Electrochemical oxidation of butyl paraben on boron doped diamond in environmental matrices and comparison with sulfate radical-AOP

Pueyo, N.; Ormad, María P.; Miguel, Natividad; Kokkinos, Petros; Ioannidi, Alexandra; Mantzavinos, Dionissios; Frontistis, Zacharias

doi:10.1016/j.jenvman.2020.110783

Cited by 28 publications

(15 citation statements)

References 57 publications

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“…Nevertheless, to ensure the pH modification is not responsible for this amelioration, an AO test was done at pH 3, where slight differences were detected (Table 5). Similar results about the minor effect of initial pH on the oxidation of organic pollutants using BDD oxidation have been previously reported [44,45]. Moreover, an initial EF test at neutral pH was carried out, improving slightly the mineralization performance when compared to AO.…”

Section: Ef Treatmentsupporting

confidence: 85%

Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride

et al. 2020

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This research proposes the application of iron-loaded sepiolite (S-Fe) as a catalytic adsorbent for the unreported 1-butylpyridinium chloride ([bpy] Cl) treatment in an aqueous medium. Initially, sepiolite was selected as an inexpensive and efficacious adsorbent for [bpy] Cl elimination. After that, sepiolite was loaded with iron for the subsequent electro-Fenton (EF) regeneration treatment. Once kinetic and isotherm studies were performed, providing respectively almost instantaneous adsorption (20 min) and an uptake of 22.85 mg/g, [bpy] Cl adsorption onto S-Fe was studied in continuous mode. The obtained breakthrough curve was analyzed using three standard breakthrough models, being Yoon–Nelson and Thomas the most suitable adjustments. Afterwards, S-Fe regeneration by the EF process was conducted using this iron-loaded silicate material as a heterogeneous catalyst. Under optimized operational conditions (current intensity 300 mA and Na2SO4 0.3 M), complete adsorbent regeneration was achieved in 10 h. The total mineralization of [bpy] Cl was reached within 24 h and among seven carboxylic acids detected, oxalic and acetic acids seem to be the primary carboxylic acids produced by [bpy] Cl degradation. Finally, S-Fe was efficiently used in four consecutive adsorption–regeneration cycles without a noticeable reduction in its adsorption capacity, opening a path for future uses.

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Section: Ef Treatmentsupporting

confidence: 85%

Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride

et al. 2020

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“…reported that the rate of BDD oxidation of parabens decreased at greater concentrations. In other studies, Pueyo et al 27 . studied the influence of butyl paraben concentration on its degradation at 50 mA cm −2 , and showed that complete degradation could be reached after 15 min of reaction in the range 0.25–1 mg L −1 with the rate constant decreasing from 0.35 to 0.12 min −1 , respectively.…”

Section: Resultsmentioning

confidence: 95%

“…Although the respective individual interactions cannot easily be identified and quantified, it seems that the role of chloride is critical, increasing the reaction rate by an order of magnitude in those experiments where UPW had 50–250 mg L −1 chloride added. This may be ascribed to the formation of active chlorine species according to Eqns (1)–(4) that complement hydroxyl radicals in the degradation of DEX: 24

2 {Cl}^{-} \to {Cl}_{2} + 2 e^{-}

{Cl}^{-} \to Cl ˙ + 2 e^{-}

{Cl}^{-} + {OH}^{∙} \to HOCl + e^{-}

HOCl \to {ClO}^{-} + H^{+}

The beneficial role of Cl − in the kinetics of electrochemical oxidation of organics has been demonstrated before 23,24,27 . However, it should be noted that the presence of chloride may cause the production of organochlorinated by‐products, which may be implicated in increased ecotoxicity 28,29 .…”

Section: Resultsmentioning

confidence: 99%

Degradation of dexamethasone in water using BDD anodic oxidation and persulfate: reaction kinetics and pathways

Grilla

Taheri

Miserli

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND The presence of micro‐pollutants in conventional wastewater treatment plants raises environmental concerns due to their insufficient removal. Non‐biological methods are needed to treat such compounds and this work demonstrates the use of electrochemical oxidation for the degradation of the drug dexamethasone (DEX). RESULTS A cell consisting of a boron‐doped diamond anode and a stainless steel or carbon cloth cathode was employed, with Na2SO4 being the electrolyte. DEX degradation rate, at the low level of mg L−1 (0.25–2 mg L−1), increases with increasing current (0.02–0.2 A m−2), as well as in the presence of sodium persulfate (50–250 mg L−1); the latter is electrochemically activated to produce additional oxidants and enhances degradation in a synergistic way. A rate constant of 0.194 min−1 was recorded for 0.5 mg L−1 DEX degradation at 0.2 A m−2 with 150 mg L−1 persulfate. The water matrix had little effect on performance compared to experiments in pure water; the only exception was the presence of chloride (50–250 mg L−1), which substantially improved rates due to the formation of active chlorine species (up to about five times). Carbon cloth accelerated DEX removal by up to three times compared to stainless steel and this was partly due to its adsorptive capacity; similarly, reactions involving DEX transformation products (TPs) also occurred faster. Seven TPs were identified and profiles were followed; reaction pathways involve hydroxylation, oxidation, decarboxylation and ring‐opening reactions, followed by fluorine release in the liquid phase. CONCLUSION A hybrid technology based on electrochemical oxidation and persulfate activation is proposed for the treatment of residual pharmaceuticals in environmental matrices. © 2021 Society of Chemical Industry (SCI).

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“…In this condition, 95% of BuP was degraded in 180 min in the presence of 0.1 M of K 4 P 2 O 7 as electrolyte and 40 µM of CTAC on glassy carbon. The study by Pueyo et al [114] proved the good performance of BDD over platinum and stainless-steel anodes. This should be expected, since one of the good characteristics of BDD is its good working performance, but the disadvantages such as its high cost can make it difficult to implement electrochemical experiments with this anode.…”

Section: Electrochemical Technologiesmentioning

confidence: 98%

“…The removal of BuP by electrochemical technologies was also investigated. Pueyo et al [114] used electrochemical oxidation, using different materials as anode and stainless-steel as cathode, to remove 0.5 mg/L of BuP in an electrolyte solution of 0.1 M of Na 2 SO 4 . BDD anode allowed a BuP removal of 100% in 15 min, while stainless steel and platinum only achieved 40% and 18% degradation, respectively.…”

Section: Electrochemical Technologiesmentioning

confidence: 99%

Paraben Compounds—Part II: An Overview of Advanced Oxidation Processes for Their Degradation

2021

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Water scarcity represents a problem for billions of people and is expected to get worse in the future. To guarantee people’s water needs, the use of “first-hand water” or the reuse of wastewater must be done. Wastewater treatment and reuse are favorable for this purpose, since first-hand water is scarce and the economic needs for the exploration of this type of water are increasing. In wastewater treatment, it is important to remove contaminants of emerging concern, as well as pathogenic agents. Parabens are used in daily products as preservatives and are detected in different water sources. These compounds are related to different human health problems due to their endocrine-disrupting behavior, as well as several problems in animals. Thus, their removal from water streams is essential to achieve safe reusable water. Advanced Oxidation Processes (AOPs) are considered very promising technologies for wastewater treatment and can be used as alternatives or as complements of the conventional wastewater treatments that are inefficient in the removal of such contaminants. Different AOP technologies such as ozonation, catalytic ozonation, photocatalytic ozonation, Fenton’s, and photocatalysis, among others, have already been used for parabens abatement. This manuscript critically overviews several AOP technologies used in parabens abatement. These treatments were evaluated in terms of ecotoxicological assessment since the resulting by-products of parabens abatement can be more toxic than the parent compounds. The economic aspect was also analyzed to evaluate and compare the considered technologies.

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Electrochemical oxidation of butyl paraben on boron doped diamond in environmental matrices and comparison with sulfate radical-AOP

Cited by 28 publications

References 57 publications

Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride

Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride

Degradation of dexamethasone in water using BDD anodic oxidation and persulfate: reaction kinetics and pathways

Paraben Compounds—Part II: An Overview of Advanced Oxidation Processes for Their Degradation

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