Persulfate-based degradation of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in aqueous solution: Review on influences, mechanisms and prospective

Yang, Lie; He, Liuyang; Xue, Jianming; Ma, Yongfei; Xie, Zhiyong; Wu, Li; Huang, Min; Zhang, Zulin

doi:10.1016/j.jhazmat.2020.122405

Cited by 188 publications

(63 citation statements)

References 102 publications

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“…Despite achieving a higher mineralization degree at pH 0 : 9, the highest defluorination was reached when starting in acidic media. Considering PFOA degradation with sulfate radicals, the literature review by Yang et al highlights that the decomposition and defluorination efficiencies increase with a decrease in PFOA chain-length [39]. Besides the major role of hydroxyl radicals on PFOA oxidation, the presence of sulfate radicals helps to improve the degradation of the generated intermediates.…”

Section: Hso + Ho • → So • + H Omentioning

confidence: 99%

On the Role of the Cathode for the Electro-Oxidation of Perfluorooctanoic Acid

et al. 2020

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Perfluorooctanoic acid (PFOA), C7F15COOH, has been widely employed over the past fifty years, causing an environmental problem because of its dispersion and low biodegradability. Furthermore, the high stability of this molecule, conferred by the high strength of the C-F bond makes it very difficult to remove. In this work, electrochemical techniques are applied for PFOA degradation in order to study the influence of the cathode on defluorination. For this purpose, boron-doped diamond (BDD), Pt, Zr, and stainless steel have been tested as cathodes working with BDD anode at low electrolyte concentration (3.5 mM) to degrade PFOA at 100 mg/L. Among these cathodic materials, Pt improves the defluorination reaction. The electro-degradation of a PFOA molecule starts by a direct exchange of one electron at the anode and then follows a complex mechanism involving reaction with hydroxyl radicals and adsorbed hydrogen on the cathode. It is assumed that Pt acts as an electrocatalyst, enhancing PFOA defluorination by the reduction reaction of perfluorinated carbonyl intermediates on the cathode. The defluorinated intermediates are then more easily oxidized by HO• radicals. Hence, high mineralization (xTOC: 76.1%) and defluorination degrees (xF−: 58.6%) were reached with Pt working at current density j = 7.9 mA/cm2. This BDD-Pt system reaches a higher efficiency in terms of defluorination for a given electrical charge than previous works reported in literature. Influence of the electrolyte composition and initial pH are also explored.

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Section: Hso + Ho • → So • + H Omentioning

confidence: 99%

On the Role of the Cathode for the Electro-Oxidation of Perfluorooctanoic Acid

et al. 2020

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“…Os persulfatos, também conhecidos como peroxidissulfato (S2O8 ²-), formados por radicais sulfato (SO4 •-) vêm ganhando bastante destaque em função do alto potencial de degradação de poluentes emergentes com carga orgânica elevada e persistentes que podem ser encontrados em grande parte dos efluentes industriais. Se apresentam como uma excelente alternativa para aplicação nos POAs como um excelente oxidante, principalmente pela característica não seletiva, elevada estabilidade, não gerarem organoclorados e, além disso, por serem consumidos por completo na reação diminuindo consideravelmente as chances de se originarem compostos mais tóxicos e menos suscetíveis a processos de degradação posteriores (YANG et al, 2019;YANG et al, 2020). A alternativa promissora no uso do persulfato é evidenciado na (Figura 2) que apresenta um aumento exponencial de publicação de estudos com este oxidante.…”

Section: Persulfatosunclassified

Simulação Da Concentração De Matéria Orgânica Em Canais Urbanos: Estudo De Caso Canal Do Prado, Campina Grandepb

Sasaki¹,

Brito²,

Neto³

et al. 2021

Meio Ambiente E Sustentabilidade: Pesquisa, Reflexões E Diálogos Emergentes

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Meio ambiente e sustentabilidade: pesquisa, reflexões e diálogos emergentes está licenciado sob CC BY 4.0.Esta licença exige que as reutilizações deem crédito ao criador. Ele permite que os reutilizadores distribuam, remixem, adaptem e construam o material em qualquer meio ou formato, mesmo para fins comerciais. O conteúdo da obra e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores, não representando a posição oficial da Editora Amplla. É permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores. Todos os direitos para esta edição foram cedidos à Editora Amplla.

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“…While purified enzymes catalyzing defluorination of perfluorinated compounds have not been reported to date, insights can be derived from the whole-cell studies described above and in the context of chemical degradation experiments that use strong oxidants and reductants. Perfluorinated compounds are highly inert to nucleophilic displacement reactions, but persulfate and nickel-iron reagents have been shown to catalyze PFOA oxidation and reduction reactions, respectively, that lead to fluoride release and chain shortening [98][99][100]. In those studies, it is generally agreed that both oxidation and reduction reactions proceed through a carboncentered radical intermediate ( Figure 6B).…”

Section: Perfluorinated Compoundsmentioning

confidence: 99%

The ever-expanding limits of enzyme catalysis and biodegradation: polyaromatic, polychlorinated, polyfluorinated, and polymeric compounds

Wackett

Robinson

2020

Biochemical Journal

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Biodegradation is simply the metabolism of anthropogenic, or otherwise unwanted, chemicals in our environment, typically by microorganisms. The metabolism of compounds commonly found in living things is limited to several thousand metabolites whereas ∼100 million chemical substances have been devised by chemical synthesis, and ∼100 000 are used commercially. Since most of those compounds are not natively found in living things, and some are toxic or carcinogenic, the question arises as to whether there is some organism somewhere with the enzymes that can biodegrade them. Repeatedly, anthropogenic chemicals have been denoted ‘non-biodegradable,’ only to find they are reactive with one or more enzyme(s). Enzyme reactivity has been organized into categories of functional group transformations. The discovery of new functional group transformations has continually expanded our knowledge of enzymes and biodegradation. This expansion of new-chemical biodegradation is driven by the evolution and spread of newly evolved enzymes. This review describes the biodegradation of widespread commercial chemicals with a focus on four classes: polyaromatic, polychlorinated, polyfluorinated, and polymeric compounds. Polyaromatic hydrocarbons include some of the most carcinogenic compounds known. Polychlorinated compounds include polychlorinated biphenyls (PCBs) and many pesticides of the twentieth century. Polyfluorinated compounds are a major focus of bioremediation efforts today. Polymers are clogging landfills, killing aquatic species in the oceans and increasingly found in our bodies. All of these classes of compounds, each thought at one time to be non-biodegradable, have been shown to react with natural enzymes. The known limits of enzyme catalysis, and hence biodegradation, are continuing to expand.

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Persulfate-based degradation of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in aqueous solution: Review on influences, mechanisms and prospective

Cited by 188 publications

References 102 publications

On the Role of the Cathode for the Electro-Oxidation of Perfluorooctanoic Acid

On the Role of the Cathode for the Electro-Oxidation of Perfluorooctanoic Acid

Simulação Da Concentração De Matéria Orgânica Em Canais Urbanos: Estudo De Caso Canal Do Prado, Campina Grandepb

The ever-expanding limits of enzyme catalysis and biodegradation: polyaromatic, polychlorinated, polyfluorinated, and polymeric compounds

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