Kinetics of cobalt and copper oxides dissolution in Acidic media containing edta
Елисеева Е. А., Плахотная О. Н., Горичев И. Г., Атанасян Т. К., Слyнко Л. Е.
Вестник Московского государственного технического университета им. Н.Э. Баумана. Серия: Естественные науки
Т. 2018, Вып. 1, С. 115-124
Опубликовано: 2018
Тип ресурса: Статья
DOI:10.18698/1812-3368-2018-1-115-124
Аннотация:
We studied the dependence of the rate of dissolution of d-elements oxides (cobalt and copper oxides) in acidic media with EDTA additives from different factors. Increase in EDTA concentration enhances the cobalt and copper oxides dissolution, while the copper oxide dissolution is inhibited. Within the research we determined the orders by hydrogen ions and EDTA: For cobalt oxide it is 0.5 ± 0.1; for copper oxide it is nH=0,6, and by EDTA it is∼-0.6. The peculiarity of the studied kinetics in EDTA is that the rate of cobalt oxides dissolution passes through a maximum at pH =-1, for copper oxide in the presence of chelating agent EDTA the dissolution rate first decreases, and then it increases at pH from 5 to 8. The activation energy of the process is Ea (H2SO4) = = 70 kJ/mol, Ea (EDTA) = 60 kJ/mol, for copper oxide the activation energy is 73 ± 0.5 kJ/mol. The simulation of the processes showed that the surface particle, which determines the rate of dissolution is eOH+ in mineral acids,
Ключевые слова:
Barton-Stranskiy Model; Cobalt Oxides; Copper Oxides; Dissolution; EDTA; Hougen-Watson; Kinetics; Simulation
Язык текста: Русский
ISSN: 1812-3368
Елисеева Е. А.
Плахотная О. Н. Ольга Николаевна 1977-
Горичев И. Г.
Атанасян Т. К.
Слyнко Л. Е.
Eliseeva E. A.
Plakhotnaya O. N. Ol`ga Nikolaevna 1977-
Gorichev I. G.
Atanasyan T. K.
Slynko L. E.
Kinetics of cobalt and copper oxides dissolution in Acidic media containing edta
Текст визуальный непосредственный
Вестник Московского государственного технического университета им. Н.Э. Баумана. Серия: Естественные науки
Московский государственный технический университет имени Н.Э. Баумана (национальный исследовательский университет)
Т. 2018, Вып. 1 С. 115-124
2018
Статья
Barton-Stranskiy Model Cobalt Oxides Copper Oxides Dissolution EDTA Hougen-Watson Kinetics Simulation
We studied the dependence of the rate of dissolution of d-elements oxides (cobalt and copper oxides) in acidic media with EDTA additives from different factors. Increase in EDTA concentration enhances the cobalt and copper oxides dissolution, while the copper oxide dissolution is inhibited. Within the research we determined the orders by hydrogen ions and EDTA: For cobalt oxide it is 0.5 ± 0.1; for copper oxide it is nH=0,6, and by EDTA it is∼-0.6. The peculiarity of the studied kinetics in EDTA is that the rate of cobalt oxides dissolution passes through a maximum at pH =-1, for copper oxide in the presence of chelating agent EDTA the dissolution rate first decreases, and then it increases at pH from 5 to 8. The activation energy of the process is Ea (H2SO4) = = 70 kJ/mol, Ea (EDTA) = 60 kJ/mol, for copper oxide the activation energy is 73 ± 0.5 kJ/mol. The simulation of the processes showed that the surface particle, which determines the rate of dissolution is eOH+ in mineral acids,