title: Photoelectrocatalytic degradation of triclosan on TiO2 nanotube arrays and toxicity change.
abstract: 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 0V was the most appropriate potential for the degradation of triclosan. In 30min, 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.
authors.affiliation: School of Environmental Science, Henan Normal University, Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Xinxiang 453007, PR China. lhj671@sohu.com
authors.forename: Haijin
authors.initials: H
authors.lastname: Liu
authors.forename: Xianglin
authors.initials: X
authors.lastname: Cao
authors.forename: Guoguang
authors.initials: G
authors.lastname: Liu
authors.forename: Yingling
authors.initials: Y
authors.lastname: Wang
authors.forename: Nan
authors.initials: N
authors.lastname: Zhang
authors.forename: Tong
authors.initials: T
authors.lastname: Li
authors.forename: Robert
authors.initials: R
authors.lastname: Tough
mesh_terms: D001419:Bacteria / Q000187:drug effects; D002384:Catalysis; D002713:Chlorine / Q000737:chemistry; D004563:Electrochemistry; D004785:Environmental Pollutants / Q000737:chemistry* / Q000633:toxicity*; D006863:Hydrogen-Ion Concentration; D043942:Nanotubes / Q000737:chemistry*; D055668:Photochemical Processes; D014025:Titanium / Q000737:chemistry*; D014260:Triclosan / Q000737:chemistry* / Q000633:toxicity*
chemical_list: D004785:Environmental Pollutants; C009495:titanium dioxide; D014260:Triclosan; D002713:Chlorine; D014025:Titanium
keywords: 2,7-Dichlorodibenzodioxin; Photoelectrocatalysis; TiO(2) nanotube arrays; Toxicity; Triclosan