Degradation of pentachlorophenol as a model hazardous and recalcitrant organochlorinated pollutant using AgIII
Ileana R. Zamora-Garcia A , Alejandro Alatorre-Ordaz A , Jorge G. Ibanez B C , Julio Cesar Torres-Elguera A , Kazimierz Wrobel A and Silvia Gutierrez-Granados A
+ Author Affiliations
- Author Affiliations
A Departamento de Quimica Analitica, Unidad Pueblito de Rocha, Campus Guanajuato, Universidad de Guanajuato, Cerro de la Venada s/n, Col. Pueblito de Rocha, CP 36040 Guanajuato, Mexico.
B Depto. de Ing. y Ciencias Quimicas, Centro Mexicano de Quimica Verde y Microescala, Universidad Iberoamericana, Prol. Reforma 880, 01219 Ciudad de Mexico, Mexico.
C Corresponding author. Email: jorge.ibanez@ibero.mx
Environmental Chemistry 14(8) 476-485 https://doi.org/10.1071/EN17114
Submitted: 24 February 2017 Accepted: 26 October 2017 Published: 21 March 2018
Environmental context. Electrochemistry offers potential applications for environmental remediation. Pentachlorophenol, a highly toxic and recalcitrant halogenated compound, is degraded by a novel oxidant produced electrochemically, and the intermediates and products of the degradation are investigated. Cyclic remediation systems merit further study.
Abstract. The use of electrochemically generated Ag(OH)4− as a strong oxidising agent was evaluated for the treatment of a model hazardous and recalcitrant organochlorinated pollutant, pentachlorophenol (PCP). High-performance liquid chromatography (HPLC), gas chromatography with flame ionisation detection (GC-FID) or with electron capture detection (GC-ECD), gas chromatography with mass spectrometry detection and UV-visible spectroscopy were utilised to investigate intermediates and products generated during such treatment. From these, it was deduced that dechlorination occurred first, followed by an oxidative ring opening at the C=C bond that destabilised the remaining structure and generated tetrachloro-p-benzoquinone, 2,3,5,6-tetrachlorophenol, 2,3,4,6-tetrachlorophenol, 2,4,6-trichlorophenol (or 2,3,5-trichlorophenol), 2,4,5-trichlorophenol (or 2,3,6-trichlorophenol) and 2,4-dichlorophenol (or 3,4-dichlorophenol). In contrast to other remediation methods (e.g. incineration) no highly toxic molecules such as dioxins were generated by this novel degradation system.
Additional keywords: analytical chemistry, persistent organic pollutants (POPs).
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