Interaction between copper(II) oxide and aqueous ammonia in the presence of ethylenediaminetetraacetic acid

The interaction of copper(II) oxide with aqueous ammonia containing ethylenediaminetetraacetic acid (H 4L) 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 H 4L, 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 H 4L 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 CuOHL 3-ion is elucidated, and the kinetic parameters of dissolution are derived.

Авторы
Nevskaya E.Yu. 1 , Gorichev I.G.2 , Safronov S.B. 1 , Zaitsev B.E. 1 , Kutepov A.M.3 , Izotov A.D.4
Редакторы
-
Издательство
-
Номер выпуска
5
Язык
Английский
Страницы
503-509
Статус
Опубликовано
Подразделение
-
Номер
-
Том
35
Год
2001
Организации
  • 1 Russ. Univ. of Peoples Friendship, Ul. Miklukho-Maklaya 6, Moscow, 117198 Russia, Russian Federation
  • 2 Moscow State Pedagogical University, Ul. kibal'Chicha 6, Moscow, 129242 Russia, Russian Federation
  • 3 Moscow State Univ. of Ecol. Eng., Staraya Basmannaya Ul. 21/4, Moscow, 107884 Russia, Russian Federation
  • 4 Kurnakov Inst. Gen. and Inorg. Chem., Russian Academy of Sciences, Leninskii Pr. 31, Moscow, 119991 R., Russian Federation
Ключевые слова
ammonia; copper derivative; edetic acid; electrolyte; oxide; adsorption; aqueous solution; article; chemical interaction; concentration response; dissolution; kinetics; oxidation reduction reaction; reaction analysis
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/319/