Dissolution of nickel oxide in oxalic acid aqueous solutions
The dissolution of nickel oxide (bunsenite) in acid solutions containing oxalic acid has been studied at 70.0°C. The dependencies of the rate of dissolution on total oxalate concentration and on pH have been explained by assuming a mechanism involving the transfer of two different surface complexes,...
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todo:paper_00219797_v244_n2_p353_Figueroa2023-10-03T14:25:11Z Dissolution of nickel oxide in oxalic acid aqueous solutions Figueroa, C.A. Sileo, E.E. Morando, P.J. Blesa, M.A. Dissolution Nickel oxide Oxalic acid Surface complexation Carboxylic acids Complexation Dissolution Fourier transform infrared spectroscopy pH effects Solutions Stability constants Nickel compounds nickel oxalic acid aqueous solution article complex formation concentration (parameters) dissolution Fourier analysis infrared spectroscopy molecular stability pH priority journal synthesis temperature dependence transport kinetics The dissolution of nickel oxide (bunsenite) in acid solutions containing oxalic acid has been studied at 70.0°C. The dependencies of the rate of dissolution on total oxalate concentration and on pH have been explained by assuming a mechanism involving the transfer of two different surface complexes, I and II, that predominate in different pH ranges. The rate law is R = k1 {I} + k2 {II}, where {} denotes surface concentration. The values k1Ns = 3.04 × 10-3 mol Ni m-2 s-1, k2Ns = 1.84 × 10-3 mol Ni m-2 s-1, together with the stability constants K1 = 675 mol-1 dm3 and K2 = 60 mol-1 dm3 fit all the results very well. The species formed in more acidic media is both more stable and more reactive. The possible structures of I and II are discussed on the basis of Fourier transform IR spectroscopy evidence in the literature. © 2001 Elsevier Science. Fil:Sileo, E.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00219797_v244_n2_p353_Figueroa |
| institution |
Universidad de Buenos Aires |
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I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Dissolution Nickel oxide Oxalic acid Surface complexation Carboxylic acids Complexation Dissolution Fourier transform infrared spectroscopy pH effects Solutions Stability constants Nickel compounds nickel oxalic acid aqueous solution article complex formation concentration (parameters) dissolution Fourier analysis infrared spectroscopy molecular stability pH priority journal synthesis temperature dependence transport kinetics |
| spellingShingle |
Dissolution Nickel oxide Oxalic acid Surface complexation Carboxylic acids Complexation Dissolution Fourier transform infrared spectroscopy pH effects Solutions Stability constants Nickel compounds nickel oxalic acid aqueous solution article complex formation concentration (parameters) dissolution Fourier analysis infrared spectroscopy molecular stability pH priority journal synthesis temperature dependence transport kinetics Figueroa, C.A. Sileo, E.E. Morando, P.J. Blesa, M.A. Dissolution of nickel oxide in oxalic acid aqueous solutions |
| topic_facet |
Dissolution Nickel oxide Oxalic acid Surface complexation Carboxylic acids Complexation Dissolution Fourier transform infrared spectroscopy pH effects Solutions Stability constants Nickel compounds nickel oxalic acid aqueous solution article complex formation concentration (parameters) dissolution Fourier analysis infrared spectroscopy molecular stability pH priority journal synthesis temperature dependence transport kinetics |
| description |
The dissolution of nickel oxide (bunsenite) in acid solutions containing oxalic acid has been studied at 70.0°C. The dependencies of the rate of dissolution on total oxalate concentration and on pH have been explained by assuming a mechanism involving the transfer of two different surface complexes, I and II, that predominate in different pH ranges. The rate law is R = k1 {I} + k2 {II}, where {} denotes surface concentration. The values k1Ns = 3.04 × 10-3 mol Ni m-2 s-1, k2Ns = 1.84 × 10-3 mol Ni m-2 s-1, together with the stability constants K1 = 675 mol-1 dm3 and K2 = 60 mol-1 dm3 fit all the results very well. The species formed in more acidic media is both more stable and more reactive. The possible structures of I and II are discussed on the basis of Fourier transform IR spectroscopy evidence in the literature. © 2001 Elsevier Science. |
| format |
JOUR |
| author |
Figueroa, C.A. Sileo, E.E. Morando, P.J. Blesa, M.A. |
| author_facet |
Figueroa, C.A. Sileo, E.E. Morando, P.J. Blesa, M.A. |
| author_sort |
Figueroa, C.A. |
| title |
Dissolution of nickel oxide in oxalic acid aqueous solutions |
| title_short |
Dissolution of nickel oxide in oxalic acid aqueous solutions |
| title_full |
Dissolution of nickel oxide in oxalic acid aqueous solutions |
| title_fullStr |
Dissolution of nickel oxide in oxalic acid aqueous solutions |
| title_full_unstemmed |
Dissolution of nickel oxide in oxalic acid aqueous solutions |
| title_sort |
dissolution of nickel oxide in oxalic acid aqueous solutions |
| url |
http://hdl.handle.net/20.500.12110/paper_00219797_v244_n2_p353_Figueroa |
| work_keys_str_mv |
AT figueroaca dissolutionofnickeloxideinoxalicacidaqueoussolutions AT sileoee dissolutionofnickeloxideinoxalicacidaqueoussolutions AT morandopj dissolutionofnickeloxideinoxalicacidaqueoussolutions AT blesama dissolutionofnickeloxideinoxalicacidaqueoussolutions |
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1807323815272775680 |