Kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence
The simultaneous adsorption of both imazalil (IMZ) and thiabendazole (TBZ) fungicides in a Cu2+-exchanged Mt was studied in this work. Kinetic studies were used to determine the rate law which describes the adsorption of individual fungicides onto the adsorbent. Adsorption isotherm of individual and...
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| Autores principales: | , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2018
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/114766 |
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I19-R120-10915-114766 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Química Cu2+-exchanged montmorillonite Thiabendazole Imazalil Adsorption Crystal structure determination Copper-imazalil complex |
| spellingShingle |
Química Cu2+-exchanged montmorillonite Thiabendazole Imazalil Adsorption Crystal structure determination Copper-imazalil complex Gamba, Martina Lázaro Martínez, Juan M. Olivelli, Melisa L. Yarza, Florencia Vega, Daniel Curutchet, Gustavo Torres Sánchez, Rosa María Kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence |
| topic_facet |
Química Cu2+-exchanged montmorillonite Thiabendazole Imazalil Adsorption Crystal structure determination Copper-imazalil complex |
| description |
The simultaneous adsorption of both imazalil (IMZ) and thiabendazole (TBZ) fungicides in a Cu2+-exchanged Mt was studied in this work. Kinetic studies were used to determine the rate law which describes the adsorption of individual fungicides onto the adsorbent. Adsorption isotherm of individual and combined fungicides was done to evaluate synergic or antagonistic effects. The Mt-Cu material considerably improved TBZ and/or IMZ adsorption from aqueous suspensions with respect to raw Mt, leading to removal efficiencies higher than 99% after 10 min of contact time for TBZ and IMZ Ci = 15 and 40 mg/L, respectively, when a solid dosage = 1 g/L was used. The adsorption sites involved were determined by a combination of X-ray diffraction (XRD) determinations and electron paramagnetic resonance (EPR), indicating that fungicides were bonded to Cu2+ cations, while the rate limiting step was the formation of coordination bonds. The adsorption mechanism proposed is that of ligand exchange between water and fungicide molecules in the metal coordination sphere. The single-crystal structure for the IMZ-Cu2+ complex indicated that four molecules were bounded to the copper centers, while two molecules of TBZ are bounded to copper explaining the higher IMZ uptake capacity for the Mt-Cu material. |
| format |
Articulo Articulo |
| author |
Gamba, Martina Lázaro Martínez, Juan M. Olivelli, Melisa L. Yarza, Florencia Vega, Daniel Curutchet, Gustavo Torres Sánchez, Rosa María |
| author_facet |
Gamba, Martina Lázaro Martínez, Juan M. Olivelli, Melisa L. Yarza, Florencia Vega, Daniel Curutchet, Gustavo Torres Sánchez, Rosa María |
| author_sort |
Gamba, Martina |
| title |
Kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence |
| title_short |
Kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence |
| title_full |
Kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence |
| title_fullStr |
Kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence |
| title_full_unstemmed |
Kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence |
| title_sort |
kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence |
| publishDate |
2018 |
| url |
http://sedici.unlp.edu.ar/handle/10915/114766 |
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Repositorios |
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