Modified lead dioxide for organic wastewater treatment: Physicochemical properties and electrocatalytic activity

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Olesia Shmychkova
Tatiana Luk'yanenko
Larisa Dmitrikova
Alexander Velichenko

Abstract

An investigation on lead dioxide electrodeposition from methane­sul­fonate electrolytes additionally containing Ni2+ is reported. It is shown that the lead dioxide electrodes micromodified by nickel have different physico­chem­ical properties vs. nonmodified PbO2-anodes, that are formed during the depo­sition. The electrocatalytical reactivity of the electrodes involved in com­par­ison to both the oxygen evolution, as well as to the electrooxidation of 2,4-
-dichlorophenoxyacetic (2,4-D) acid is investigated. The processes of electro­chemical oxidation of 2,4-D on various materials occur qualitatively with the same mechanism and differ only in the reaction rate. It is shown that the Ni-PbO2-anode possesses the highest electrocatalytic activity: the destruction rate of 2,4-D on it increases 1.5 times in comparison with the unmodified lead diox­ide. The chemical oxygen demand (COD) of a 0.4 mM solution of 2,4-D, det­ermined by the dichromate method, is 90.0 mg dm-3 which is 94 % of the theor­etical value.

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How to Cite
[1]
O. Shmychkova, T. Luk’yanenko, L. Dmitrikova, and A. Velichenko, “Modified lead dioxide for organic wastewater treatment: Physicochemical properties and electrocatalytic activity”, J. Serb. Chem. Soc., vol. 84, no. 2, pp. 187–198, Mar. 2019.
Section
Electrochemistry

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