Efficient Decomposition of Environmentally Persistent Perfluorocarboxylic Acids by Use of Persulfate as a Photochemical Oxidant

Hori, Hisao; Yamamoto, Ari; Hayakawa, Etsuko; Taniyasu, Sachi; Yamashita, Nobuyoshi; Kutsuna, Shuzo; Kiatagawa, Hiroshi; Arakawa, Ryuichi

doi:10.1021/es0484754

Cited by 518 publications

(289 citation statements)

References 34 publications

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“…The formation of formic acid indicated that the C C bond between C 7 F 15 and COOH may be cleaved firstly during PFOA decomposition. Hori et al [22,23] pointed out that CO 2 was identified in the gas phase when photochemical decomposition of PFOA under the condition of 0.48 MPa oxygen gas. In the present study, the reaction was conducted in an open system, and any possible products in the gas phase such as CO 2 were not determined.…”

Section: Effect Of Fe (Iii) On Photochemical Decomposition Of Pfoamentioning

confidence: 99%

“…H 3 PW 12 O 40 [22] or by using persulfate ion (S 2 O 8 2− ) [23] as photochemical oxidant under UV-vis light irradiation (220-460 nm) in the presence of oxygen gas. On the other hand, Zhang et al [24,25] investigated the influences of oxidant (K 2 S 2 O 8 ), reaction atmospheres (O 2 , N 2 ) and UV light (185 nm and 254 nm light) on PFOA decomposition.…”

Section: Introductionmentioning

confidence: 99%

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Ferric ion mediated photochemical decomposition of perfluorooctanoic acid (PFOA) by 254nm UV light

Wang

Zhang

Pan

et al. 2008

Journal of Hazardous Materials

150

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a b s t r a c tThe great enhancement of ferric ion on the photochemical decomposition of environmentally persistent perfluorooctanoic acid (PFOA) under 254 nm UV light was reported. In the presence of 10 M ferric ion, 47.3% of initial PFOA (48 M) was decomposed and the defluorination ratio reached 15.4% within 4 h reaction time. While the degradation and defluorination ratio greatly increased to 80.2% and 47.8%, respectively, when ferric ion concentration increased to 80 M, and the corresponding half-life was shortened to 103 min. Though the decomposition rate was significantly lowered under nitrogen atmosphere, PFOA was efficiently decomposed too. Other metal ions like Cu 2+ and Zn 2+ also slightly improved the photochemical decomposition of PFOA under irradiation of 254 nm UV light. Besides fluoride ion, other intermediates during PFOA decomposition including formic acid and five shorter-chain perfluorinated carboxylic acids (PFCAs) with C7, C6, C5, C4 and C3, respectively, were identified and quantified by IC or LC/MS. The mixture of PFOA and ferric ion had strong absorption around 280 nm. It is proposed that PFOA coordinates with ferric ion to form a complex, and its excitation by 254 nm UV light leads to the decomposition of PFOA in a stepwise way.

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Section: Effect Of Fe (Iii) On Photochemical Decomposition Of Pfoamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ferric ion mediated photochemical decomposition of perfluorooctanoic acid (PFOA) by 254nm UV light

Wang

Zhang

Pan

et al. 2008

Journal of Hazardous Materials

150

View full text Add to dashboard Cite

show abstract

“…Therefore, UV/S 2 O 8 2-process has been confirmed to be effective in degrading organic contaminants (Hori et al 2005(Hori et al , 2007Lau et al 2007;Salari et al 2009;Criquet and Leitner 2009;Lin et al 2011). For example, Lin et al (2011) found that phenol (0.5 mM) can be completely degraded within 20 min using UV/S 2 O 8 2-process with a UV wavelength of 254 nm and an S 2 O 8 2-concentration of 84 mM.…”

Section: Introductionmentioning

confidence: 99%

Degradation of polyvinyl alcohol in aqueous solutions using UV-365 nm/S2O8 2− process

Lin

Lee

Hsu

2013

Int. J. Environ. Sci. Technol.

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This investigation evaluates the effectiveness of UV-365 nm/S 2 O 8 2-process in degrading polyvinyl alcohol in aqueous solutions. The effects of pH, Na 2 S 2 O 8 dosage, and temperature on the degradation efficiency of polyvinyl alcohol were studied. Under acidic conditions, the degradation efficiency of polyvinyl alcohol exceeded that under alkaline conditions. Additionally, a higher Na 2 S 2 O 8 dosage and a higher temperature were associated with a higher degradation efficiency of polyvinyl alcohol. The degradation rates of polyvinyl alcohol followed a pseudo-first-order kinetic model. Moreover, the observed degradation rate coefficient increased from 0.0078 to 0.4081 min -1 when the temperature was increased from 10 to 55°C. Also, the activation energy estimated using the observed degradation rate coefficients and the Arrhenius equation was 64 kJ/mol. At UV-365 nm, pH 3, an Na 2 S 2 O 8 dosage of 0.06 g/L, a temperature of 55°C, and an initial polyvinyl alcohol concentration of 20 mg/L, around 100 % of polyvinyl alcohol was degraded, indicating that UV-365 nm/S 2 O 8 2-process has great potential in degrading polyvinyl alcohol in aqueous solutions.

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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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Efficient Decomposition of Environmentally Persistent Perfluorocarboxylic Acids by Use of Persulfate as a Photochemical Oxidant

Cited by 518 publications

References 34 publications

Ferric ion mediated photochemical decomposition of perfluorooctanoic acid (PFOA) by 254nm UV light

Ferric ion mediated photochemical decomposition of perfluorooctanoic acid (PFOA) by 254nm UV light

Degradation of polyvinyl alcohol in aqueous solutions using UV-365 nm/S2O8 2− process

Temperature effect on photolysis decomposing of perfluorooctanoic acid

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