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论文类型：期刊论文

发表时间：2008-09-01

发表刊物：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY

收录刊物：SCIE、PubMed、Scopus

卷号：71

期号：1

页面范围：267-273

ISSN号：0147-6513

关键字：photoelectrocatalysis; pentachlorophenol; luminescent bacteria; EROD induction; dioxin; environmental safety

摘要：Luminescence bioassay using Vibrio fischeri and in vitro ethoxyresorufin-O-deethylase (EROD) induction bioassay using H4-IIE rat hepatoma cell were employed to test toxicity changes during the photoelectrocatalysis process for the degradation of pentachlorophenol (PCP) on TiO2 nanotubes electrode. Acute toxicity of the reaction solution reduced by 83% after 120min of irradiation. Bioassay-derived 2,3,7,8-TCDD equivalents (TEQ(bio)) increased from 0.72 to 6.72 ng 1(-1) during the former reaction stage, decreasing rapidly to 1.25 ng 1(-1) during the latter reaction stage. HRGC/HRMS analysis detected polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/Fs) congeners in the reaction mixtures. TEQ(bio) and chemical-derived 2,3,7,8-TCDD equivalents (TEQ(cal)) were about of the same order of magnitude. Both results illustrated the formation of dioxins and their removal by photoelectrocatalysis. Moreover, photoelectrocatalysis showed a significant priority over direct photolysis and photocatalysis depending on the reaction conditions, not only for PCP removal but also for reduction in toxicity. (C) 2007 Elsevier Inc. All rights reserved.