Photochemical decomposition of perfluorooctanoic acid in aqueous periodate with VUV and UV light irradiation

Cao, Miao; Wang, B.B.; Yu, Hongwei; Wang, L.L.; Yuan, Shuiqiao; Chen, Jianjun

doi:10.1016/j.jhazmat.2010.02.030

Cited by 127 publications

(51 citation statements)

References 20 publications

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“…However, ultraviolet (UV) radiation-based oxidation methods are shown to be more promising than other AOTs. Although direct UVC (254 nm) photolytic degradation of PFOA is negligibly small (Chen et al 2007;Giri et al 2011), use of chemical oxidants together with UVC can decompose the compound more easily (Chen and Zhang 2006;Wang et al 2008;Cao et al 2010;Tang et al 2012). Furthermore, it has been demonstrated during the last few years that vacuum UV (VUV) (185 nm) photolysis is more efficient than other VU-based methods for PFOA degradation (Chen et al 2007;Giri et al 2011Giri et al , 2012.…”

Section: Introductionmentioning

confidence: 99%

Oxidative–reductive photodecomposition of perfluorooctanoic acid in water

Giri

Ozaki

Guo

et al. 2013

Int. J. Environ. Sci. Technol.

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This article aims to elucidate on usefulness of vacuum ultraviolet (VUV) for photoreductive degradation of perfluorooctanoic acid (PFOA), a representative perfluorinated compound (PFC), in water for the first time. Bench-scale tests were conducted on oxidative and reductive (with aquated electron: e aq -) mineralization of PFOA using low-pressure UV (LPUV) lamps and potassium iodide. Unlike with 254 nm wavelength (UVC), the reductive mineralization with VUV was very inefficient compared to the corresponding oxidative mineralization. The inefficiency is attributed to low reactivity of e aq -with PFOA and its fluorinated products than that of 185 nm photons. Direct VUV photolysis of PFOA and its products in reductive reaction conditions was not apparent due to a very big difference in reactivity of 185 and 254 nm photons with iodide. The results demonstrated that highly energetic VUV photons are not suitable for photoreductive degradations of PFCs involving e aq -, but they can be best used for oxidative degradations. These findings should serve as an important reference on VUV usage to decompose refractory micropollutants.

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Section: Introductionmentioning

confidence: 99%

Oxidative–reductive photodecomposition of perfluorooctanoic acid in water

Giri

Ozaki

Guo

et al. 2013

Int. J. Environ. Sci. Technol.

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“…Other in situ remediation strategies may include stimulation of the microbially driven Fenton reaction by placing reactive iron barriers in the flow path of contaminated subsurface aquifers and exposing Fe(III)-reducing bacteria attached to the iron barriers to alternating anaerobic and aerobic conditions (57). Additional targets for ex situ and in situ degradation by the microbially driven Fenton reaction developed in the present study include multiple combinations of environmental contaminants susceptible to attack by Fenton reaction-generated HO˙radicals, including commingled plumes of 1,4-dioxane, PCP (35,36), PCE (24), TCE (23), TCA (37), and PFAS (58).…”

Section: Discussionmentioning

confidence: 99%

Simultaneous Transformation of Commingled Trichloroethylene, Tetrachloroethylene, and 1,4-Dioxane by a Microbially Driven Fenton Reaction in Batch Liquid Cultures

Sekar

Taillefert

DiChristina

2016

Appl Environ Microbiol

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Improper disposal of 1,4-dioxane and the chlorinated organic solvents trichloroethylene (TCE) and tetrachloroethylene (also known as perchloroethylene [PCE]) has resulted in widespread contamination of soil and groundwater. In the present study, a previously designed microbially driven Fenton reaction system was reconfigured to generate hydroxyl (HO˙) radicals for simultaneous transformation of source zone levels of single, binary, and ternary mixtures of TCE, PCE, and 1,4-dioxane. The reconfigured Fenton reaction system was driven by fed batch cultures of the Fe(III)-reducing facultative anaerobe Shewanella oneidensis amended with lactate, Fe(III), and contaminants and exposed to alternating anaerobic and aerobic conditions. To avoid contaminant loss due to volatility, the Fe(II)-generating, hydrogen peroxide-generating, and contaminant transformation phases of the microbially driven Fenton reaction system were separated. The reconfigured Fenton reaction system transformed TCE, PCE, and 1,4-dioxane either as single contaminants or as binary and ternary mixtures. In the presence of equimolar concentrations of PCE and TCE, the ratio of the experimentally derived rates of PCE and TCE transformation was nearly identical to the ratio of the corresponding HO˙radical reaction rate constants. The reconfigured Fenton reaction system may be applied as an ex situ platform for simultaneous degradation of commingled TCE, PCE, and 1,4-dioxane and provides valuable information for future development of in situ remediation technologies. IMPORTANCE A microbially driven Fenton reaction system [driven by the Fe(III)-reducing facultative anaerobe S. oneidensis] was reconfigured to transform source zone levels of TCE, PCE, and 1,4-dioxane as single contaminants or as binary and ternary mixtures.The microbially driven Fenton reaction may thus be applied as an ex situ platform for simultaneous degradation of at least three (and potentially more) commingled contaminants. Additional targets for ex situ and in situ degradation by the microbially driven Fenton reaction developed in the present study include multiple combinations of environmental contaminants susceptible to attack by Fenton reaction-generated HO˙radicals, including commingled plumes of 1,4-dioxane, pentachlorophenol (PCP), PCE, TCE, 1,1,2-trichloroethane (TCA), and perfluoroalkylated substances (PFAS).T he chlorinated organic solvents trichloroethylene (TCE) and tetrachloroethylene (also known as perchloroethylene [PCE]) have been historically employed as solvents in a variety of industrial processes, including vapor degreasing of metal surfaces, paint stripping, and dry cleaning (1, 2). TCE and PCE are carcinogenic, and improper disposal practices at industrial sites have resulted in widespread contamination of soil and groundwater (1-6). Due to their high density and low aqueous phase solubility, TCE and PCE are also highly persistent in contaminated environments (3, 4). The potential carcinogen 1,4-dioxane is generally employed as a stabilizer for TCE and PCE i...

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“…Direct photolysis caused 22.6% PFOA degradation after 8 h UV irradiation. PFOA can be efficiently photodecomposed under light of 220-460 nm wavelengths [12,20]. The degradation of PFOA in the presence of TiO 2 NTs or NIP-TiO 2 NTs (41% and 67%, resp.)…”

Section: Degradation Kineticsmentioning

confidence: 99%

Selective Removal of Perfluorooctanoic Acid Using Molecularly Imprinted Polymer-Modified TiO₂Nanotube Arrays

Tian

et al. 2016

International Journal of Photoenergy

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Perfluorinated chemicals have attracted worldwide concern owing to their wide occurrence and resistance to most conventional treatment processes. In this work, a novel photocatalyst was fabricated by modifying TiO 2 nanotube arrays with molecularly imprinted polymers. The molecularly imprinted polymer-modified TiO 2 nanotubes (MIP-TiO 2 NTs) were characterized and tested for the selective removal of perfluorooctanoic acid (PFOA) from water. The amount of PFOA adsorbed by the MIP-TiO 2 NTs was as high as 0.8125 g/cm 2 . PFOA decomposition and defluorination by the MIP-TiO 2 NTs reached 84% and 30.2% after 8 h reaction, respectively. The Freundlich model and pseudo-first-order kinetics were used to describe the observed adsorption and decomposition of PFOA, respectively. Compared with TiO 2 NTs and nonmolecularly imprinted polymer-modified TiO 2 NTs, the MIP-TiO 2 NTs exhibited not only a higher PFOA degradation rate but also enhanced selectivity for target chemicals. The MIP-TiO 2 NTs could also selectively and rapidly remove PFOA from secondary effluent, exhibiting a decomposition of 81.1%, almost as high as that observed in pure water. Investigation of the effects of scavengers on the photocatalytic reaction indicated that photogenerated holes were the main oxidant for PFOA decomposition, and the PFOA degradation mechanism and pathway were proposed.

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Photochemical decomposition of perfluorooctanoic acid in aqueous periodate with VUV and UV light irradiation

Cited by 127 publications

References 20 publications

Oxidative–reductive photodecomposition of perfluorooctanoic acid in water

Oxidative–reductive photodecomposition of perfluorooctanoic acid in water

Simultaneous Transformation of Commingled Trichloroethylene, Tetrachloroethylene, and 1,4-Dioxane by a Microbially Driven Fenton Reaction in Batch Liquid Cultures

Selective Removal of Perfluorooctanoic Acid Using Molecularly Imprinted Polymer-Modified TiO₂Nanotube Arrays

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Photochemical decomposition of perfluorooctanoic acid in aqueous periodate with VUV and UV light irradiation

Cited by 127 publications

References 20 publications

Oxidative–reductive photodecomposition of perfluorooctanoic acid in water

Oxidative–reductive photodecomposition of perfluorooctanoic acid in water

Simultaneous Transformation of Commingled Trichloroethylene, Tetrachloroethylene, and 1,4-Dioxane by a Microbially Driven Fenton Reaction in Batch Liquid Cultures

Selective Removal of Perfluorooctanoic Acid Using Molecularly Imprinted Polymer-Modified TiO2Nanotube Arrays

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Product

Resources

About

Selective Removal of Perfluorooctanoic Acid Using Molecularly Imprinted Polymer-Modified TiO₂Nanotube Arrays