Electron spin resonance studies. Part XXV. Reactions of the sulphate radical anion with organic compounds

Norman, R. O. C.; Storey, P. M.; West, Paul R.

doi:10.1039/j29700001087

Cited by 140 publications

(74 citation statements)

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“…Secondly, surface bound Fe 2+ on the surface of the FeS to initiate heterogeneous reaction will be fully dissolved at pH <3.0, and the activating species become the homogeneous Fe 2+ ions. Thirdly, SO 4 ÀÅ in aqueous solution could result in radical interconversion reactions to produce the hydroxyl radical ( Å OH) (E 0 = 2.7V) in accordance with the following reactions [24,[40][41]:…”

Section: Effects Of Initial Phmentioning

confidence: 96%

Degradation of p-chloroaniline by persulfate activated with ferrous sulfide ore particles

Yuan

Tao

Fan

et al. 2015

Chemical Engineering Journal

120

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Section: Effects Of Initial Phmentioning

confidence: 96%

Degradation of p-chloroaniline by persulfate activated with ferrous sulfide ore particles

Yuan

Tao

Fan

et al. 2015

Chemical Engineering Journal

120

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“…(5). When the pH is above 7, a conversion of SO -4 $ to OH$ makes it the dominant radical specie [16]. Hydroxyl radicals have a very low reactivity with PFOA in aqueous solutions.…”

Section: Effects Of Phmentioning

confidence: 99%

“…Alkaline pH : SO -4 $ þ OH -↕ ↓ SO 2 -4 þ OH$ (5) Equations (4) and (5) show the potential coexistence of SO -4 $ and OH$, and the coexistence has been evidenced by electron spin resonance [16]. When pH is above 7, the conversion of SO -4 $ to OH$ via Eq.…”

Section: Introductionmentioning

confidence: 97%

Decomposition of perfluorooctanoic acid by microwaveactivated persulfate: Effects of temperature, pH, and chloride ions

Lee¹,

Lo²,

Kuo

et al. 2011

Front. Environ. Sci. Eng.

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Microwave-hydrothermal treatment of persistent and bioaccumulative perfluorooctanoic acid (PFOA) in water with persulfate (S 2 O 2 -8 ) has been found effective. However, applications of this process to effectively remediate PFOA pollution require a better understanding on free-radical scavenging reactions that also take place. The objectives of this study were to investigate the effects of pH (pH = 2.5, 6.6, 8.8, and 10.5), chloride concentrations (0.01-0.15 mol$L -1 ), and temperature (60°C, 90°C, and 130°C) on persulfate oxidation of PFOA under microwave irradiation. Maximum PFOA degradation occurred at pH 2.5, while little or no degradation at pH 10.5. Lowering system pH resulted in an increase in PFOA degradation rate. Both high pH and chloride concentrations would result in more scavenging of sulfate free radicals and slow down PFOA degradation. When chloride concentrations were less than 0.04 mol$L -1 at 90°C and 0.06 mol$L -1 at 60°C, presence of chloride ions had insignificant impacts on PFOA degradation. However, beyond these concentration levels, PFOA degradation rates reduced significantly with an increase in chloride concentrations, especially under the higher temperature.

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“…~h~ fects arising from the nature of the substituent (23, 24, 3 1, assignment of the remaining P-CH, proton coupling to the 32). Thus, the strong electronegativity of the fluorine sub-P -~H 2 X group is further by comparisons with data stituent in 1 could account for the apparent low reactivity of for analogous radicals (5,6,23,24). ~h~ g-values found for *OSO,-with 1 in comparison with that of *SO,-.…”

Section: Resultsmentioning

confidence: 92%

Electron paramagnetic resonance study of radicals derived from 2- and 3-fluoropropene

Smith¹,

Hougum²,

Hosseinian³

1993

Can. J. Chem.

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Using the TiCl3–H2O2, –NH2OH, −Na2S2O8, and −H2O2/Na2SO3, continuous-flow, radical-generating methods at 25 °C, we have successfully characterized by electron paramagnetic resonance spectroscopy radicals formed by the reaction of each of the substrates 2- and 3-fluoropropene with the radicals •OH, •NH3+, •OSO3−, and •SO3−, respectively. With 2-and 3-fluoropropene, respectively, the radicals identified were of general formula CH2(X)ĊFCH3 and CH2(X)ĊHCH2F where -X is the added group, except that treatment of 3-fluoropropene with the TiCl3–H2O2 reaction system also yielded •CH2CH(X)CH2F. The results obtained are discussed in terms of the effect of the presence of the fluorine substituent on both the apparent reactivity of the substrate molecules towards the radical-generating systems and the spectroscopic properties of the radicals observed.

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Electron spin resonance studies. Part XXV. Reactions of the sulphate radical anion with organic compounds

Cited by 140 publications

References 0 publications

Degradation of p-chloroaniline by persulfate activated with ferrous sulfide ore particles

Degradation of p-chloroaniline by persulfate activated with ferrous sulfide ore particles

Decomposition of perfluorooctanoic acid by microwaveactivated persulfate: Effects of temperature, pH, and chloride ions

Electron paramagnetic resonance study of radicals derived from 2- and 3-fluoropropene

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