Electrooxidation of 4-clorphenol on modified lead dioxide anodes

Shmychkova, O. and Luk’yanenko, T. and Dmitrikova, L. and Velichenko, A. (2018) Electrooxidation of 4-clorphenol on modified lead dioxide anodes. Voprosy khimii i khimicheskoi tekhnologii = Вопросы химии и химической технологии, No. 3. pp. 50-57. ISSN 2413-7987 (Online), ISSN 0321-4095 (Print)

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Abstract

The electrochemical oxidation of 4-chlorophenol on lead dioxide anodes micromodified by ions of iron group has been investigated. As follows from the data obtained, the rate of oxidation of organic substances on the anode materials involved is proportional to the number of reactive oxygen species in the near-electrode zone (OH–radicals) formed during the electrolysis as intermediates in water oxidation and participating in subsequent homogeneous chemical reactions with organic substrates in the bulk. The O1s peak on X– Ray photoelectron spectra was used to evaluate the amount of inert and labile oxygencontaining particles on undoped and doped PbO2 . Doping of lead dioxide with nickel leads to a significant increase in the number of labile oxygen-containing particles on the surface of the electrode, while iron modification leads to the opposite effect – an increase in the amount of inert oxygen-containing particles. The anodic oxidation of 4-chlorophenol yields a rather large number of intermediate products. The main intermediates include benzoquinone and maleic acid which was confirmed by high-performance liquid chromatography. The micromodification of lead dioxide with metal ions of iron group leads to a significant change in the electrocatalytic activity of oxide materials. The activity grows in the following sequence of modifying ions: PbO2<Co–PbO2<Fe–PbO2<Ni–PbO2 .

Item Type: Article
Uncontrolled Keywords: lead dioxide, nitrate electrolyte, 4-chlorophenol, oxygen-containing radicals, O1S peak.
Subjects: Organic Chemistry
Divisions: Departments > Department of Biochemistry, Medical and Pharmaceutical Chemistry
Depositing User: Елена Шрамко
Date Deposited: 29 Oct 2019 13:30
Last Modified: 29 Oct 2019 13:30
URI: http://repo.dma.dp.ua/id/eprint/4429

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