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Sonochemical destruction of nonylphenol: Effects of pH and hydroxyl radical scavengers by Nilsun H. Ince; Isil Gültekin; Gökce Tezcanli-Güyer is a Environmental Science article available to read on EtoBox.

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Nonylphenols are water-stable endocrine disrupting compounds that inhibit the growth of sewage bacteria in biological processes. The study describes the decomposition of 4-n-nonylphenol (NP) in water by 20 kHz ultrasound with emphasis on the impacts of pH, concentration and OH • scavengers. It was found that the rate of degradation was accelerated by alkalinization, but more so by the addition of hydroxide alkalinity than carbonate. The addition of low doses of CO 3 2-and t-butyl alcohol as strong scavengers of OH • was also found to accelerate the decomposition of NP. The observation was attributed to the generation of reactive CO 3 2-• and CH 3 • via pyrolysis of the additives in the cavity bubbles. The results also revealed that NP did not compete with OH • scavenging agents when their relative concentration was low. In case of high frequency sonication (861 kHz) the competition was slightly effective (slowed down degradation) at an identical dose of t-butyl alcohol. The difference was attributed to shorter bubble life time at high frequencies leading to less violent/less energetic bubble collapse and lower yield of CH 3 • .

Who reads Sonochemical destruction of nonylphenol: Effects of pH and hydroxyl radical scavengers?

Author

Nilsun H. Ince; Isil Gültekin; Gökce Tezcanli-Güyer

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-3894)

Published

2009

Language

EN

Field

Environmental Science (Physical Sciences)