No Marked Kinetic Isotope Effect in the Peroxone (H2O2/D2O2+O3) Reaction: Mechanistic Consequences

Sein, Myint Myint; Golloch, Alfred; Schmidt, Torsten; Sonntag, Clemens von

doi:10.1002/cphc.200700493

Cited by 65 publications

(59 citation statements)

References 26 publications

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“…The lower pH does not favor the decomposition of O3 to OH• [14,24,28] that has a much greater reactivity with 1,4-dioxane than O3 [19]. Without the presence of H2O2, this chain mechanism of OH• production is initiated by hydroxide anions at higher pH values (Equations 3 and 4) [14,45,46], whereat the reactions proceeds over the conversion of O3• -into OH• (Equations 5 and 6) [47,48].…”

Section: Influence Of Phmentioning

confidence: 99%

“…The presence of H2O2 significantly enhanced the oxidation process at pH=7.0±0.1 (Table 2), as the H2O2 contributes to the generation of OH• through adduct formation (Equations 7 and 8) proceeded by the conversion of O3• -into OH• (Equations 5 and 6) [47,48]. HO2 -+ O3 ⇌ HO5 -(7) HO5 -→ HO2• + O3• -(8) As a consequence, the half-life of the compound was reduced considerably compared to the ozonation alone.…”

Section: O3/h2o2 Treatmentmentioning

confidence: 99%

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Removal of 1,4-dioxane from industrial wastewaters: Routes of decomposition under different operational conditions to determine the ozone oxidation capacity

Barndõk

Cortijo

Hermosilla

et al. 2014

Journal of Hazardous Materials

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This paper denotes the importance of operational parameters for the feasibility of ozone (O3) oxidation for the treatment of wastewaters containing 1,4-dioxane. Results show that O3 process, which has formerly been considered insufficient as a sole treatment for such wastewaters, could be a viable treatment for the degradation of 1,4-dioxane at the adequate operation conditions. The treatment of both synthetic solution of 1,4-dioxane and industrial wastewaters, containing 1,4-dioxane and 2-methyl-1,3-dioxolane (MDO), showed that about 90% of chemical oxygen demand can be removed and almost a total removal of 1,4-dioxane and MDO is reached by O3 at optimal process conditions. Data from on-line Fourier transform infrared spectroscopy provides a good insight to its different decomposition routes that eventually determine the viability of degrading this toxic and hazardous compound from industrial waters. The degradation at pH>9 occurs faster through the formation of ethylene glycol as a primary intermediate; whereas the decomposition in acidic conditions (pH<5.7) consists in the formation and slower degradation of ethylene glycol diformate.

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Section: Influence Of Phmentioning

confidence: 99%

Section: O3/h2o2 Treatmentmentioning

confidence: 99%

Removal of 1,4-dioxane from industrial wastewaters: Routes of decomposition under different operational conditions to determine the ozone oxidation capacity

Barndõk

Cortijo

Hermosilla

et al. 2014

Journal of Hazardous Materials

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“…However, in real water, the formation of less than one mol of HO° for one mol of H2O2 consumed is always observed (Fischbacher et al, 2013;Merényi et al, 2010a;Staehelin and Hoigne, 1982). Thus, more recently, the ozone decomposition mechanism has been extensively revisited assuming the reversible formation of the adduct HO5 -which is further decomposed into HO2° + O3 -° and 2 O3 + HO - (Merényi et al, 2010a;Merényi et al, 2010b;Sein et al, 2007) :…”

Section: Introductionmentioning

confidence: 99%

“…No scavenger was used. More recently, Sein et al (2007) found a value of the apparent reaction rate constant equal to (4.8 ± 1.0)×10 6 L mol -1 s -1 at 20 ± 1°C from the ozone decay measured by a spectrophotometer using a large excess (0.01 mol L -1…”

mentioning

confidence: 99%

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Determination by reactive absorption of the rate constant of the ozone reaction with the hydroperoxide anion

Biard

Dang

Couvert

2017

Chemical Engineering Research and Design

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International audienceThe reaction rate constant between the hydroperoxide anion (HO2−) and molecular ozone was evaluated from the reactive absorption method in the range of temperature from 20 to 35 °C. This reaction is crucial in the initiation step of the ozone decomposition, especially using the peroxone process which combines ozone and hydrogen peroxide in solution. A stirred-cell operated semi-continuously was used for this purpose. A high initial concentration of tert-butanol (0.05 mol L−1) was applied to efficiently scavenge all radicals and to avoid any parasite reaction. Based on the dissolved H2O2 concentration decreasing and the outlet ozone concentration time-course, the stoichiometry of the initiation reaction was determined, with one mol of H2O2 consumed per mol of ozone transferred. The chemical conditions were thoroughly selected to reach a fast pseudo-first order absorption regime. The reaction rate constant increased from 1.91 × 106–2.40 × 106 L mol−1 s−1 at 20 °C to 5.68 × 106–7.31 × 106 L mol−1 s−1 at 35 °C

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Water, 6. Treatment by Oxidation Processes

Lutze

2016

Ullmann's Encyclopedia of Industrial Chemistry

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No Marked Kinetic Isotope Effect in the Peroxone (H₂O₂/D₂O₂+O₃) Reaction: Mechanistic Consequences

Cited by 65 publications

References 26 publications

Removal of 1,4-dioxane from industrial wastewaters: Routes of decomposition under different operational conditions to determine the ozone oxidation capacity

Removal of 1,4-dioxane from industrial wastewaters: Routes of decomposition under different operational conditions to determine the ozone oxidation capacity

Determination by reactive absorption of the rate constant of the ozone reaction with the hydroperoxide anion

Water, 6. Treatment by Oxidation Processes

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