Destruction of Polycyclic Aromatic Hydrocarbons with Ultrasound

D’Silva, Arthur P.; Laughlin, Steven K.; Weeks, S.J.; Buttermore, W.H.

doi:10.1080/10406639008034756

Cited by 18 publications

(9 citation statements)

References 11 publications

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“…After 20 min, the amount of anthracene absorbed by the fiber began to decrease, and it is believed this was due to destruction of the analyte molecule. Using approximately 50 W of power, previous authors have used sonication to destroy PAH molecules, specifically benzo [a] pyrene (23). In this study, a sonication power of 12 W was used, and there was no effect on any of the compounds with the exception of anthracene.…”

Section: Resultsmentioning

confidence: 96%

Rapid determination of polyaromatic hydrocarbons and polychlorinated biphenyls in water using solid-phase microextraction and GC/MS

Potter¹,

Pawliszyn²

1994

Environ. Sci. Technol.

374

171

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Section: Resultsmentioning

confidence: 96%

Rapid determination of polyaromatic hydrocarbons and polychlorinated biphenyls in water using solid-phase microextraction and GC/MS

Potter¹,

Pawliszyn²

1994

Environ. Sci. Technol.

374

171

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“…Recently, the role of supercritical water during cavitation has been reported (15). Some studies have been done on the application of ultrasound to the degradation of contaminant substances in water, for example, polycyclic aromatic hydrocarbons (16), parathion (17), geosmin (18), diverse phenols (19)(20)(21), hydrogen sulfide (22), chlorinated hydrocarbons (23)(24)(25)(26), and chlorofluorcarbons (27,28) have been investigated. In the course of our studies on the chemical effects of ultrasound (18,25,26,28,29), we have found that chlorinated hydrocarbons and chlorofluorocarbons were readily decomposed by a sonochemical method, and we report here the results of sonochemical decomposition of monohydroxybenzoic acids (HBAs), 3,4-dihydroxybenzoic acid (3,4-DHBA), 3,4,5-trihydroxybenzoic acid (gallic acid) (GA), tannic acid (TA), and both reagent and prepared humic acids (HAs) in water with our interest focusing on the feasibility of sonochemical destruction of these nonvolatile substances of environmental concern.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of Hydroxybenzoic and Humic Acids in Water by Ultrasonic Irradiation

Nagata

Hirai

Bandow

et al. 1996

Environ. Sci. Technol.

105

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Sonochemical decomposition of a series of hydroxybenzoic acids such as monohydroxy-, 3,4-dihydroxy-, 3,4,5-trihydroxybenzoic acids, tannic acid, and reagent and prepared humic acids in water under argon or air atmosphere was investigated. The decomposition followed first-order kinetics at initial stage, and initial rates were in the range of 1.9-5.1 µM min -1 under argon and 1.9-16.4 µM min -1 under air. The rates of OH radical formation in the sonolysis of water were estimated to be 20 µM min -1 under argon and 15 µM min -1 under air from the yield of Fe(III) formed by the sonication of Fe(II) solution. The decomposition of 3-hydroxybenzoic acid was almost completely inhibited by the addition of 0.1 mM t-BuOH, which is an effective scavenger of OH radicals. It is suggested that, in sonolysis under argon, the main sonochemical decomposition of the substances employed in this study proceeds via reactions with OH radicals in the bulk solution and that the contribution of thermal decomposition in cavitation bubbles or the interfacial region (between the bubbles and bulk solution) is small. In the sonolysis under air atmosphere, the role of oxygen was small in monohydroxybenzoic acids but increased with increasing numbers of OH groups substituted on the aromatic ring, suggesting the occurrence of decomposition of polyhydroxybenzoic acids induced by oxygen molecules at the interface. The chloroform formation potentials of 3-hydroxybenzoic acid and humic acids decreased due to the sonication, but the reduction in the potential was less than the corresponding amounts of decomposition of the starting substances.

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“…Some authors document the reproducibility and efficiency of ultrasonic extraction. − On the other hand it is well-known that imploding cavitation bubbles inside a liquid concentrate the acoustic energy in a small volume, resulting in high pressures and temperatures for a very short time. , Solvent radicals formed during the cavitation might react with some of the PAH. The sonolytical decomposition of PAH may be useful as a means for their destruction …”

mentioning

confidence: 99%

Decomposition of Acenaphthylene by Ultrasonic Irradiation

Leonhardt

Stahl

1998

Anal. Chem.

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Polycyclic aromatic hydrocarbons were extracted from a soil sample using ultrasound and dichloromethane-, cyclohexane-, and toluene-water mixtures. It was found that when dichloromethane is used as an extractant, acenaphthylene reacts with the solvent. Several chlorinated and oxygenated derivatives were identified. The results show that chlorinated solvents should be avoided because of their sonolytic decomposition. Particularly unsaturated nonaromatic compounds might react with intermediate decomposition radicals of the solvent.

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Destruction of Polycyclic Aromatic Hydrocarbons with Ultrasound

Cited by 18 publications

References 11 publications

Rapid determination of polyaromatic hydrocarbons and polychlorinated biphenyls in water using solid-phase microextraction and GC/MS

Rapid determination of polyaromatic hydrocarbons and polychlorinated biphenyls in water using solid-phase microextraction and GC/MS

Decomposition of Hydroxybenzoic and Humic Acids in Water by Ultrasonic Irradiation

Decomposition of Acenaphthylene by Ultrasonic Irradiation

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