Henry's law constant for the ozone-water system

Sotelo, J.L.; Beltrán, Fernando J.; Benítez, F. Javier; Beltrán‐Heredia, J.

doi:10.1016/0043-1354(89)90186-3

Cited by 256 publications

(151 citation statements)

References 10 publications

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“…However, over 1,400 rpm, no further significant increase in the mass-transfer coefficient was observed, a maximum value having thus been reached. Similar results were reported by Sotelo et al (1989) for a conventional agitated tank.…”

Section: Parameters Aflecting the Mass Transfer Of Ozonesupporting

confidence: 92%

“…The ozone sensor was placed at the bottom of the vessel where the bubbles were being kept from hitting the tip of the sensor. Because of the extremely low solubility of ozone, the resistance arising from gas-film diffusion can be neglected with respect to that of liquid-film diffusion, thus limiting the mass transfer rate of ozone from the gas into liquid phase only by liquid-film diffusion (Sotelo et al, 1989;Gould and Ulirsch, 1992;Munter et al, 1993). At 25"C, pH 2, and mixing times of not more than 15 seconds by fast agitation (Hsu and Huang, 1996), and assuming thorough mixing, the effect of the self-decomposition of ozone on its mass transfer can be neglected (Sotelo et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

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Ozone transfer with optimal design of a new gas‐induced reactor

Hsu¹,

Huang²

1997

AIChE Journal

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Section: Parameters Aflecting the Mass Transfer Of Ozonesupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Ozone transfer with optimal design of a new gas‐induced reactor

Hsu¹,

Huang²

1997

AIChE Journal

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“…33 Moreover, it is reported that the dissolved ozone concentration in water decreases from 4.3 Â 10 À4 mol/L at pH 4 to 1.5 Â 10 À4 mol/L at pH 10. 34 It is clear from the above facts that the efficiency of ozone treatment is maximum up to pH 4 and then decreases, irrespective of its availability as ozone or OH8. A point to be noted here is that though OH8 has higher oxidation potential than ozone, the efficiency of the treatment in the alkaline region is lower than acidic region, since lesser amount of dissolved ozone is available for the generation of OH8.…”

Section: Effect Of Phmentioning

confidence: 94%

Effects of ozone treatment on the properties of raw and degummed tassar silk fabrics

Sargunamani¹,

Selvakumar²

2007

J of Applied Polymer Sci

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Ozone is a powerful oxidizing agent and is widely used in various applications, which includes bleaching of cotton. Literature on the action of ozone on silk is almost not available. Therefore, an elaborate study was carried out to understand the effects of process parameters in the ozone treatment of raw and degummed tassar silk fabrics on their properties. The study was extended with a view to compare the ozone treatment with soap degumming and hydrogen peroxide treatment carried out on raw and degummed tassar silk fabrics, respectively. The treatment results in improvement in pliability of the fabric and reduction in color. Decrease in breaking strength, breaking elongation, and weight as well an increase in amino group content is also experienced by the material. The results obtained are substantiated with tyrosine content, scanning electron micrographs, and infrared spectroscopy of the treated materials. The effect of pH on the treatment is maximum upto pH 4 and then decreases. The treatment is more severe when the wet pickup used is 50% compared to 10 and 100%. With respect to treatment time, though the severity increases with time, it is maximum during the first 10 min of the treatment. Soap degumming of raw silk fabric results in little higher yellowness index and lesser loss in breaking strength and elongation and flexural rigidity compared to that of ozone-treated material. There is not much of difference between ozone and hydrogen peroxide treatments of degummed silk fabric, except for the lesser yellowness index obtained in the latter case.

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“…7a), and low-ozone episodes were only observed in high RH (> 70 %) conditions. According to Altimir et al (2006), moisture in the air enhances the total ozone deposition, possibly due to the high solubility of ozone in water (Sotelo et al, 1989). At RH levels higher than 70 % almost all surfaces of foliage are covered with thin water film, which efficiently adsorbs ozone and decouples the stomatal conductance from O 3 fluxes, forming a significant non-stomatal sink for ozone (Altimir et al 2006).…”

Section: Features In Low-ozone Episodesmentioning

confidence: 99%

Observations of ozone depletion events in a Finnish boreal forest

et al. 2018

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Abstract. We investigated the concentrations and vertical profiles of ozone over a 20-year period (1996-2016) at the SMEAR II station in southern Finland. Our results showed that the typical daily median ozone concentrations were in the range of 20-50 ppb with clear diurnal and annual patterns. In general, the profile of ozone concentrations illustrated an increase as a function of heights. The main aim of our study was to address the frequency and strength of ozone depletion events at this boreal forest site. We observed more than a thousand of 10 min periods at 4.2 m, with ozone concentrations below 10 ppb, and a few tens of cases with ozone concentrations below 2 ppb. Among these observations, a number of ozone depletion events that lasted for more than 3 h were identified, and they occurred mainly in autumn and winter months. The low ozone concentrations were likely related to the formation of a low mixing layer under the conditions of low temperatures, low wind speeds, high relative humidities and limited intensity of solar radiation.

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Henry's law constant for the ozone-water system

Cited by 256 publications

References 10 publications

Ozone transfer with optimal design of a new gas‐induced reactor

Ozone transfer with optimal design of a new gas‐induced reactor

Effects of ozone treatment on the properties of raw and degummed tassar silk fabrics

Observations of ozone depletion events in a Finnish boreal forest

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