Unexpected frequency effects on the rate of oxidative processes induced by ultrasound

Pétrier, Christian; Jeunet, A.; Luche, Jean Louis; Reverdy, Gilbert

doi:10.1021/ja00034a077

Cited by 294 publications

(151 citation statements)

References 1 publication

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“…4-NPA is liable to undergo OH-radicalinduced reactions like the one shown in Scheme 3 [30]. The production of radicals depends primarily on the frequency of the ultrasound [51][52][53][54]. Tauber et al [30] studied at 321 kHz the sonolysis of 4-NPA in an argon-saturated aqueous solution (pH 6.5, 25°C, the reaction vessel being immersed in a water-filled sonicator, 85 W).…”

Section: Sonolytic Degradation Of the Estermentioning

confidence: 99%

Effect of ultrasound on ester hydrolysis in aqueous ethanol

Tuulmets

Salmar

2001

Ultrasonics Sonochemistry

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Section: Sonolytic Degradation Of the Estermentioning

confidence: 99%

Effect of ultrasound on ester hydrolysis in aqueous ethanol

Tuulmets

Salmar

2001

Ultrasonics Sonochemistry

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“…In this frequency, the generated hydroxyl radicals are easily transferred away from the bubbles [7,52,53,54]. The high-frequency damages include dislocation of the cell membrane, which often leads to intracellular content leakage, due to the disruption of the cell wall integrity [55,56].…”

Section: Results Of the Step-wise Construction Of The Joint Treatmentmentioning

confidence: 99%

Ultrasound enhancement of near-neutral photo-Fenton for effective E. coli inactivation in wastewater

Giannakis

Papoutsakis

Darakas

et al. 2015

Ultrasonics Sonochemistry

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a b s t r a c tIn this study, we attempt for the first time to couple sonication and photo-Fenton for bacterial inactivation of secondary treated effluent. Synthetic wastewater was subjected to sequential high-frequency/low power sonication, followed by mild photo-Fenton treatment, under a solar simulator. It was followed by the assessment of the contribution of each component of the process (Fenton, US, hv) towards the removal rate and the long-term survival; sunlight greatly improved the treatment efficiency, with the coupled process being the only one to yield total inactivation within the 4-h period of treatment. The short-term beneficial disinfecting action of US and its detrimental effect on bacterial survival in long term, as well as the impact of light addition were also revealed. Finally, an investigation on the operational parameters of the process was performed, to investigate possible improvement and/or limitations of the coupled treatment; 3 levels of each parameter involved (hydraulic, environmental, US and Fenton) were tested. Only H 2 O 2 increased improved the process significantly, but the action mode of the joint process indicated potential cost-effective solutions towards the implementation of this method.

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“…Both the intensity and the emission spectra of sonoluminescence are altered when cavitation is induced at different ultrasonic frequencies. The mechanism by which ultrasonic frequency enhances reaction rates has not been definitively established [54] and normally the explanations found in literature are partial and specifically related to the rate constants of OH · production and the formation of H 2 O 2 by coupling of OH · radicals [64,71]. A critical qualitative analysis on the influence of the frequency has been proposed by Hua and Hoffmann [72].…”

Section: Influence Of the Ultrasonic Frequencymentioning

confidence: 99%

Sonochemical Treatment of Water Polluted by Chlorinated Organocompounds. A Review

González-Garcı́a

Sáez

Tudela

et al. 2010

Water

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As one of several types of pollutants in water, chlorinated compounds have been routinely subjected to sonochemical analysis to check the environmental applications of this technology. In this review, an extensive study of the influence of the initial concentration, ultrasonic intensity and frequency on the kinetics, degradation efficiency and mechanism has been analyzed. The sonochemical degradation follows a radical mechanism which yields a very wide range of chlorinated compounds in very low concentrations. Special attention has been paid to the mass balance comparing the results from several analytical techniques. As a conclusion, sonochemical degradation alone is not an efficient treatment to reduce the organic pollutant level in waste water.

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Unexpected frequency effects on the rate of oxidative processes induced by ultrasound

Cited by 294 publications

References 1 publication

Effect of ultrasound on ester hydrolysis in aqueous ethanol

Effect of ultrasound on ester hydrolysis in aqueous ethanol

Ultrasound enhancement of near-neutral photo-Fenton for effective E. coli inactivation in wastewater

Sonochemical Treatment of Water Polluted by Chlorinated Organocompounds. A Review

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