The influence of phosphates on the decomposition of ozone in water: Chain process inhibition

Morozov, P. A.; Ершов, Б. Г.

doi:10.1134/s0036024410070101

Cited by 33 publications

(24 citation statements)

References 15 publications

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“…For convenience the buffer concentration in the plots is expressed in terms of ionic strength instead of the total molar concentration of phosphates. The experiments show that the buffer concentration has a stronger effect on ozone decomposition at acid conditions than in alkaline media, observation that contradicts the hypothesis about the reactivity of phosphates with hydroxyl radical (Morozov and Ershov 2010). The ozone decomposes faster in alkaline media because the high pH promotes the radical mechanism.…”

Section: Ionic Strength Effectsmentioning

confidence: 60%

“…The study of the influence of phosphates on ozone decomposition (Figure 9) shows the opposite results of the obtained by Morozov and Ershov (2010) at pH = 4.5, where they found a significant inhibition when the phosphates concentration was increased. In our case we observed an increase of reaction rate of decomposition when the phosphates concentration was increased.…”

Section: Discussionmentioning

confidence: 72%

“…The second protonation constant pK a2 (H 2 PO 4 − / HPO 4 2-) = 7.2 which is very close to the switching value of 7.4 for k' 1 defined in Equation (14). Then, it can be suggested that the participation of the phosphates are not as radical scavengers as it was proposed in other works (Biń et al 2013;Morozov and Ershov 2010) but as a proton source for the chemical reaction:…”

Section: Discussionmentioning

confidence: 96%

“…But the use of buffer solutions together with the ozone is not done without controversy. Recently, Morozov and Ershov (2010) reported that the presence of phosphates in solution inhibits the ozone decomposition in water.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Study of Ozone Decay in Homogeneous Phosphate-Buffered Medium

Ferre-Aracil

Cardona

Navarro-Laboulais

2015

Ozone: Science & Engineering

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The ozone decomposition reaction is analyzed in a homogeneous reactor through in-situ measurement of the ozone depletion. The experiments were carried out at pHs between 1 to 11 in H 2 PO 4 − /HPO 4 2-buffers at constant ionic strength (0.1 M) and between 5 and 35 • C. A kinetic model for ozone decomposition is proposed considering the existence of two chemical subsystems, one accounting for direct ozone decomposition leading to hydrogen peroxide and the second one accounting for the reaction between the hydrogen peroxide with the ozone to give different radical species. The model explains the apparent reaction order respect of the ozone for the entire pH interval. The decomposition kinetics at pH 4.5, 6.1, and 9.0 is analyzed at different ionic strength and the results suggest that the phosphate ions do not act as a hydroxyl radical scavenger in the ozone decomposition mechanism.

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Section: Ionic Strength Effectsmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Kinetic Study of Ozone Decay in Homogeneous Phosphate-Buffered Medium

Ferre-Aracil

Cardona

Navarro-Laboulais

2015

Ozone: Science & Engineering

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“…Lu found that oxidation of dichlorvos was inhibited by phosphate due to the scavenger effect of phosphates [19]. The influence of phosphates in ozone system has also been observed, and it is because phosphates can capture hydroxyl radicals and thereby inhibit the oxidation chain [20].…”

Section: Effect Of Ph On Toc Removalmentioning

confidence: 99%

Sub/supercritical water oxidation of high concentration wastewater from tall oil rosin production base

Miao

Wang

Shen

et al. 2016

Env Prog and Sustain Energy

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The sub/supercritical water oxidation (SCWO) of wastewater with high concentrations of pollutants from tall oil rosin production base was studied under the temperature range of 3208C-4208C and the pressure range of 11-25 MPa. The results showed that after pretreatment with Ca(OH) 2 for SO remained which inhibited the oxidation activity by reducing the concentration of hydroxyl radicals (•OH). Since the wastewater compounds were mainly cyclic organic materials, higher O 2 contents (stoichiometric ratio over 2.5) and temperatures (over 3808C) are favorable for TOC removal. With O 2 SR 5 2.5 and T 5 4208C, the TOC removal reached almost 100% (99.89%) in 30 min. A global kinetic model for TOC removal during SCWO treatment was built during the research. The kinetic data acquired through the model were fitted to a power-law function, and the data correlated well with the experimental data.

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