Insights into the Kinetics of Intermediate Formation during Electrochemical Oxidation of the Organic Model Pollutant Salicylic Acid in Chloride Electrolyte

Ambauen, Noëmi; Muff, Jens; Lan, Ngoc; Hallé, Cynthia; Trinh, Thuat T.; Meyn, Thomas

doi:10.3390/w11071322

Cited by 11 publications

(6 citation statements)

References 35 publications

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“…2b) in the LL, whereas in the clean electrolyte BPA degradation started immediately. In clean electrolyte, active chlorine is formed at slower rates on Pt anodes than on BDD anodes [25]. The LL contains inorganic anions like Cl − and bicarbonate, which can act as hydroxyl radical scavengers.…”

Section: Removal Of Bisphenol Amentioning

confidence: 99%

Electrochemical removal of Bisphenol A from landfill leachate under Nordic climate conditions

et al. 2020

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This study investigated the applicability of electrochemical oxidation for landfill leachate treatment in climate areas, where cold temperatures prevail (like Northern Norway). Experiments were completed with pre-treated (coagulation/flocculation and separation) landfill leachate at 6 and 20 °C in order to assess the temperature influence on the degradation of the organic pollutant Bisphenol A and the fate of the ordinary wastewater parameters COD and nitrate. Furthermore, two different anode materials (Ti/Pt and Nb/BDD) and three different current densities (10, 43 and 86 mA cm−2) were compared. Additionally, the formation of the two groups of disinfection by-products, trihalomethanes and perchlorate, was monitored. A 99% removal of Bisphenol A was confirmed at 6 °C on both tested anode materials, but a current density of at least 43 mA cm−2 must be applied. Removal rates were on average 38% slower at 6 °C than at 20 °C. For comparison, Bisphenol A removal in clean electrolyte disclosed faster degradation rates (between 50 and 68%) due to absent landfill leachate matrix effects. The energy consumption for 99% Bisphenol A removal was 0.28 to 1.30 kWh m−3, and was on average 14% higher at 6 °C compared to 20 °C. Trihalomethanes were mainly formed on Pt anodes in the ppb range, while perchlorate was primarily formed at BDD anodes in the ppm range. Formation of disinfection by-products increased with increased applied current and temperature. Electrochemical oxidation was found to be a suitable treatment process for landfill leachate in cold climate areas by successfully meeting treatment goals. Graphic abstract

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Section: Removal Of Bisphenol Amentioning

confidence: 99%

Electrochemical removal of Bisphenol A from landfill leachate under Nordic climate conditions

et al. 2020

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“…The Special Issue consists of nine papers describing a wide spectrum of research related to the removal of environmentally significant pollutants from aqueous samples and their determination in various matrices. The presented articles can be classified into three broad thematic sectors related to the topic of the special issue: new methods of isolation and determination of compounds from the EOCs group [22][23][24], occurrence of EOCs in the water environment [24,25], and new approaches to the degradation of significant water pollutants or their removal [26][27][28][29][30].…”

Section: Overview Of the Special Issuementioning

confidence: 99%

“…The research conducted shows that the proposed microorganisms can be successfully used to remove platinum and palladium from contaminated waters and industrial waste. Ambauen et al [27] investigated electrochemical oxidation of the organic model pollutant salicylic acid. Two anode materials, platinum and boron doped diamond, were used along with chloride and sulfate electrolytes.…”

Section: New Approaches To Degradation Of Water Pollutantsmentioning

confidence: 99%

“…Its efficiency strongly depends on the presence of electron and hole scavengers and the chemical properties of adsorbed organic compounds. The above articles [27][28][29] concern the application of chemical processes for removal of organic pollutants. Another approach to wastewater cleaning was proposed by Mendoza et al [30].…”

Section: New Approaches To Degradation Of Water Pollutantsmentioning

confidence: 99%

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Removal of Organic Pollution in the Water Environment

Karpińska

Kotowska

2019

Water

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The development of civilization entails a growing demand for consumer goods. A side effect of the production and use of these materials is the production of solid waste and wastewater. Municipal and industrial wastewater usually contain a large amount of various organic compounds and are the main source of pollution of the aquatic environment with these substances. Therefore, the search for effective methods of wastewater and other polluted water treatment is an important element of caring for the natural environment. This Special Issue contains nine peer-review articles presenting research on the determination and removal of environmentally hazardous organic compounds from aqueous samples. The presented articles were categorized into three major fields: new approaches to the degradation of water pollutants, new methods of isolation and determination of the emerging organic contaminants (EOCs), and the occurrence of EOCs in the water environment. These articles present only selected issues from a very wide area, which is the removal of organic pollution in water environment, but can serve as important references for future studies.

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“…Moreover, comparative studies in electrodes combinations were described: Yoon et al (2012) reported a flow reactor for the electrochemical degradation of phenol and 2-chlorophenol using Pt/Ti and BDD electrodes, as well as Ambauen et al (2019) comprised a electrochemical oxidation batch reactor for salicylic acid degradation with BDD and Pt electrodes. In both studies similar removal rates in the different electrodes combinations were attained, showing that not only the electrodes type highly influence the compounds degradation efficiencies, but also the physicochemical characteristics of the contaminants to be degraded.…”

Section: Introductionmentioning

confidence: 99%

Emerging organic contaminants in wastewater: Understanding electrochemical reactors for triclosan and its by-products degradation

et al. 2020

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Degradation technologies applied to emerging organic contaminants from human activities are one of the major water challenges in the contamination legacy. Triclosan is an emerging contaminant, commonly used as antibacterial agent in personal care products. Triclosan is stable, lipophilic and it is proved to have ecotoxicology effects in organics. This induces great concern since its elimination in wastewater treatment plants is not efficient and its by-products (e.g. methyl-triclosan, 2,4dichlorophenol or 2,4,6-trichlorophenol) are even more hazardous to several environmental compartments. This work provides understanding of two different electrochemical reactors for the degradation of triclosan and its derivative by-products in effluent. A batch reactor and a flow reactor (mimicking a secondary settling tank in a wastewater treatment plant) were tested with two different working anodes: Ti/MMO and Nb/BDD. The degradation efficiency and kinetics were evaluated to find the best combination of current density, electrodes and set-up design. For both reactors the best electrode combination was achieved with Ti/MMO as anode. The batch reactor at 7 mA/cm2 during 4 h attained degradation rates below the detection limit for triclosan and 2,4,6-trichlorophenol and, 94% and 43% for 2,4-dichlorophenol and methyl triclosan, respectively. The flow reactor obtained, in approximately 1 h, degradation efficiencies between 41% and 87% for the four contaminants under study. This study suggests an alternative technology for emergent organic contaminants degradation, since the combination of a low current density with the flow and matrix induced disturbance increases and speeds up the compounds' elimination in a real environmental matrix.

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Insights into the Kinetics of Intermediate Formation during Electrochemical Oxidation of the Organic Model Pollutant Salicylic Acid in Chloride Electrolyte

Cited by 11 publications

References 35 publications

Electrochemical removal of Bisphenol A from landfill leachate under Nordic climate conditions

Electrochemical removal of Bisphenol A from landfill leachate under Nordic climate conditions

Removal of Organic Pollution in the Water Environment

Emerging organic contaminants in wastewater: Understanding electrochemical reactors for triclosan and its by-products degradation

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