期刊
CHEMOSPHERE
卷 92, 期 8, 页码 925-932出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2013.02.066
关键词
Tetracycline; TiO2; Photocatalysis; Mechanism
资金
- National Natural Science Foundation of China [41001342, 40930739]
Tetracyclines are widely-used antibiotics in the world. Due to their poor absorption by human beings, or poultry and livestocks, most of them are excreted into the environment, causing growing concern about their potential impact, while photodegradation has been found to dominate their sequestration and bio-availability. Coupling with high-performance liquid chromatography-mass spectroscopy (HPLC-MS), gas chromatography-mass spectroscopy (GC-MS) and electron spin resonance (ESR), the mechanism of photocatalytic degradation of TC in aqueous solution by nanosized TiO2 (P25) under UV irradiation was investigated. The photocatalysis eliminated 95% of TC and 60% of total organic carbon (TOC) after 60 min irradiation, and NH4+ ion was found to be one of the end-products. Bioluminescence assay showed that the toxicity of TC solution reached the maximum after 20 min irradiation and then gradually decreased. The degradation of TC included electron transfer, hydroxylation, open-ring reactions and cleavage of the central carbon. A possible photocatalytic degradation pathway of TC was proposed on the basis of the identified intermediates. Overall, the TiO2 photocatalysis was found to be a promising process for removing TC and its intermediates. (C) 2013 Elsevier Ltd. All rights reserved.
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