Preparation and properties of some salts of perfluorooctanoic acid

Lines, D. R.; Sutcliffe, H.

doi:10.1016/s0022-1139(00)81482-7

Cited by 29 publications

(15 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is, therefore, probable that the sodium salt of PFOA is formed by reaction of the acid with the surface (forming water) and then easily decomposes pyrolytically to the olefin (Eq. (5)) as is well known for such salts [22,23]:…”

Section: Resultsmentioning

confidence: 81%

See 1 more Smart Citation

Gas-phase NMR studies of the thermolysis of perfluorooctanoic acid

Krusic

Marchione

Roe

2005

Journal of Fluorine Chemistry

100

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 81%

“…From the derived activation parameters, a half-life of 2 s at 307 8C is estimated for APFO. It is anticipated that most other salts of PFOA will thermally decompose at temperatures substantially lower than those required for the free acid [22,23].…”

Section: Discussionmentioning

confidence: 99%

Gas-phase NMR studies of the thermolysis of perfluorooctanoic acid

Krusic

Marchione

Roe

2005

Journal of Fluorine Chemistry

100

View full text Add to dashboard Cite

“…Thermal degradation of solid PFOA and PFOS salts [244][245][246] and gaseous PFOA (acid and ammonium salts) [230,247] has been reported. The primary products during the thermolysis of perfluoroalkylcarboxylates are the analogous 1H-perfluoroalkane for the salts (NH 4 + , H + , Eq.…”

Section: Pfox Thermolysismentioning

confidence: 99%

“…A comparison of the extent of pyrolysis of similar carboxylate and sulfonate salts [243] reveals temperatures required for equivalent sulfonate salt decomposition to be 100 to 200 K greater than the corresponding carboxylate salt. The acid and ammonium salts are thermally converted to 1H-perfluoroalkane [242][243][244] and have a significantly lower decomposition temperature since no C-F bonds are broken. Thermolysis in the presence of ethylene glycol also primarily produces the1H-perfluoroalkane [242] suggesting that the perfluoroalkylanion is a weaker acid (pKa HOCH 2 CH 2 OH = 14.2).…”

Section: Pfox Thermolysismentioning

confidence: 99%

Treatment technologies for aqueous perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA)

Vecitis

Park

Cheng

et al. 2009

Front. Environ. Sci. Eng. China

373

256

View full text Add to dashboard Cite

Fluorochemicals (FCs) are oxidatively recalcitrant, environmentally persistent, and resistant to most conventional treatment technologies. FCs have unique physiochemical properties derived from fluorine which is the most electronegative element. Perfluorooctanesulfonate (PFOS), and perfluorooctanoate (PFOA) have been detected globally in the hydrosphere, atmosphere and biosphere. Reducing treatment technologies such as reverses osmosis, nano-filtration and activated carbon can remove FCs from water. However, incineration of the concentrated waste is required for complete FC destruction. Recently, a number of alternative technologies for FC decomposition have been reported. The FC degradation technologies span a wide range of chemical processes including direct photolysis, photocatalytic oxidation, photochemical oxidation, photochemical reduction, thermally-induced reduction, and sonochemical pyrolysis. This paper reviews these FC degradation technologies in terms of kinetics, mechanism, energetic cost, and applicability. The optimal PFOS/PFOA treatment method is strongly dependent upon the FC concentration, background organic and metal concentration, and available degradation time.

show abstract

“…These materials are stable against strong acids, bases, and oxidizing or reducing agents. Some special uses are also due to their high thermal stability [3]. Despite their low critical micellar concentrations (cmc) the use of fluorinated surfactants, such as perfluoroalkanecarboxylates and sulfonates, is limited because of their high Krafft temperature.…”

Section: Introductionmentioning

confidence: 99%

Precipitation of surfactant salts III. Metal perfluoroalkanecarboxylates

Fan

Čolić

Kalky

et al. 1988

Colloid & Polymer Sci

View full text Add to dashboard Cite

Precipitation of perfluorocarboxylic acids (n-C3HTOOH, n-C7H~sCOOH, and n-C9F19COOH ) in aqueous solutions of different metal nitrates (K § Ag § Ca 2 § Ba 2 § , Zn 2 § AP § La ~*) was studied by solubility and calorimetric measurements. The free energy of precipitation per single surfactant chain was found to depend on the chain length but not on the charge of the reacting cation. It was shown that the precipitation of perfluorocarboxylates of multivalent cations was governed by positive entropy change and a low enthalpic contribution, whereas the soaps of monovalent cations exhibited the opposite behavior. The entropy of precipitation was not affected by the chain length of the surfactants in the presence of monovalent cations, but it increased for cations of higher charge.

show abstract

Preparation and properties of some salts of perfluorooctanoic acid

Cited by 29 publications

References 5 publications

Gas-phase NMR studies of the thermolysis of perfluorooctanoic acid

Gas-phase NMR studies of the thermolysis of perfluorooctanoic acid

Treatment technologies for aqueous perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA)

Precipitation of surfactant salts III. Metal perfluoroalkanecarboxylates

Contact Info

Product

Resources

About