test the oxidation ability of the electrode. Results indicated that the 2.5D electrode could significantly improve the mass transfer coefficient and •OH content of the 2D electrode, thereby enhancing the decolorization, degradation, and mineralization effect of ARG, and reducing the toxicity of the wastewater. The experiments revealed that, at higher current density, lower dye concentration and higher temperature, the electrochemical oxidation of ARG favored. Under the condition of 50 mA/cm2, 25 °C, and 100 ppm, the ARG, Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC) removal efficiency reached 100%, 65.89%, and 52.52%, respectively, and the energy consumption and the current efficiency were 1.06 kWh/g COD, 8.29%, and energy consumption for TOC and mineralization current efficiency were 3.81 kWh/g COD, 9.01%. Besides, the Fe3O4/Sb–SnO2 particles after electrolysis for 50 h still had remarkable stability. These results indicated that the ARG solution could be adequately removed on the 2.5D electrode, providing an effective method for wastewater treatment.

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Section: Introductionmentioning

confidence: 95%

“…Electrochemical oxidation (EO) is an environmentally friendly technology for treatment of hazardous or refractory contaminants from wastewater [1][2][3][4][5]. The application of EO is highly promising for yielding some useful by-products.…”

Section: Introductionmentioning

confidence: 99%

A 2.5D Electrode System Constructed of Magnetic Sb–SnO2 Particles and a PbO2 Electrode and Its Electrocatalysis Application on Acid Red G Degradation

et al. 2019

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“…Besides, some other strategies like optimizing the operating parameters are also proved to useful in mitigating the HER process. More information can refer to the recent reviews …”

Section: Critical Factors For Controlling the Electroreductive Dehalomentioning

confidence: 99%

Insights into Electroreductive Dehalogenation Mechanisms of Chlorinated Environmental Pollutants

et al. 2020

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The electroreductive cleavage of carbon‐chloro bonds has attracted increasing attention from both environmental and mechanistic points of view over the past decades, taking into consideration a large variety of chlorinated organic compounds. Important discoveries have been made on the underlying electron/hydrogen transfer mechanisms and the enhancement of dechlorination performance for electrocatalysis purposes over the last years. However, there is still missing a combined knowledge from individual researches to specially elucidate the electroreductive dehalogenation mechanisms of organic chlorides. Herein, we summarize the diverse electrochemical strategies applied to reductive dehalogenation of chlorinated environmental pollutants, including direct electrochemical reduction, electrocatalytic hydro‐dechlorination and electrochemically mediated reduction methods, and, especially, highlight the differences in reductive dehalogenation mechanisms. Specifically, direct electron transfer is the most common dechlorination mechanism involved in the direct electrochemical reduction of organic chlorides, in which the electron transfer to C−Cl bonds can be classified as concerted or stepwise dissociative electron transfer mechanism. Indirect atomic hydrogen reduction is the primary dechlorination mechanism in the electrocatalytic hydro‐dechlorination process, which often competes with the direct electrochemical reduction route. Electrochemically mediated reduction, as another indirect route, uses a redox‐active mediator to indirectly transfer electrons from cathode to organic chlorides, resulting in reductive dehalogenation reaction. Moreover, the effects of critical factors on the dehalogenation reactivity and mechanisms are also discussed to better demonstrate the electroreductive dehalogenation of organic chlorides. Lastly, this contribution highlights recent relevant advances in electroreductive dehalogenation issues, as well as the challenges and potentials of this process.

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“…An adsorption process (AP) is the increase in the concentration of a particular component at the interface between two phases, the surface, and pollutant or bulk solution. Adsorption is a process, which increases in the density of gas or solute (adsorbate) in the vicinity of the surface of a substrate (adsorbent) due to molecular interactions between the adsorbate and the adsorbent [73]. Adsorption is controlled by various parameters such as temperature, nature of adsorbate and adsorbent, presence of other pollutants along with the experimental conditions (pH, contact time, particle size, and concentration of adsorbate) [74,75].…”

Section: Adsorption Processes (Aps)mentioning

confidence: 99%

“…Some coupled and hybrid electrochemical processes have been proposed to improve the removal efficiency of halogenated organic contaminants and to reduce the application costs [47,73]. They include the combination of electrochemical reduction-oxidation (ERÀ O), electro-Fenton (EF), and irradiated EO, as well as the application of biochemical methods [73]. In electrochemical reduction-oxidation, generally, oxidants produced on the anode surface can degrade most organic matter [8,87].…”

Section: Coupled or Combined Electrochemical Processesmentioning

confidence: 99%

A Review on Electrochemical Degradation and Biopolymer Adsorption Treatments for Toxic Compounds in Pharmaceutical Effluents

et al. 2020

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Pharmaceutical industries generate very large quantities of toxic organic compounds which include volatile organic compounds (VOCs) and/or organic volatile impurities (OVIs). These toxic compounds, amongst which are emerging residual solvents, largely come from wastewater treatment plants (WWTPs) and are being continuously dumped into the environment at an alarming rate. Efficient treatment of pharmaceutical wastewaters (effluents) is currently a major challenge because of not only the enormous quantity to be disposed of but also its complexity, as well as its hazardous nature. Dumping these kinds of polluted wastes into the environment at uncontrolled rates are putting increasing pressure on freshwater ecosystems. This review paper focuses on combined electrochemical degradation and biopolymer adsorption treatment processes and techniques for toxic compounds in pharmaceutical wastewater treatment. These emerging processes such as the combination of electrochemical techniques as a primary treatment method, followed by an adsorption process, is now a topic of intense research as it is proving to very feasible, ecofriendly, and cost-effective in the complete recovery of toxic residual solvents from binary aquatic systems. This paper presents major toxic pollutants in pharmaceutical wastewaters and their fate in the aquatic environment, their sources, and origin in pharmaceutical industries. The evaluation of the traditional methods used for the removal of these emerging organic pollutants from aquatic matrices and pharmaceutical effluents is accomplished. New developments in electrochemical treatments for the remediation of toxic compounds in pharmaceutical wastewaters are also discussed.

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Recent electrochemical methods in electrochemical degradation of halogenated organics: a review

Cited by 85 publications

References 257 publications

A 2.5D Electrode System Constructed of Magnetic Sb–SnO2 Particles and a PbO2 Electrode and Its Electrocatalysis Application on Acid Red G Degradation

A 2.5D Electrode System Constructed of Magnetic Sb–SnO2 Particles and a PbO2 Electrode and Its Electrocatalysis Application on Acid Red G Degradation

Insights into Electroreductive Dehalogenation Mechanisms of Chlorinated Environmental Pollutants

A Review on Electrochemical Degradation and Biopolymer Adsorption Treatments for Toxic Compounds in Pharmaceutical Effluents

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