Electrochemical reduction of organohalogen compound by noble metal sintered electrode

Electrochemical Reduction of Hexachlorobenzene in Organic and Aquo-Organic Media with Co(II)Salen as Catalyst

“…Voltammograms b and c were performed on HCB at different concentrations (25 and 50 ppm, respectively); two irreversible reduction peaks are observed. In order to assign these peaks we performed separate voltammograms on pentachlorobenzene and tetrachlorobenzene solutions (not shown here) and found similar results to those reported earlier [11,12,15,16], which allowed the following assignments. The first peak (at ca.…”

“…Tetrachlorobenzene, chlorobenzene and lindane can be dehalogenated on graphite -Pd and graphite -Zn cathodes [12]. Trichlorobenzene is reduced to di-and mono-chlorobenzene on different cathodes (e.g., RuO 2 , Pt, Pd) in ACN and in NaOH [15]. In order to understand the effect of water on the reduction mechanism, binary solvents (typically aquo-organic) are used.…”

Study on the Effect of Electrochemical Dechlorination Reduction of Hexachlorobenzene Using Different Cathodes

“…The electrochemical method is now emerging as a mild and environment-friendly process for destruction of POPs, in which the hazardous material can be transformed into harmless products in a closed system, with no toxic emissions [10]. The electrochemical destruction of chlorinated organic compounds has been extensively studied in aqueous solutions with various electrode materials, mainly metals, graphite, and composites [11–15].…”

“…Kumiko Miyoshi et al [10] tried to use the electrode with titanium-based coatings as the cathode to perform the dechlorination treatment on 1,2,3-TCB. The results revealed that the dechlorination rate of electrode with RuO 2 /Pt/PdO coatings was 91%, while that of RuO 2 was 59%.…”

Chemical Degradation of Chlorinated Organic Pollutants for In Situ Remediation and Evaluation of Natural Attenuation

“…The major remediation method for more the accumulation of chlorobenzenes with a higher chlorination level in soils is incineration at high temperatures for digging out of soils. In the previous reports of electrochemical dehalogenation of chlorinated benzenes (Miyoshi et al, 2004;Mohammad and Dennis, 1997;Farwell et al, 1975;Kargina et al, 1997;Guena et al, 2000), the chlorine is eliminated step by step from the highly chlorinated benzenes to yield less-chlorinated benzenes and finally transform to benzene. Farwell et al (1975) reported on chlorobenzenes and the main cathodic reaction pathway for hexachlorobenzenes as follows: hexachlorobenzene → pentachlorobenzene → 1,2,3,5-tetrachlorobenzene → 1,2,4-trichlorobenzene → 1,4-dichlorobenzene → monochlorobenzene → benzene.…”