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

Research output: Contribution to journalArticle

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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
StatePublished - Apr 2008

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cavitation flow
hydrodynamics
Cavitation
Hydrodynamics
2,4-Dichlorophenoxyacetic Acid
Acoustics
Alphavirus
hydrogen peroxide
removal
iron
acids
acoustics
Hydrogen peroxide
Ultrasonics
Removal
Acids
Hydrogen Peroxide
Iron
Aerobiosis
hydroxyl radicals

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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, Vol. 15, No. 4, 04.2008, p. 416-419.

Research output: Contribution to journalArticle

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title = "Mineralisation of 2,4-dichlorophenoxyacetic acid by acoustic or hydrodynamic cavitation in conjunction with the advanced Fenton process",
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.",
author = "Bremner, {David H.} and {Di Carlo}, Stefano and Chakinala, {Anand G.} and Giancarlo Cravotto",
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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

PY - 2008/4

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N2 - 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.

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.

U2 - 10.1016/j.ultsonch.2007.06.003

DO - 10.1016/j.ultsonch.2007.06.003

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VL - 15

SP - 416

EP - 419

JO - Ultrasonics Sonochemistry

T2 - Ultrasonics Sonochemistry

JF - Ultrasonics Sonochemistry

SN - 1350-4177

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