Interaction between Copper(II) Oxide and Aqueous Ammonia in the Presence of Ethylenediaminetetraacetic Acid |
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| Authors: | Nevskaya E. Yu. Gorichev I. G. Safronov S. B. Zaitsev B. E. Kutepov A. M. Izotov A. D. |
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| Affiliation: | (1) Russian University of Peoples Friendship, ul. Miklukho-Maklaya 6, Moscow, 117198, Russia;(2) Moscow State Pedagogical University, ul. Kibal'chicha 6, Moscow, 129242, Russia;(3) Moscow State University of Ecological Engineering, Staraya Basmannaya ul. 21/4, Moscow, 107884, Russia;(4) Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia |
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| Abstract: | The interaction of copper(II) oxide with aqueous ammonia containing ethylenediaminetetraacetic acid (H4L) is analyzed in terms of formal heterogeneous kinetics and the fractal dimension of the dissolving space. It is shown experimentally that, in the presence of H4L, the dissolution rate of CuO grows with increasing ammonia concentration. At a fixed ammonia concentration, the dissolution rate of CuO passes through a maximum at an H4L concentration of 8 × 10–3mol/l. Two mechanisms of dissolution are suggested, namely, an adsorption and a redox mechanism. The adsorption mechanism involves four intermediate species and implies that the dissolution rate is a fractional rational function of the EDTA concentration. The redox mechanism takes into account the oxide/electrolyte interfacial potential. The role of the CuOHL3–ion is elucidated, and the kinetic parameters of dissolution are derived. |
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