Synergistic degradation of GenX (hexafluoropropylene oxide dimer acid) by pairing graphene-coated Ni-foam and boron doped diamond electrodes

Olvera‐Vargas, Hugo; Wang, Zuxin; Xu, Jianxiong; Lefebvre, Olivier

doi:10.1016/j.cej.2021.132686

Cited by 39 publications

(7 citation statements)

References 60 publications

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“…It is reported that the kinetics controlled the process in lower densities, whereas the mass transport influenced the higher densities [87]. The degradation rate of PFOA onto ceramic/PbO2-PTFE anode was observed about nine times higher at 3.0 V (vs Ag/AgCl) compared to 2.5 V, whereas negligible values were reported at 1.5 and 2.0 V [90].…”

Section: Electrode Potential Current and Compositionmentioning

confidence: 96%

“…The detailed EPR analysis of CS modified bismuth phosphate confirms the better intensity of O2•in the composite has synergized the adsorption and corresponding photo-degradation. A two route mechanism was observed for graphene-Ni foam paired with boron-doped diamond electrodes in Electro-Fenton (EF) treatment [87].…”

Section: Degradation Mechanism and Pathwaysmentioning

confidence: 99%

“…Electrochemical-reductive (ER) and Electro-Fenton (EF) treatments are another kind of remediation technique considering the ease of operation and mild reaction kinetics [86] Electro-Fenton (EF) degradation/mineralization was recently reported towards GenX (i.e., Hexafluoropropylene oxide dimer acid) using a graphene-Ni foam (cathode) paired with borondoped diamond (BDD) electrodes (anode) [87]. EF mechanism is a popular electrochemical advanced oxidation process based on the production of •OH radicals and H2O2, whereas it received limited reactivity while dealing with PFASs (Kabs ≤ 10 The possible application of fluorocarbon constituents in degrading PFASs was also observed recently.…”

Section: Other Metal/metalloid Based Electrodesmentioning

confidence: 99%

“…The corresponding lower Mulliken charges (low-electron transfer) and higher adsorption energies (strong sorption) for Ti centres in Ti4O7 over Ti9O17 resulted in better degradation. Boron doped diamond (BDD) anode showed better degradation of GenX by pairing graphene-coated Ni-foam cathode with respect to Pt, and fluorine-doped tin oxide (FTO) anodes due to superior charge transfer and electrochemical abilities [87]. The presence of graphene in the TiO2/FTO anodes was observed with the enhancement in the PFOA degradation efficiency (0.0134 min -1 ) compared to the pristine anode (0.0109 min -1 ) [65].…”

Section: Electrode Potential Current and Compositionmentioning

confidence: 99%

“…[87].PFOA degradation efficiencies onto an Rh/Ni electrode (i.e., Rh 3+ -Ni foil) were observed as50.4 %, 44.8 %, and 18.0 % in dimethylformamide (DMF), acetonitrile (ACN), and tetrahydrofuran (THF) solvents in ER, respectively. The difference in the ionic conductivity parameters of the individual systems DMF is 4.0 S⋅cm −1 , ACN (3.7 S⋅cm −1 ), and THF (2.4 S⋅cm −1 ) [25 ℃] has resulted in different degradation efficiencies.…”

mentioning

confidence: 99%

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Per-/Poly-fluoroalkyl Substances (PFASs) Treatment and Mechanistic Insights: Photo-catalyst and Photo-Electro-catalyst Materials Application

Penke

Kar

2022

Preprint

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The PFASs contamination (Per-/Poly-fluoroalkyl Substances ~ 4000 compounds) is influencing the humane through soil and aquifers contamination, resulting in the endocrine-disrupting symptoms (EDS). PFASs decontamination involves both (i) Capture/non-degradation techniques and (ii) Degradation techniques. In the present work, a detailed discussion on various photo-catalytic/electrocatalytic electrode materials (Fe/Ti/Zn/Bi/C etc.) over PFASs degradation is provided. The authors have focused onto the recent literature published in the last couple of years for citing research outputs and schematic figures. The analysis of both radical species (e.g., hydroxyl/sulphate species) and direct electron transfer (DET) mechanisms are given. An insightful discussion of the impact on various degradation mechanisms (decarboxylation, and hydrodefluorination) onto various PFASs has been provided. A different set of examples are provided in describing both electron (e-) based oxidation and hole (h+) based oxidation phenomenon. The state-of-the-art novel inventions towards pilot-scale studies and field-level applications are discussed with explaining the possible limitations (e.g., light source etc.). The factors influencing the degradation process (i.e., Electrode potential, Current density, Impact of dosage, pH, Radical species, Competing ions, Temperature and light source) are also detailed prior to the future perspective and conclusions.

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Section: Electrode Potential Current and Compositionmentioning

confidence: 96%

Section: Degradation Mechanism and Pathwaysmentioning

confidence: 99%