Electrochemical Treatments for the Removal of Emerging Contaminants

Malinović, Borislav N.; Markelj, Jernej; Prosen, Helena; Gotvajn, Andreja Žgajnar; Cigić, Irena Kralj

doi:10.1007/978-3-030-69090-8_2

Cited by 3 publications

(4 citation statements)

References 256 publications

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“…high oxygen evolution overpotential, such as boron-doped diamond -BDD). 10,11 MMO anodes are made by coating a substrate, such as titanium, with several types of metal oxides (RuO 2 , IrO 2 or PtO 2 ). BDD electrodes are the preferred anode materials due to their high removal efficiency and long-term stability, in spite of higher cost.…”

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confidence: 99%

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Electrooxidation of Phenol on Boron-doped Diamond and Mixed-metal Oxide Anodes: Process Evaluation, Transformation By-products, and Ecotoxicity

Đuričić

Prosen

Kravos

et al. 2023

J. Electrochem. Soc.

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Phenolic pollutants raise health and environmental concerns due to their widespread occurrence in industrial wastewaters. Electrooxidation was studied for phenol degradation in different supporting electrolytes: NaCl, Na2SO4, H2SO4. Experiments were performed at constant current density 20 mA/cm2. Two anode materials were tested, boron-doped diamond (BDD) and mixed-metal oxide (MMO). Degradation process and its impact was investigated from technological, analytical, and ecotoxicological viewpoints. Removal efficiency was monitored by phenol index spectrophotometric method and phenol removal quantified with HPLC-DAD. Additionally, transformation by-products were tracked with GC-MS and LC-MS, as well as ion chromatography. Finally, ecotoxicity was investigated using Daphnia magna. Electrooxidation was efficient and had low energy consumption. The use of BDD anode led to higher removal efficiencies and induced more progressive degradation to simple organic acids, compared to MMO. Selection of electrolyte affected degradation pathways and detoxification pattern. Treatment by BDD in NaCl led to complete phenol removal in 30 min, but undesired chlorinated aromatic by-products were formed. Treatment in sulphate medium led to slower processes irrespective of pH, but less problematic by-products with minimal ecotoxicological impact emerged. By using multi-aspect methodology, this study reevaluates phenol electrooxidative degradation and contributes to better understanding of electrooxidation performance in water treatment.

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confidence: 99%

“…Additionally, they can also generate strong oxidizing agents, such as active chlorine species from chloride. 11 The latter is often used as supporting electrolyte for phenol degradation. 17,18 However, this may also lead to the generation of toxic organochlorinated species that have been reported as by-products such as chlorophenols.…”

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confidence: 99%

Electrooxidation of Phenol on Boron-doped Diamond and Mixed-metal Oxide Anodes: Process Evaluation, Transformation By-products, and Ecotoxicity

Đuričić

Prosen

Kravos

et al. 2023

J. Electrochem. Soc.

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“…EO is used to remove contaminants from wastewater because it has significant advantages, is ecofriendly and based on the in situ production of the hydroxyl radical as strong oxidation agent. For EO treatment most important parameter is selection of anode material which can be "active" (low oxygen evolution overpotential, e.g., mixed-metal oxide -MMO) and "inactive" electrodes (high oxygen evolution overpotential, e.g., boron doped diamond -BDD) and which determine the mechanism of electrooxidation (De Battisti and Martínez-Huitle 2018; Malinović et al 2021). MMO anodes are made by coating a substrate, such as titanium, with several types of metal oxides (RuO2, IrO2 or PtO2).…”

Section: Introductionmentioning

confidence: 99%

“…Supporting electrolytes have a primary role to provide good conductivity of wastewater, and at the same time reduce energy consumption. They can also provide strong oxidizing agents by electrogeneration, such as active chlorine species (Malinović et al 2021).…”

Section: Introductionmentioning

confidence: 99%

A comparison of electrooxidation of phenol on boron doped diamond and mixed metal oxide anodes

Malinović¹,

Djuricic²,

Prosen³

et al.

Global NEST International Conference on Environmental Science &Amp; Technology

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Phenolic compounds are widespread in wastewater from various industries. Since the phenols are potentially carcinogenic for humans and hazardous for the environment, their presence in wastewater raises concerns. In this paper electrooxidation process was used for treatment of synthetical prepared wastewater containing phenol. Initial phenol concentration in wastewater was 50 mg/L with addition of different supporting electrolytes (NaCl, Na2SO4, H2SO4). The treatment was performed in a batch electrochemical reactor at constant current density of 20 mA/cm2. Boron doped diamond (BDD) and mixed metal oxide (MMO) anode materials were examined, and stainless steel was used as cathode. Phenol concentration before and after treatment was determined by standard spectrophotometric method with 4-aminoantipyrine, while transformation products were identified by different chromatographic methods. Experiments have shown that the treatment is very efficient and with low energy consumption, wherein the phenol removal efficiency mostly depends on the duration of treatment and the type of supporting electrolyte.

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Electrochemical treatment of wastewater to remove contaminants from the production and disposal of plastics: a review

et al. 2022

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Wastewater is major source of contaminants originating from the production, usage, and disposal of plastic materials. Due to their poor biodegradability of these contaminants in municipal wastewater treatment plants, additional advanced oxidation processes such as electrochemical treatments have been developed to improve the standard biological treatment. Here we review the applications of electrochemical treatments of wastewater for the removal of the following plastic contaminants: bisphenol A, phthalic acid esters, and benzotriazoles. We present the effectiveness of treatment in terms of contaminant removal and mineralization; the identification of transformation products; toxicity assessment; and process energy requirements. In the present review, we have focused on the applications of electrochemical treatments of wastewater for the removal of three important groups of contaminants originating mainly from plastics: bisphenol A, phthalic acid esters, and benzotriazoles. The review focuses on the research of electrochemical treatments for these contaminants from the last five years. The papers are assessed from the point of i) effectiveness of treatment in terms of contaminant removal and mineralization; ii) identification of transformation products; iii) toxicity assessment; iv) processes’ energy requirements. Electrochemical treatments were confirmed to be a viable option for the removal of selected contaminants from wastewater.

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Electrochemical Treatments for the Removal of Emerging Contaminants

Cited by 3 publications

References 256 publications

Electrooxidation of Phenol on Boron-doped Diamond and Mixed-metal Oxide Anodes: Process Evaluation, Transformation By-products, and Ecotoxicity

Electrooxidation of Phenol on Boron-doped Diamond and Mixed-metal Oxide Anodes: Process Evaluation, Transformation By-products, and Ecotoxicity

A comparison of electrooxidation of phenol on boron doped diamond and mixed metal oxide anodes

Electrochemical treatment of wastewater to remove contaminants from the production and disposal of plastics: a review

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