Electrochemical degradation of 5-FU using a flow reactor with BDD electrode: Comparison of two electrochemical systems

Ochoa-Chavez, Stalin Andres; Pieczyńska, Aleksandra; Borzyszkowska, Agnieszka Fiszka; Espinoza-Montero, Patricio J.

doi:10.1016/j.chemosphere.2018.03.050

Cited by 26 publications

(13 citation statements)

References 44 publications

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“…The concentrations of pharmaceuticals were much higher than that found in the waterbodies, due to minimizing the error in the analysis of inorganic ions released and the intermediates of the drugs oxidation process. The operating parameters: volumetric flow rate (13 L·h −1 ) and current density (150 Am −2 (j app > j lim )), were previously experimentally selected [20]. The experimental data were well described by pseudo-first-order rate kinetics (R 2 in range 0.95–0.99).…”

Section: Resultsmentioning

confidence: 99%

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Insights into Mechanisms of Electrochemical Drug Degradation in Their Mixtures in the Split-Flow Reactor

et al. 2019

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The recirculating split-flow batch reactor with a cell divided into anolyte and catholyte compartments for oxidation mixture of cytostatic drugs (CD) was tested. In this study, kinetics and mechanisms of electrochemical oxidization of two mixtures: 5-FU/CP and IF/CP were investigated. The order of the CD degradation rate in single drug solutions and in mixtures was found to be 5-FU < CP < IF. In the 5-FU/CP mixture, kapp of 5-FU increased, while kapp of CP decreased comparing to the single drug solutions. No effect on the degradation rate was found in the CP/IF mixture. The presence of a second drug in the 5-FU/CP mixture significantly altered mineralization and nitrogen removal efficiency, while these processes were inhibited in IF/CP. The experiments in the different electrolytes showed that •OH and sulphate active species can participate in the drug’s degradation. The kapp of the drugs was accelerated by the presence of Cl− ions in the solution. Chlorine active species played the main role in the production of gaseous nitrogen products and increased the mineralisation. Good results were obtained for the degradation and mineralisation processes in mixtures of drugs in municipal wastewater-treated effluent, which is beneficial from the technological and practical point of view.

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Section: Resultsmentioning

confidence: 99%

“…All experiments were performed in duplicate. The optimal experimental conditions were previously investigated [20]. Electrochemical degradation of the mixtures (IF/CP and CP/5-FU) in the supported electrolyte solution (42 mM Na 2 SO 4 or 42mM NaNO 3 ) was carried out for the initial drug concentration of 25 mg·L −1 .…”

Section: Methodsmentioning

confidence: 99%

Insights into Mechanisms of Electrochemical Drug Degradation in Their Mixtures in the Split-Flow Reactor

et al. 2019

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“…On the contrary, persulfate, percarbonate and perphosphate (Reaction 16-18) are efficiently generated only using anodes with high oxygen evolution overpotential, such as boron-doped diamond (BDD) or lead dioxide (PbO 2 ), especially when oxygen is produced as a secondary reaction. The presence of those strong oxidants in wastewater bulk avoids mass-transfer limitation and increases process efficiency [83][84][85][86]. In summary, Figure 4 presents the electrochemical oxidation mechanism of glyphosate in an aqueous medium.…”

Section: Electrochemical Oxidation Processmentioning

confidence: 99%

“…in wastewater bulk avoids mass-transfer limitation and increases process efficiency [83][84][85][86]. In summary, Figure 4 presents the electrochemical oxidation mechanism of glyphosate in an aqueous medium.…”

Section: Electrochemical Oxidation Processmentioning

confidence: 99%

Technologies Employed in the Treatment of Water Contaminated with Glyphosate: A Review

et al. 2020

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Glyphosate [N-(phosphonomethyl)-glycine] is a herbicide with several commercial formulations that are used generally in agriculture for the control of various weeds. It is the most used pesticide in the world and comprises multiple constituents (coadjutants, salts, and others) that help to effectively reach the action’s mechanism in plants. Due to its extensive and inadequate use, this herbicide has been frequently detected in water, principally in surface and groundwater nearest to agricultural areas. Its presence in the aquatic environment poses chronic and remote hazards to human health and the environment. Therefore, it becomes necessary to develop treatment processes to remediate aquatic environments polluted with glyphosate, its metabolites, and/or coadjutants. This review is focused on conventional and non-conventional water treatment processes developed for water polluted with glyphosate herbicide; it describes the fundamental mechanism of water treatment processes and their applications are summarized. It addressed biological processes (bacterial and fungi degradation), physicochemical processes (adsorption, membrane filtration), advanced oxidation processes—AOPs (photocatalysis, electrochemical oxidation, photo-electrocatalysis, among others) and combined water treatment processes. Finally, the main operating parameters and the effectiveness of treatment processes are analyzed, ending with an analysis of the challenges in this field of research.

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“…[21][22][23] In this sense, high O 2 -overvoltage anodes such as borondoped diamond (BDD) electrodes have received close attention due to the important physical and chemical characteristics of this material, including a low enthalpy of adsorption, low double-layer capacitance, high stability to corrosion and high percentage of mineralization or the transformation to CO 2 for a wide range of organic compounds. [24][25][26] This property is related to the generation of the hydroxyl radical ( * OH), the most oxidizing free radical, which has a high standard reduction potential (2.8 V vs SHE). [27] This radical is generated on the BDD surface during the electrolysis of water at high overpotentials according to Eq.…”

Section: Introductionmentioning

confidence: 99%

Effect of the sp³/sp² Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation

et al. 2019

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The sp3/sp2 ratio present in boron‐doped diamond (BDD) electrodes conditions the way in which organic compounds are oxidized and transformed to CO2 during anodic oxidation. A higher content of sp3 carbon on the surface favors the generation of hydroxyl radicals over the oxygen evolution reaction, which generates different degradation byproducts. In this work, we studied the degradation of aniline by anodic oxidation using five BDD electrodes with different sp3/sp2 ratios in sulfate and chloride media. Aniline was degraded using the five BDD electrodes in both electrolytes, and clear differences were observed in the intermediates produced during the electrolysis. BDD electrodes with higher sp3 proportions allowed for greater degradation and mineralization of aniline with lower molecular weight and the production of fewer toxic organic byproducts. Degradation pathways for aniline in sulfate and chloride media are proposed, evidencing the differences in the oxidation mechanisms for aniline and its byproducts due to the varying sp3/sp2 ratio in the BDD electrodes.

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Electrochemical degradation of 5-FU using a flow reactor with BDD electrode: Comparison of two electrochemical systems

Cited by 26 publications

References 44 publications

Insights into Mechanisms of Electrochemical Drug Degradation in Their Mixtures in the Split-Flow Reactor

Insights into Mechanisms of Electrochemical Drug Degradation in Their Mixtures in the Split-Flow Reactor

Technologies Employed in the Treatment of Water Contaminated with Glyphosate: A Review

Effect of the sp³/sp² Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation

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Electrochemical degradation of 5-FU using a flow reactor with BDD electrode: Comparison of two electrochemical systems

Cited by 26 publications

References 44 publications

Insights into Mechanisms of Electrochemical Drug Degradation in Their Mixtures in the Split-Flow Reactor

Insights into Mechanisms of Electrochemical Drug Degradation in Their Mixtures in the Split-Flow Reactor

Technologies Employed in the Treatment of Water Contaminated with Glyphosate: A Review

Effect of the sp3/sp2 Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation

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Effect of the sp³/sp² Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation