Pulse radiolysis study of concentrated phosphoric acid solutions

Jiang, Peiyun; Katsumura, Yosuke; Domae, M.; Ishikawa, Kenichi L.; Nagaishi, Ryuji; Ishigure, Kenkichi; Yoshida, Yasuhiko

doi:10.1039/ft9928803319

Cited by 34 publications

(40 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This indicates an increase in the oxidant potential upon protonation and this is consistent with the results observed in the voltammetric study. However, accurate values could not be found in the literature (rather some estimations of the values that confirm these observations [39]). …”

Section: Voltammetric Studymentioning

confidence: 52%

“…According to the literature [39,40], the reduction potentials of these phosphate radicals can differ significantly and it has been reported that (PO 4 2-) Á oxidizes I -rapidly, (HPO 4 -) Á can also oxidize Br -and (H 2 PO 4 ) Á can even oxidize Cl -. This indicates an increase in the oxidant potential upon protonation and this is consistent with the results observed in the voltammetric study.…”

Section: Voltammetric Studymentioning

confidence: 99%

“…7) or react with hydroxyl radicals generated by water oxidation to form peroxomonophosphoric acid (Eq. 8) [2,39,41,42].…”

Section: Voltammetric Studymentioning

confidence: 99%

See 2 more Smart Citations

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

Section: Voltammetric Studymentioning

confidence: 52%

Section: Voltammetric Studymentioning

confidence: 99%

See 1 more Smart Citation

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

et al. 2007

View full text Add to dashboard Cite

show abstract

“…The later combination of peroxophosphate radicals allows the production of the more stable peroxodiphosphate anion (Eq. 2) [36].…”

Section: Resultsmentioning

confidence: 98%

Synthesis of novel oxidants by electrochemical technology

et al. 2009

View full text Add to dashboard Cite

In this work it has been studied the electrochemical production of different oxidants with conductivediamond anodes. This technology was found to allow the production of stable oxidants that can not be easily synthesized using other electrodes or by other more usual techniques. Thus, it has been found that monoperoxophosphoric acid, and peroxodiphosphate, peroxodisulphate and ferrate salts can be easily produced by this technology, when the right operation conditions are used. In contrast, the production of pure hypochlorite is not favoured, because this technology leads to the formation of a mixture of hypochlorite with other oxoanions of chlorine in a higher oxidation state, particularly chlorates and perchlorates, which seems to be the final product in these electrolyses. The production of perbromates salts has also been pointed, although in this case only preliminary results are shown. In every case, it has been observed two marked trends in the process efficiency as function of the current density applied. This fact can be explained in terms of the contribution of hydroxyl radicals in the oxidation mechanisms that occur on diamond surfaces. Results obtained in this work also allow explaining the influence of the electrolyte salt on the efficiency of the electrochemical oxidation of wastewaters.

show abstract

“…As compared with carbonate or hydrocarbonate ions the reactivity of sulfate or hydrosulfate anions is rather different (Jiang et al, 1992 …”

Section: Radiolysis Of Aqueous Solutions Relevant To Nuclear Waste Prmentioning

confidence: 99%

Radiation Induced Corrosion of Nuclear Fuel and Materials

Čuba¹,

Múčka²,

Pospı́šil³

2012

Advances in Nuclear Fuel

View full text Add to dashboard Cite

Pulse radiolysis study of concentrated phosphoric acid solutions

Cited by 34 publications

References 18 publications

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

Synthesis of novel oxidants by electrochemical technology

Radiation Induced Corrosion of Nuclear Fuel and Materials

Contact Info

Product

Resources

About