Reactions of phosphate radicals with substituted benzenes

Rosso, Janina A.; Nieto, F.; González, Mónica C.; Mártire, Daniel O.

doi:10.1016/s1010-6030(98)00266-4

Cited by 32 publications

(37 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Lifetime of phosphate radicals is about some millisecond (Rosso et al 1998) while lifetime of hydroxyl radicals is very shorter (about 70 ns), so phosphate radicals are more stable. In the literature, these radicals were mentioned to react on organic and inorganic pollutants (Eq.…”

Section: Effect Of Phosphatementioning

confidence: 99%

Sonochemical removal of naphthol blue black azo dye: influence of parameters and effect of mineral ions

Dalhatou

Pétrier

Laminsi

et al. 2013

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Sonochemical degradation at 278 kHz of naphthol blue black (NBB, a diazo dye widely used in the textile and soap industries) has been investigated. The effects of different parameters and the influence of mineral matrix (bicarbonates ions and phosphates ions) on its sonodegradation have been evaluated. The influence of parameters linked to the pollutant (concentration: 0.50-97.32 lmol L -1 ), to the technique (power: 20-100 W) and to the natural medium (pH 3-10.8; bicarbonate ions; phosphate ions) has been studied. The decolourisation rate of NBB increases when substrate concentration or ultrasound power increases. Bicarbonate ions at natural medium concentration (2.97 mmol L -1 ) have a positive influence for low pollutant concentration (0.5-2.0 lmol L -1 ), due to carbonate radicals. Phosphate ions may also improve the kinetics, but this effect depends on the pH domains. Furthermore, acid pH (pH 3) has a positive effect for high pollutant concentration, whereas basic pH (pH 10.8) has a positive influence at low pollutant concentration.

show abstract

Section: Effect Of Phosphatementioning

confidence: 99%

Sonochemical removal of naphthol blue black azo dye: influence of parameters and effect of mineral ions

Dalhatou

Pétrier

Laminsi

et al. 2013

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Peroxophosphates have a wide variety of applications in areas such as oxidations in organic synthesis [1,2], cosmetics [3,4], agriculture [5], wastewater treatment [6], and also as bleaching agents in the detergent industry [7,8]. Recently, the reaction mechanisms of these compounds have been studied and several synthesis routes have been proposed [9]-some of which are electrochemical.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

et al. 2007

View full text Add to dashboard Cite

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID : 3043 Abstract A new method for the synthesis of peroxomonophosphate, based on the use of boron-doped diamond electrodes, is described. The amount of oxidant electrogenerated depends on the characteristics of the supporting media (pH and solute concentration) and on the operating conditions (temperature and current density). Results show that the pH, between values of 1 and 5, does not influence either the electrosynthesis of peroxomonophosphate or the chemical stability of the oxidant generated. Conversely, low temperatures are required during the electrosynthesis process to minimize the thermal decomposition of peroxomonophosphate and to guarantee significant oxidant concentration. In addition, a marked influence of both the current density and the initial substrate is observed. This observation can be explained in terms of the contribution of hydroxyl radicals in the oxidation mechanisms that occur on diamond surfaces. In the assays carried out below the water oxidation potential, the generation of hydroxyl radicals did not take place. In these cases, peroxomonophosphate generation occurs through a direct electron transfer and, therefore, at these low current densities lower concentrations are obtained. On the other hand, at higher potentials both direct and hydroxyl radical-mediated mechanisms contribute to the oxidant generation and the process is more efficient. In the same way, the contribution of hydroxyl radicals may also help to explain the significant influence of the substrate concentration. Thus, the coexistence of both phosphate and hydroxyl radicals is required to ensure the generation of significant amounts of peroxomonophosphoric acid.

show abstract

“…HO . and SO 4 .À are able to oxidize most inorganic anions to secondary, less-reactive radicals [1]. In particular, the reactions with phosphate ions present in the aqueous matrix of contaminated waters yield phosphate radicals that may have unexpected consequences in the overall oxidation [2].…”

mentioning

confidence: 99%

“…In previous articles, we investigated the reactivity of phosphate radicals towards organic substrates [3 ± 5]. The bimolecular rate constants obtained for the reactions of several aromatic substrates with the phosphate radicals H 2 PO 4 . , HPO 4 .À , and PO 4 .2À…”

mentioning

confidence: 99%

“…correlate with the electron-withdrawing ability of the substituent, as expected from the electrophilicity of these radicals [3] [4]. The proposed mechanism [5] includes both electron transfer from the aromatics to the phosphate radicals and formation of an adduct between phosphate radicals and the aromatics, which may eliminate phosphate ions leading to hydroxycyclohexadienyl radicals or phosphite ions yielding phenoxyl radicals.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Reactions of Phosphate Radicals with Monosubstituted Benzenes. A Mechanistic Investigation

Rosso

Caregnato

Mora

et al. 2003

Helvetica Chimica Acta

View full text Add to dashboard Cite

show abstract

Reactions of phosphate radicals with substituted benzenes

Cited by 32 publications

References 16 publications

Sonochemical removal of naphthol blue black azo dye: influence of parameters and effect of mineral ions

Sonochemical removal of naphthol blue black azo dye: influence of parameters and effect of mineral ions

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

Reactions of Phosphate Radicals with Monosubstituted Benzenes. A Mechanistic Investigation

Contact Info

Product

Resources

About