Electrochemical oxidation of perfluorinated compounds in water

Niu, Junfeng; Li, Yang; Shang, Enxiang; Xu, Zesheng; Liu, Jinzi

doi:10.1016/j.chemosphere.2015.11.115

Cited by 196 publications

(98 citation statements)

References 94 publications

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“…However, the high cost of BDD electrodes and the energy required to the complete mineralization of organics hinder the implementation of this technology at full scale (Canizares et al 2009;Anglada et al 2011;Niu et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical wastewater treatment: influence of the type of carbon and of nitrogen on the organic load removal

Fernandes

Coelho

Ciríaco

et al. 2016

Environ Sci Pollut Res

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Boron-doped diamond (BDD) and Ti/Pt/PbO anodes were utilized to perform the electrodegradation of synthetic samples containing humic acid in the presence of different organic and inorganic carbon-containing and nitrogen-containing compounds. The influence of the chloride ion in the degradation process of the different synthetic samples was also assessed. The results showed that the anodic oxidation process can efficiently degrade recalcitrant compounds such as humic acid. The presence of carbonate in solution enhances the nitrogen removal, whereas it hinders the oxidation of the organic compounds. When organic nitrogen is present, it is converted to NH, which in turn is oxidized to nitrate and to volatile nitrogen compounds. Hydroxyl radicals are more prone to oxidize the organic nitrogen than the ammonium nitrogen. The presence of chloride enhances the organic matter and nitrogen removal rates, BDD being the anode material that yields the highest removals.

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Section: Introductionmentioning

confidence: 99%

Electrochemical wastewater treatment: influence of the type of carbon and of nitrogen on the organic load removal

Fernandes

Coelho

Ciríaco

et al. 2016

Environ Sci Pollut Res

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“…Most of the previous studies were focused on the selection of the anodic material. "Non-active" anodes such as SnO 2 , PbO 2 and boron doped diamond (BDD), provided high mineralization of PFOA and some perfluoroalkane sulfonic acids [24,[32][33][34][35]. The electrochemical efficiency of the anode material depends on its electron transfer ability, as well as on its hydroxyl radical (HO·) generation capacity.…”

Section: Introductionmentioning

confidence: 99%

Efficient electrochemical degradation of poly- and perfluoroalkyl substances (PFASs) from the effluents of an industrial wastewater treatment plant

Gómez-Ruiz

Gómez-Lavín

Diban

et al. 2017

Chemical Engineering Journal

136

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This paper reports the electrochemical treatment of poly-and perfluoroalkyl substances (PFASs) in the effluent from an industrial wastewater treatment plant (WWTP). While most of the previous research focused on the electrochemical degradation of perfluorooctanoic acid and perfluorooctane sulfonate in model solutions, this work studies the simultaneous removal of 8 PFASs at environmentally relevant concentrations in real industrial emissions, which also contained organic matter and inorganic anions. The overall PFASs content in the WWTP effluent was 1652 µg/L, which emphasized the need to develop innovative technologies for the management of PFASs emissions. 6:2 fluorotelomer sulfonamide alkylbetaine (6:2 FTAB) and 6:2 fluorotelomer sulfonate (6:2 FTSA) were the major contributors (92% w/w) to the overall PFASs content, that also contained significant amounts of short-chain perfluorocarboxylic acids (PFCAs). Using a boron doped diamond (BDD) anode of 0.0070 m 2 , the effluent (2 L) was treated by applying a current density of 50 mA/cm 2 for 10 hours, that resulted in 99.7% PFASs removal. The operation at lower current densities (5 and 10 mA/cm 2 ) evidenced the initial degradation of 6:2 fluorotelomers into perfluoroheptanoic and perfluorohexanoic acids, that were later degraded into shorter chain PFCAs. The high TOC removal, >90%, and the fluoride release revealed that PFASs mineralization was effective. These results highlight the potential of the electrochemical technology for the treatment of PFASs contained in industrial wastewaters, which nowadays stands as the main source of this group of persistent pollutants into the environment.

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“…This is due to the fact that the active sites and the amount of photons produced by the catalyst are constant with the same dosage of the catalyst, and the amount of photons obtained by the unit molecule decreases with the increase of initial concentration [13], which is not conducive to the process of photolysis. However, when the initial concentration of IBP is too high in the coexisting system, the possibility of bromate (with an excessively low initial concentration) approaching the surface of FGT was lower than that with higher initial concentrations [14], then leading to the lower removal rate [15]. Therefore, unless otherwise specified, the initial bromate and IBP concentrations of 100 μg/L were selected in this work.…”

Section: Initial Concentrationmentioning

confidence: 99%

Synergistic Removal of Bromate and Ibuprofen by Graphene Oxide and TiO₂ Heterostructure Doped with F: Performance and Mechanism

Zhang

Liu

2020

Journal of Nanomaterials

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The batch experiments of photocatalytic oxidation-reduction of bromate and ibuprofen (IBP) by graphene oxide (GO) and TiO2 heterostructure doped with F (FGT) particles were conducted. The performance and mechanism of synergistic removal of bromate and IBP by FGT were discussed. The results show that a demonstrable synergistic effect and excellent removal rate of bromate and IBP by FGT were exhibited. When pH is 5.2 and the dosage of FGT is 0.1 g/L, the reaction rate constants of bromate and IBP increased from 0.0584 min-1 and 0.4188 min-1 to 0.1353 min-1 and 0.4504 min-1, respectively, compared with the degradation of bromate or IBP alone. The reaction of photocatalytic synergistic degradation is appropriately fitted through Langmuir-Hinshelwood first-order kinetics. The mechanism of synergistic removal of bromate and IBP by FGT was discussed. And electrons (e-), hydroxyl radical (⋅OH), and superoxide radical (⋅O2-) are the main active species. The electrons play a main role in the bromate reduction, and bromine is the only reduction product, while the oxidation of IBP is the result of ⋅OH and ⋅O2-, and ⋅OH plays a key role. The recombination of electrons and holes is inhibited by simultaneous consumption of bromate and IBP, which makes full use of the redox properties of FGT and plays a synergistic role in the removal of pollutants. The results indicate that photocatalytic oxidation-reduction by FGT is a promising, efficient, and environmental-friendly method for synchronous removal of combined pollution in water.

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Electrochemical oxidation of perfluorinated compounds in water

Cited by 196 publications

References 94 publications

Electrochemical wastewater treatment: influence of the type of carbon and of nitrogen on the organic load removal

Electrochemical wastewater treatment: influence of the type of carbon and of nitrogen on the organic load removal

Efficient electrochemical degradation of poly- and perfluoroalkyl substances (PFASs) from the effluents of an industrial wastewater treatment plant

Synergistic Removal of Bromate and Ibuprofen by Graphene Oxide and TiO₂ Heterostructure Doped with F: Performance and Mechanism

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Electrochemical oxidation of perfluorinated compounds in water

Cited by 196 publications

References 94 publications

Electrochemical wastewater treatment: influence of the type of carbon and of nitrogen on the organic load removal

Electrochemical wastewater treatment: influence of the type of carbon and of nitrogen on the organic load removal

Efficient electrochemical degradation of poly- and perfluoroalkyl substances (PFASs) from the effluents of an industrial wastewater treatment plant

Synergistic Removal of Bromate and Ibuprofen by Graphene Oxide and TiO2 Heterostructure Doped with F: Performance and Mechanism

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Product

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Synergistic Removal of Bromate and Ibuprofen by Graphene Oxide and TiO₂ Heterostructure Doped with F: Performance and Mechanism