Hydrated electron based decomposition of perfluorooctane sulfonate (PFOS) in the VUV/sulfite system

Gu, Yu; Liu, Tongzhou; Wang, Hongjie; Han, Hongjun; Dong, Wenyi

doi:10.1016/j.scitotenv.2017.06.197

Cited by 122 publications

(95 citation statements)

References 39 publications

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“…The decomposition percentage was highest under an initial pH of 10.0, while lowest observed rate was at an initial pH of 4.0. These results show that the e aq --mediated decomposition of PFOS is more effective under alkaline conditions, which is a result that is consistent with previous report[17,18]. The defluorination percentage after 10 h also increased with an increase in pH as follows for pH of 4, 6, 7, 9 and 10 after 10 h of irradiation were 27.77%, 29.99%, 41.38%, 46.38% and 51.19%, respectively.…”

supporting

confidence: 92%

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Enhanced photoreductive degradation of perfluorooctanesulfonate by UV irradiation in the presence of ethylenediaminetetraacetic acid

Zhang

Sun

et al. 2020

Chemical Engineering Journal

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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supporting

confidence: 92%

“…But high temperature and strong alkaline conditions would be bottleneck of the application of this process. UV photolysis of sulfite [12,18] or iodide [13] produces a sufficient level of e aq -, being…”

Section: Introductionmentioning

confidence: 99%

Enhanced photoreductive degradation of perfluorooctanesulfonate by UV irradiation in the presence of ethylenediaminetetraacetic acid

Zhang

Sun

et al. 2020

Chemical Engineering Journal

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“…The reaction rate constant was 0.87 h −1 , which was about 8 and 2-folds the reaction rate for VUV and UV/sulphite processes. With VUV/sulphite process, a high degradation efficiency was still achieved even at both weak acidic and alkaline pH [ 127 ].…”

Section: Advanced Reduction Processes For Pfas Degradationmentioning

confidence: 99%

Photo enhanced degradation of polyfluoroalkyl and perfluoroalkyl substances

Olatunde

Kuvarega

Onwudiwe

2020

Heliyon

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The increase in the presence of highly recalcitrant poly- and per- fluoroalkyl substances (PFAS) in the environment, plant tissues and animals continues to pose serious health concerns. Several treatment methods such as physical, biological and chemical processes have been explored to deal with these compounds. Current trends have shown that the destructive treatment processes, which offer degradation and mineralization of PFASs, are the most desirable process among researchers and policy makers. This article, therefore, reviews the degradation and defluorination processes, their efficiencies and the degradation mechanism of photon-based processes. It shows that high degradation and defluorination efficiency of PFASs could be achieved by photon driven processes such as photolysis, photochemical, photocatalysis and photoreduction. The efficiency of these processes is greatly influenced by the nature of light and the reactive radical generated in the system. The limitation of these processes, however, include the long reaction time required and the use of anoxic reaction conditions, which are not obtainable at ambient conditions.

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“…The chemical stability of PFASs makes them resistant to most conventional treatment technologies or even most advanced oxidation processes (AOPs). Photolytic techniques have shown varying degrees of efficacy on high concentrations of PFASs (Gu, Liu, Wang, Han, & Dong, ), and ultrasonic irradiation and plasma oxidation have shown effectiveness to degrade different PFASs (Cheng, Vecitis, Park, Mader, & Hoffmann, ; Vecitis, Park, Cheng, Mader, & Hoffmann, ). However, most of these destructive techniques for PFASs only work in specific conditions largely unsuitable for large‐scale remediation of groundwater, including extreme pH ranges, high energy consumption, chemical additives, and other harsh treatment conditions.…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, IXR can be regenerated on site using a mixture containing methanol and NaCl solution, while regeneration is not an on-site option for GAC. (Gu, Liu, Wang, Han, & Dong, 2017), and ultrasonic irradiation and plasma oxidation have shown effectiveness to degrade different PFASs . However, most of these destructive techniques for PFASs only work in specific conditions largely unsuitable for large-scale remediation of groundwater, including extreme pH ranges, high energy consumption, chemical additives, and other harsh treatment conditions.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical oxidation of PFOA and PFOS in concentrated waste streams

Liang¹,

Pierce

Lin

et al. 2018

Remediation Journal

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The electrochemical oxidation (EO) of environmentally persistent perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) with a Magnéli phase Ti4O7 electrode was investigated in this study. After 3 hours (hr) of electrolysis, 96.0 percent of PFOA (10 milligrams per liter [mg/L] in 100 milliliters [mL] 100 millimolar [mM] Na2SO4 solution) was removed following pseudo first‐order kinetics (k = 0.0226 per minute [min]) with the degradation half‐life of 30.7 min. Under the same treatment conditions, PFOS (10 mg/L in 100 mL 100 mM Na2SO4 solution) removal reached 98.9 percent with a pseudo first‐order degradation rate constant of 0.0491/min and the half‐life of 14.1 min. Although, the degradation of PFOA was slower than PFOS, when subjected to EO treatment in separate solutions, PFOA appeared to degrade faster than PFOS when both are present in the same solution, indicating possible competition between PFOA and PFOS during Ti4O7 anode‐based EO treatment with PFOA having the competitive advantage. Moreover, the EO treatment was applied to degrade highly concentrated PFOA (100.5 mg/L) and PFOS (68.6 mg/L) in ion‐exchange resin regenerant (still bottom) with high organic carbon content (15,800 mg/L). After 17‐hr electrolysis, the total removal of PFOA and PFOS was 77.2 and 96.5 percent, respectively, and the fluoride concentration increased from 0.84 mg/L to 836 mg/L. Also, the dark brown color of the original solution gradually faded during EO treatment. In another test using still bottom samples with lower total organic carbon (9,880 mg/L), the PFOA (15.5 mg/L) and PFOS (25.5 mg/L) concentrations were reduced to levels below the limits of quantification after 16‐hr treatment. In addition, the performance of EO treatment using different batch reactor setups was compared in this study, including one‐sided (one anode:one cathode) and two‐sided (one anode:two cathodes) setups. The two‐sided reactor configuration significantly enhanced the degradation efficiency, likely due to the larger anode area available for reactions.

show abstract

Hydrated electron based decomposition of perfluorooctane sulfonate (PFOS) in the VUV/sulfite system

Cited by 122 publications

References 39 publications

Enhanced photoreductive degradation of perfluorooctanesulfonate by UV irradiation in the presence of ethylenediaminetetraacetic acid

Enhanced photoreductive degradation of perfluorooctanesulfonate by UV irradiation in the presence of ethylenediaminetetraacetic acid

Photo enhanced degradation of polyfluoroalkyl and perfluoroalkyl substances

Electrochemical oxidation of PFOA and PFOS in concentrated waste streams

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