Solubility of Ozone and Kinetics of Its Decomposition in Aqueous Chloride Solutions

Abstract

Solubility of ozone and kinetics of its decomposition in aqueous solutions of NaCl and NaCl + HCl have been investigated as functions of solution composition, electrolyte concentration, and temperature. A methodology has been developed, in which dissolved O3 concentration was measured by a direct spectrophotometric technique by absorbance at 260 nm, with ozone decomposition in the sample and the presence of other substances also absorbing light at 260 nm being taken into account. For solutions with concentrations of Cl– 0–2 M and H+ 0–0.5 M, the solubility coefficient (L O3) and Henry’s law constant of ozone (K H) have been determined in the temperature range 20–40 °C, as well as the kinetic order and apparent rate constants of O3 decomposition (at 20 ± 1 °C). Formulas have been obtained for calculating L O3 and K H for various values of temperature and electrolyte concentration. An equation is presented for computing the rate constant of ozone reaction with chloride ion in aqueous solution via the mechanism of oxygen atom transfer as a function of temperature and concentration of H+ ions.

Mechanism and Kinetic Model of Chlorate and Perchlorate Formation during Ozonation of Aqueous Chloride Solutions

“…In the absence of such data, the literature values for 20–25 °C were used, without adjustment for temperature. The equilibrium constants (acid dissociation constants and Henry’s constants) conform to the ionic strength of 1 M, which is consistent with the experimental conditions. , The value of the true Henry’s law constant of ozone, H O3 = 0.18, is taken from ref . Below, we describe the kinetic characteristics of key steps in the set of reactions.…”

Revisit the Role of Salinity in Heterogeneous Catalytic Ozonation: The Trade-Off between Reaction Inhibition and Mass Transfer Enhancement

“…Besides, due to the salting-out effects, the saturated ozone concentration also decreased from 0.284 mM without salinity to 0.225 mM under 50 g/L salinity. The ozone solubility coefficient ( L O 3 ) showed a negative relationship with temperature ( T ) and Cl – concentration ( C ( Cl – )), which was shown in eq . Therefore, the presence of high salinity greatly reduced the ozone solubility, accelerated the futile consumption of ozone, and led to the rapid decrease of the bulk • OH concentration. log 10 ⁡ L O 3 = − 4.26 + 1100 T − 0.226 × C false( C l − false) …”

“…The ozone solubility coefficient (L Od 3 ) showed a negative relationship with temperature (T) and Cl − concentration (C(Cl − )), which was shown in eq 8. 39 Therefore, the presence of high salinity greatly reduced the ozone solubility, accelerated the futile consumption of ozone, and led to the rapid decrease of the bulk The decrease of the bulk • OH concentration could be ascribed to the decrease of ozone dissolution, the futile consumption of ozone, and the scavenging of • OH by Cl − , whose contribution to the • OH concentration decrease could…”

Potential therapeutic effect of oxygen-ozone in controlling of COVID-19 disease

“…Depending on temperature and pressure, about 50 mL of ozone gas dissolves in 100 mL of water, while only 4 mL of oxygen dissolves in 100 mL of water. 24 Some researchers prefer the usage of extracorporeally ozonated autologous blood transfusion with a volume of 100–200 mL, which is extensively recognized as a major autohemotherapy. 25 Different procedures for major auto-hemotherapy typically use only 100–200 mL of blood.…”