Boron doped diamond electrooxidation of 6:2 fluorotelomers and perfluorocarboxylic acids. Application to industrial wastewaters treatment

Gómez-Ruiz, Beatriz; Gómez-Lavín, Sonia; Diban, Nazely; Boiteux, Virginie; Colin, Adeline; Dauchy, Xavier; Urtiaga, Ane

doi:10.1016/j.jelechem.2017.05.033

Cited by 36 publications

(12 citation statements)

References 40 publications

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“…Shorter chain PFPeA and PFBA are formed upon the loss of successive CF 2 units in consecutive steps (Gomez-Ruiz et al, 2017b;Schaefer et al, 2017). The results of analyzed PFASs also explains the faster kinetics of 6:2 FTSA disappearance compared to the TOC removal rate, related to the extra energy needed for the degradation of PFCAs obtained as secondary products.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 79%

BDD anodic treatment of 6:2 fluorotelomer sulfonate (6:2 FTSA). Evaluation of operating variables and by-product formation

2018

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The concerns about the undesired impacts on human health and the environment of long chain perfluorinated alkyl substances (PFASs) have driven industrial initiatives to replace PFASs by shorter chain fluorinated homologues. 6:2 fluorotelomer sulfonic acid (6:2 FTSA) is applied as alternative to PFOS in metal plating and fluoropolymer manufacture. This study reports the electrochemical treatment of aqueous 6:2 FTSA solutions on microcrystalline BDD anodes. Bench scale batch experiments were performed, focused on assessing the effect of the electrolyte and the applied current density (5-600 A m) on the removal of 6:2 FTSA, the reduction of total organic carbon (TOC) and the fluoride release. Results showed that at the low range of applied current density (J = 50 A m), using NaCl, NaSO and NaClO, the electrolyte exerted a minimal effect on removal rates. The formation of toxic inorganic chlorine species such as ClO was not observed. When using NaSO electrolyte, increasing the applied current density to 350-600 A m promoted a notable enhancement of the 6:2 FTSA removal and defluorination rates, pointing to the positive contribution of electrogenerated secondary oxidants to the overall removal rate. 6:2 FTSA was transformed into shorter-chain PFCAs, and eventually into CO and fluoride, as TOC reduction was >90%. Finally, it was demonstrated that diffusion in the liquid phase was controlling the overall kinetic rate, although with moderate improvements due to secondary oxidants at very high current densities.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 79%

BDD anodic treatment of 6:2 fluorotelomer sulfonate (6:2 FTSA). Evaluation of operating variables and by-product formation

2018

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“…The electrode material is one of the most significant factors in the EOX process; thus, the development of novel electrode materials is a key factor to increase treatment efficiency. EOX can be used for treating different kinds of wastewaters, disinfecting drinking water, and degrading harmful target pollutants (Sirés & Brillas 2012;Brillas & Martínez-Huitle 2015;Gomez-Ruiz et al 2017a;Barısçı et al 2018aBarısçı et al , 2018bTurkay et al 2018;Barisci & Suri 2020;Barisci & Suri 2021). EOX involves two mechanisms that occur simultaneously during the oxidation of pollutants: (1) direct electron transfer to the anode surface, and (2) indirect oxidation with powerful reactive oxygen species (ROS) generated from water oxidation, such as hydroxyl radical or active oxygen (Sirés et al 2014;Brillas & Martínez-Huitle 2015;Schaefer et al 2015).…”

Section: Electrooxidationmentioning

confidence: 99%

Occurrence and removal of poly/perfluoroalkyl substances (PFAS) in municipal and industrial wastewater treatment plants

Barışçı

Suri

2021

Water Science and Technology

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The presence of poly- and perfluoroalkyl substances (PFAS) has caused serious problems for drinking water supplies especially at intake locations close to PFAS manufacturing facilities, wastewater treatment plants (WWTPs), and sites where PFAS-containing firefighting foam was regularly used. Although monitoring is increasing, knowledge on PFAS occurrences particularly in municipal and industrial effluents is still relatively low. Even though the production of C8-based PFAS has been phased out, they are still being detected at many WWTPs. Emerging PFAS such as GenX and F-53B are also beginning to be reported in aquatic environments. This paper presents a broad review and discussion on the occurrence of PFAS in municipal and industrial wastewater which appear to be their main sources. Carbon adsorption and ion exchange are currently used treatment technologies for PFAS removal. However, these methods have been reported to be ineffective for the removal of short-chain PFAS. Several pioneering treatment technologies, such as electrooxidation, ultrasound, and plasma have been reported for PFAS degradation. Nevertheless, in-depth research should be performed for the applicability of emerging technologies for real-world applications. This paper examines different technologies and helps to understand the research needs to improve the development of treatment processes for PFAS in wastewater streams.

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“…For remediation, high current and voltage are needed; limiting the availability of electrode materials. One of the most explored materials is boron‐doped diamond (BDD) (Carter and Farrell, 2008; Liao and Farrell, 2009; Lin et al ., 2013; Ochiai et al ., 2011a; 2011b; Xiao et al ., 2011; Zhuo et al ., 2012; Chaplin, 2014; Trautmann et al ., 2015; Urtiaga et al ., 2015; Niu et al ., 2016; Gomez‐Ruiz et al ., 2017; 2018; Schaefer et al ., 2017; Soriano et al ., 2017). BDD can withstand the high current and potential, while behaving as a weak absorber of hydroxyl radicals.…”

Section: Introductionmentioning

confidence: 99%

“…Various current densities, 0.04‐50 mA/cm 2 , have been explored using BDD anodes to degrade various fluorinated compounds (Carter and Farrell, 2008; Liao and Farrell, 2009; Ochiai et al ., 2011a; 2011b; Xiao et al ., 2011; Zhuo et al ., 2012; Trautmann et al ., 2015; Urtiaga et al ., 2015; Niu et al ., 2016; Gomez‐Ruiz et al ., 2017; Soriano et al ., 2017; Schaefer et al ., 2017; Gomez‐Ruiz et al ., 2018). For PFOA, literature shows that increasing the current density increases the degradation rate (Urtiaga et al ., 2015; Schaefer et al ., 2017).…”

Section: Introductionmentioning

confidence: 99%

A combined current density technique for the electrochemical oxidation of perfluorooctanoic acid (PFOA) with boron‐doped diamond

Ensch

Rusinek

Becker

et al. 2020

Water & Environment J

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Perfluoroalkyl substances (PFAS) have unique properties that limit their degradability in the environment. One of these PFAS is an acid (PFOA). Electrochemical oxidation is a promising method for remediation, but energy costs are high. To limit the energy consumption, this study used a boron‐doped diamond (BDD) electrode stack and a combined current density technique that employed 50 mA/cm2 for the first 0.25 hours then lowered the current density to 1, 5, or 10 mA/cm2. This technique is similar to one developed previously; however, that method was only developed for compounds comprising of carbon, oxygen and nitrogen, whereas PFAS have the addition of fluorine. For the degradation of PFOA, the combined current density of 50 and 5 mA/cm2 (50&5) allowed for a 37% reduction in energy usage to obtain 75% defluorination compared to using 50 mA/cm2 alone. Further investigation into remediating an ion‐exchange regeneration solution shows great promise.

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Boron doped diamond electrooxidation of 6:2 fluorotelomers and perfluorocarboxylic acids. Application to industrial wastewaters treatment

Abstract: Boron doped diamond electrooxidation of 6:2 fluorotelomers and perfluorocarboxylic acids. Application to industrial wastewaters treatment.

Cited by 36 publications

References 40 publications

BDD anodic treatment of 6:2 fluorotelomer sulfonate (6:2 FTSA). Evaluation of operating variables and by-product formation

BDD anodic treatment of 6:2 fluorotelomer sulfonate (6:2 FTSA). Evaluation of operating variables and by-product formation

Occurrence and removal of poly/perfluoroalkyl substances (PFAS) in municipal and industrial wastewater treatment plants

A combined current density technique for the electrochemical oxidation of perfluorooctanoic acid (PFOA) with boron‐doped diamond

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