in this work, an indirect method for estimating the total amount and concentration of oxidative radicals in aqueous and slurry-phase Fenton's systems was developed. This method, based on the use of benzoic acid as probe compound, was applied for evaluating the effect of the operating conditions on the radicals amount produced, their production efficiency (i.e. moles of radicals generated per mole H2O2) and their concentration. A Rotatable Central Composite design (RCC) was used to select the operating conditions in order to get a statistically meaningful data set. Hydrogen peroxide and ferrous ion concentrations ranged between 0.2-1 mM and 0.2-0.5 mM, respectively; humic acid concentration between 0 and 15 mg/L, whereas the soil/water weight ratio in slurry-phase systems between 1:10 and 9:10. The probe compound concentration was 9 or 0.1 mM in experiments aimed to evaluate the total amount or concentration of oxidative radicals, respectively. The obtained results indicated that the amount of radicals generated in both aqueous and soil slurry Fenton's system increased with higher H2O2 concentration and, more specifically, that their production efficiency increased with increasing Fe(II):H2O2 molar ratio. Addition of dissolved organic compounds as humic acid did not notably affect the oxidative radicals amount and concentration. On the contrary, a one order of magnitude reduction in both radicals amount generated and concentration was observed when soil was added to the reaction environment. (C) 2008 Elsevier B.V. All rights reserved.

Ciotti, C., Baciocchi, R., Tuhkanen, T. (2009). Influence of the operating conditions on highly oxidative radicals generation in Fenton's systems. JOURNAL OF HAZARDOUS MATERIALS, 161(1), 402-408 [10.1016/j.jhazmat.2008.03.137].

Influence of the operating conditions on highly oxidative radicals generation in Fenton's systems

BACIOCCHI, RENATO;
2009-01-01

Abstract

in this work, an indirect method for estimating the total amount and concentration of oxidative radicals in aqueous and slurry-phase Fenton's systems was developed. This method, based on the use of benzoic acid as probe compound, was applied for evaluating the effect of the operating conditions on the radicals amount produced, their production efficiency (i.e. moles of radicals generated per mole H2O2) and their concentration. A Rotatable Central Composite design (RCC) was used to select the operating conditions in order to get a statistically meaningful data set. Hydrogen peroxide and ferrous ion concentrations ranged between 0.2-1 mM and 0.2-0.5 mM, respectively; humic acid concentration between 0 and 15 mg/L, whereas the soil/water weight ratio in slurry-phase systems between 1:10 and 9:10. The probe compound concentration was 9 or 0.1 mM in experiments aimed to evaluate the total amount or concentration of oxidative radicals, respectively. The obtained results indicated that the amount of radicals generated in both aqueous and soil slurry Fenton's system increased with higher H2O2 concentration and, more specifically, that their production efficiency increased with increasing Fe(II):H2O2 molar ratio. Addition of dissolved organic compounds as humic acid did not notably affect the oxidative radicals amount and concentration. On the contrary, a one order of magnitude reduction in both radicals amount generated and concentration was observed when soil was added to the reaction environment. (C) 2008 Elsevier B.V. All rights reserved.
2009
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore ICAR/03 - INGEGNERIA SANITARIA - AMBIENTALE
English
Con Impact Factor ISI
Fenton's system; oxidative radicals; rotatable central composite; soil
Ciotti, C., Baciocchi, R., Tuhkanen, T. (2009). Influence of the operating conditions on highly oxidative radicals generation in Fenton's systems. JOURNAL OF HAZARDOUS MATERIALS, 161(1), 402-408 [10.1016/j.jhazmat.2008.03.137].
Ciotti, C; Baciocchi, R; Tuhkanen, T
Articolo su rivista
File in questo prodotto:
File Dimensione Formato  
Influence-of-the-operating-conditions-on-highly-oxidative-radicals-generation-in-Fenton-s-systems_2009_Journal-of-Hazardous-Materials.pdf

accesso aperto

Dimensione 652.75 kB
Formato Adobe PDF
652.75 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/31530
Citazioni
  • ???jsp.display-item.citation.pmc??? 4
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 27
social impact