Mineralisation of 2,4-dichlorophenoxyacetic acid by acoustic or hydrodynamic cavitation in conjunction with the advanced Fenton process

David H. Bremner, Stefano Di Carlo, Anand G. Chakinala, Giancarlo Cravotto

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Abstract

The mineralisation of 2,4-dichlorophenoxyacetic acid (2,4-D) in the presence of zero-valent iron and hydrogen peroxide (the Advanced Fenton process – AFP) whilst being subjected to acoustic or hydrodynamic cavitation is reported. If the reaction is merely stirred then there is 57% removal of TOC whilst on irradiation the figure is 64% although the latter reaction is more rapid. Use of ultrasound alone results in only 11% TOC removal in 60 min of treatment time. Addition of iron powder marginally enhances the extent of degradation but an appreciable increase is observed in the presence of hydrogen peroxide which acts as a source for hydroxyl radicals by Fenton chemistry as well as by dissociation in the presence of ultrasound. The use of hydrodynamic cavitation in conjunction with the advanced Fenton process has also been found to be a useful tool for continuous remediation of water contaminated with 2,4-D. After 20 minutes of treatment the residual TOC is reduced to 30% and this probably represents the remaining highly recalcitrant small organic molecules.
Original languageEnglish
Pages (from-to)416-419
Number of pages4
JournalUltrasonics Sonochemistry
Volume15
Issue number4
DOIs
Publication statusPublished - Apr 2008

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2,4-Dichlorophenoxyacetic Acid
Hydrodynamics
cavitation flow
hydrogen peroxide
Cavitation
Acoustics
Hydrogen peroxide
Ultrasonics
hydrodynamics
iron
Hydrogen Peroxide
Iron powder
acids
acoustics
Acids
hydroxyl radicals
peroxides
Iron
Remediation
Irradiation

Cite this

Bremner, David H. ; Di Carlo, Stefano ; Chakinala, Anand G. ; Cravotto, Giancarlo. / Mineralisation of 2,4-dichlorophenoxyacetic acid by acoustic or hydrodynamic cavitation in conjunction with the advanced Fenton process. In: Ultrasonics Sonochemistry. 2008 ; Vol. 15, No. 4. pp. 416-419.
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abstract = "The mineralisation of 2,4-dichlorophenoxyacetic acid (2,4-D) in the presence of zero-valent iron and hydrogen peroxide (the Advanced Fenton process – AFP) whilst being subjected to acoustic or hydrodynamic cavitation is reported. If the reaction is merely stirred then there is 57{\%} removal of TOC whilst on irradiation the figure is 64{\%} although the latter reaction is more rapid. Use of ultrasound alone results in only 11{\%} TOC removal in 60 min of treatment time. Addition of iron powder marginally enhances the extent of degradation but an appreciable increase is observed in the presence of hydrogen peroxide which acts as a source for hydroxyl radicals by Fenton chemistry as well as by dissociation in the presence of ultrasound. The use of hydrodynamic cavitation in conjunction with the advanced Fenton process has also been found to be a useful tool for continuous remediation of water contaminated with 2,4-D. After 20 minutes of treatment the residual TOC is reduced to 30{\%} and this probably represents the remaining highly recalcitrant small organic molecules.",
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Mineralisation of 2,4-dichlorophenoxyacetic acid by acoustic or hydrodynamic cavitation in conjunction with the advanced Fenton process. / Bremner, David H.; Di Carlo, Stefano; Chakinala, Anand G.; Cravotto, Giancarlo.

In: Ultrasonics Sonochemistry, Vol. 15, No. 4, 04.2008, p. 416-419.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mineralisation of 2,4-dichlorophenoxyacetic acid by acoustic or hydrodynamic cavitation in conjunction with the advanced Fenton process

AU - Bremner, David H.

AU - Di Carlo, Stefano

AU - Chakinala, Anand G.

AU - Cravotto, Giancarlo

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AB - The mineralisation of 2,4-dichlorophenoxyacetic acid (2,4-D) in the presence of zero-valent iron and hydrogen peroxide (the Advanced Fenton process – AFP) whilst being subjected to acoustic or hydrodynamic cavitation is reported. If the reaction is merely stirred then there is 57% removal of TOC whilst on irradiation the figure is 64% although the latter reaction is more rapid. Use of ultrasound alone results in only 11% TOC removal in 60 min of treatment time. Addition of iron powder marginally enhances the extent of degradation but an appreciable increase is observed in the presence of hydrogen peroxide which acts as a source for hydroxyl radicals by Fenton chemistry as well as by dissociation in the presence of ultrasound. The use of hydrodynamic cavitation in conjunction with the advanced Fenton process has also been found to be a useful tool for continuous remediation of water contaminated with 2,4-D. After 20 minutes of treatment the residual TOC is reduced to 30% and this probably represents the remaining highly recalcitrant small organic molecules.

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DO - 10.1016/j.ultsonch.2007.06.003

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