Ecotoxicological characterization of photoelectrocatalytic process for degradation of pentachlorophenol on titania nanotubes electrode.

Abstract

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 TiO(2) nanotubes electrode. Acute toxicity of the reaction solution reduced by 83% after 120 min of irradiation. Bioassay-derived 2,3,7,8-TCDD equivalents (TEQ(bio)) increased from 0.72 to 6.72 ng l(-1) during the former reaction stage, decreasing rapidly to 1.25 ng l(-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.

• Authors: Wei Liu, Xie Quan, Qing Cui, Mei Ma, Shuo Chen, Zi-Jian Wang
• Journal: Ecotoxicology and environmental safety (Ecotoxicol Environ Saf) Vol. 71 Issue 1 Pg. 267-73 (Sep 2008) ISSN: 1090-2414 [Electronic] Netherlands
• PMID: 17884164 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Environmental Pollutants
• Titanium
• Pentachlorophenol
• Cytochrome P-450 CYP1A1

Topics

• Animals
• Biological Assay
• Catalysis
• Cell Line, Tumor
• Cytochrome P-450 CYP1A1 (metabolism)
• Electrochemistry
• Electrodes
• Environmental Pollutants (chemistry)
• Enzyme Induction (drug effects)
• Nanotubes (chemistry)
• Pentachlorophenol (chemistry)
• Rats
• Titanium (chemistry)