Intensification of hydroxyl radical production in sonochemical reactors

Anand G. Chakinala, Parag R. Gogate, Arthur E. Burgess, David H. Bremner

Research output: Contribution to journalArticle

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Abstract

The efficacy of sonochemical reactors in chemical processing applications has been well established in the laboratory scale of operation though at a given set of operating parameters and no efforts have been directed in terms of maximizing the free radical production. In the present work, the effect of different operating parameters viz. pH, power dissipation into the system, effect of additives such as air, haloalkanes, titanium dioxide, iron and oxygen on the extent of hydroxyl radical formation in a sonochemical reactor have been investigated using salicylic acid dosimetry. Possible mechanisms for oxidation of salicylic acid in the presence of different additives have also been established. It has been observed that acidic conditions under optimized power dissipation in the presence of iron powder and oxygen result in maximum liberation of hydroxyl radicals as quantified by the kinetic rate constant for production of 2,5- and 2,3-dihydroxybenzoic acid. The study has enabled the optimization of the conditions for maximum efficacy of sonochemical reactors where free radical attack is the controlling mechanism for the chemical processing applications.
Original languageEnglish
Pages (from-to)509-514
Number of pages6
JournalUltrasonics Sonochemistry
Volume14
Issue number5
DOIs
Publication statusPublished - Jul 2007

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Salicylic acid
Salicylic Acid
hydroxyl radicals
Free radicals
Hydroxyl Radical
Free Radicals
Energy dissipation
Iron
reactors
Oxygen
free radicals
Iron powder
acids
dissipation
Processing
Powders
Titanium dioxide
Dosimetry
iron
Rate constants

Cite this

Chakinala, Anand G. ; Gogate, Parag R. ; Burgess, Arthur E. ; Bremner, David H. / Intensification of hydroxyl radical production in sonochemical reactors. In: Ultrasonics Sonochemistry. 2007 ; Vol. 14, No. 5. pp. 509-514.
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Intensification of hydroxyl radical production in sonochemical reactors. / Chakinala, Anand G.; Gogate, Parag R.; Burgess, Arthur E.; Bremner, David H.

In: Ultrasonics Sonochemistry, Vol. 14, No. 5, 07.2007, p. 509-514.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Chakinala, Anand G.

AU - Gogate, Parag R.

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AU - Bremner, David H.

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AB - The efficacy of sonochemical reactors in chemical processing applications has been well established in the laboratory scale of operation though at a given set of operating parameters and no efforts have been directed in terms of maximizing the free radical production. In the present work, the effect of different operating parameters viz. pH, power dissipation into the system, effect of additives such as air, haloalkanes, titanium dioxide, iron and oxygen on the extent of hydroxyl radical formation in a sonochemical reactor have been investigated using salicylic acid dosimetry. Possible mechanisms for oxidation of salicylic acid in the presence of different additives have also been established. It has been observed that acidic conditions under optimized power dissipation in the presence of iron powder and oxygen result in maximum liberation of hydroxyl radicals as quantified by the kinetic rate constant for production of 2,5- and 2,3-dihydroxybenzoic acid. The study has enabled the optimization of the conditions for maximum efficacy of sonochemical reactors where free radical attack is the controlling mechanism for the chemical processing applications.

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