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Ultrasound enhanced catalytic ozonation of tetracycline in a rectangular air-lift reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
55753 47063 2011 10 PDF Available
Title
Ultrasound enhanced catalytic ozonation of tetracycline in a rectangular air-lift reactor
Abstract

The antibiotics tetracycline (TC) was degraded by ultrasound (US) enhanced catalytic ozonation using goethite catalyst (US/goethite/O3) in a rectangular air-lift reactor. The effect of important operational parameters, including gaseous ozone concentration, gas flow rate, free radical scavenger, pH, and power density, on the removal of TC was investigated. The results showed that the TC removal followed pseudo-first-order kinetics and the removal rate increased with increasing gaseous ozone concentration, pH, gas flow rate and power density. The presence of free radical scavenger inhibited the removal rate to some extent. The catalyst stability was evaluated by measuring TC removal rate and iron leaching for three successive cycles. Almost no changes in the particle size and the surface area of the catalyst were observed before and after the reaction. The main intermediates were identified and the degradation pathway of TC was proposed. Toxicity test with Daphnia magna showed that the acute toxicity increased during the first stage of the reaction, and then gradually decreased with the progress of the oxidation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (128 K)Download as PowerPoint slideHighlights► Ultrasound enhanced catalytic ozonation using goethite readily decomposed tetracycline. ► The tetracycline removal rate followed the pseudo-first-order kinetics. ► The main intermediates were identified by liquid chromatography–mass spectrometry. ► The degradation pathway of tetracycline was proposed.

Keywords
Catalytic ozonation; Ultrasonic irradiation; Goethite; Tetracycline; Rectangular air-lift reactor
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Ultrasound enhanced catalytic ozonation of tetracycline in a rectangular air-lift reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 175, Issue 1, 25 October 2011, Pages 283–292
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us