Journal
CHEMOSPHERE
Volume 93, Issue 1, Pages 160-165Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2013.05.018
Keywords
Photoelectrocatalysis; TiO2 nanotube arrays; Triclosan; 2,7-Dichlorodibenzodioxin; Toxicity
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Funding
- Natural Science Foundation of China [61173071]
- Natural Science Foundation of Henan Province [112300413218]
- Scientific Research Starting Foundation, Henan Normal University [1012]
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Triclosan, one of the most widely used disinfectants, has been found to be toxic to animals and human beings. In this paper, triclosan was degraded on TiO2 nanotube arrays, using a photoelectrocatalytic (PEC) process under UV illumination, with Na2SO4 as the supporting electrolyte. The effect of bias potential was investigated and the results showed that 0 V was the most appropriate potential for the degradation of triclosan. In 30 min, 78.7% of triclosan had degraded during the PEC process. Intermediate analysis showed that 2,7-dichlorodibenzodioxin (DCDD) had formed during the degradation. The toxicity change during the PEC process was investigated using a luminescent bacteria test, with the results demonstrating that the toxicity of the reaction liquid decreased at the beginning and subsequently increased to a stable level. The indications were that some intermediates such as 2,7-dichlorodibenzodioxin was more toxic and stable than triclosan in the solution. (C) 2013 Elsevier Ltd. All rights reserved.
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