Removal of perfluorooctanoic acid and perfluorooctane sulfonate via ozonation under alkaline condition

Lin, Angela Yu-Chen; Panchangam, Sri Chandana; Chang, Chieh-Ming J.; Peng, Hong; Hsueh, Han‐Fang

doi:10.1016/j.jhazmat.2012.10.029

Cited by 78 publications

(36 citation statements)

References 25 publications

(32 reference statements)

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“…Based on the above distribution of PFCA intermediates (Fig. S12) and other studies on the oxidation degradation of PFCAs [6][7][8][9][10][11][12][13][14][15]45,46], it could be proposed that the decomposition of PFOA followed the stepwise CF 2 flake-off reactions from the end of carboxylic acid. PFOA first lost an electron from its relatively unstable carboxyl group to Ti/SnO 2 -F anode, and generated PFOA radical in Step (1).…”

Section: Optimization Of Preparation Process For F-doped Ti/sno 2 Elementioning

confidence: 89%

“…But these methods entailed harsh reaction condition with the excess energy input such as high-intensity ultrasonic, ultraviolet light, or heat. Some chemical oxidants were also used to degrade PFOA in hydrothermal reaction system such as persulfate and ozone; however, they needed a long-lasting reaction that continued for hours or days and were incomplete in the light of defluorination and mineralization degrees [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Highly efficient electrochemical degradation of perfluorooctanoic acid (PFOA) by F-doped Ti/SnO2 electrode

Yang

Jiang

et al. 2015

Journal of Hazardous Materials

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Section: Optimization Of Preparation Process For F-doped Ti/sno 2 Elementioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Highly efficient electrochemical degradation of perfluorooctanoic acid (PFOA) by F-doped Ti/SnO2 electrode

Yang

Jiang

et al. 2015

Journal of Hazardous Materials

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“…Direct photolysis [8], VB 12 /Ti 3+ reduction [9] and permanganate oxidation [2] also show low defluorination efficiencies and incompletely mineralization of PFOS. In contrast, photo reduction [10], [11], sonolysis [12]–[17], sub-critical elemental iron reduction [18], electrochemical oxidation [19] and alkaline ozonation [20] have been proved effective.…”

Section: Introductionmentioning

confidence: 99%

Defluorination of Aqueous Perfluorooctanesulfonate by Activated Persulfate Oxidation

et al. 2013

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Activated persulfate oxidation technologies based on sulfate radicals were first evaluated for defluorination of aqueous perfluorooctanesulfonate (PFOS). The influences of catalytic method, time, pH and K2S2O8 amounts on PFOS defluorination were investigated. The intermediate products during PFOS defluorination were detected by using LC/MS/MS. The results showed that the S2O8 2− had weak effect on the defluorination of PFOS, while the PFOS was oxidatively defluorinated by sulfate radicals in water. The defluorination efficiency of PFOS under various treatment was followed the order: HT (hydrothermal)/K2S2O8 > UV (ultraviolet)/K2S2O8 > Fe2+/K2S2O8 > US (ultrasound)/K2S2O8. Low pH was favorable for the PFOS defluorination with sulfate radicals. Increase in the amount of S2O8 2− had positive effect on PFOS defluorination. However, further increase in amounts of S2O8 2− caused insignificant improvement in PFOS defluorination due to elimination of sulfate radicals under high concentration of S2O8 2−. CF3(CF2)nCOOH (n = 0–6) were detected as intermediates during PFOS defluorination. Sulfate radicals oxidation and hydrolysis were the main mechanisms involved in defluorination process of PFOS.

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“…The indirect photoreactions have been developed to improve the efficiency of photo degradation. Some oxidants, such as ozone (Lin et al, 2012a), persulfate (Hori et al, 2005) and ferric ion (Hori et al, 2007), have been found to enhance the degradation and mineralization of PFOA. However, these methods require chemical compounds that are potential secondary pollutants.…”

Section: Introductionmentioning

confidence: 99%

Temperature effect on photolysis decomposing of perfluorooctanoic acid

Zhang

Pan

Zhou

2016

Journal of Environmental Sciences

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Perfluorooctanoic acid (PFOA) is recalcitrant to degrade and mineralize. Here, the effect of temperature on the photolytic decomposition of PFOA was investigated. The decomposition of PFOA was enhanced from 34% to 99% in 60 min of exposure when the temperature was increased from 25 to 85°C under UV light (201-600 nm). The limited degree of decomposition at 25°C was due to low quantum yield, which was increased by a factor of 12 at 85°C.Under the imposed conditions, the defluorination ratio increased from 8% at 25°C to 50% at 85°C in 60 min. Production of perfluorinated carboxylic acids (PFCAs, C7-C5), PFCAs (C4-C3) and TFA (trifluoroacetic acid, C2) accelerated and attained a maximum within 30 to 90 min at 85°C. However, these reactions did not occur at 25°C despite extended irradiation to 180 min. PFOA was decomposed in a step-wise process by surrendering one CF 2 unit. In each cyclical process, increased temperature enhanced the quantum yields of irradiation and reactions between water molecules and intermediates radicals. The energy consumption for removing each μmol of PFOA was reduced from 82.5 kJ at 25°C to 10.9 kJ at 85°C using photolysis. Photolysis coupled with heat achieved high rates of PFOA degradation and defluorination.

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Removal of perfluorooctanoic acid and perfluorooctane sulfonate via ozonation under alkaline condition

Cited by 78 publications

References 25 publications

Highly efficient electrochemical degradation of perfluorooctanoic acid (PFOA) by F-doped Ti/SnO2 electrode

Highly efficient electrochemical degradation of perfluorooctanoic acid (PFOA) by F-doped Ti/SnO2 electrode

Defluorination of Aqueous Perfluorooctanesulfonate by Activated Persulfate Oxidation

Temperature effect on photolysis decomposing of perfluorooctanoic acid

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