Aplicación de modelos difusionales y modelos cinéticos en la interpretación de las cinéticas de adsorción de piridina sobre carbón activado granular
[EN] In this work, a surface diffusion model (SDM) obtained in a previous work was validated in a wide range of experimental conditions to predict the adsorption kinetics of pyridine on activated carbon. Moreover, the predictions of SDM model were compared with those obtained by using the first and second-order kinetic models. The results showed that the secondorder model adjusted satisfactorily the experimental data and fitted the experimental data much better than the first-order kinetic model. The effect of the stirring speed, mass of pyridine adsorbed, (qe), and temperature on the rate constant of the secondorder model, (k2), was analyzed and equations were proposed to correlate k2 as functions of qe and temperature. Nevertheless, the dependence of k2 regarding the temperature, stirring speed and qe cannot be accurately correlated. On the other hand, the SDM model provided a much better prediction than the second order kinetic model. The surface diffusion can be readily estimated from a correlation recommended in this work, whereas the k2 could not be predicted for some of the experimental conditions studied in this work.
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Grupo Español del Carbón
2013-12
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dig-incar-es-10261-1027022016-09-12T10:25:00Z Aplicación de modelos difusionales y modelos cinéticos en la interpretación de las cinéticas de adsorción de piridina sobre carbón activado granular Aplication of diffusional and kinetic models. Modeling the adsorption kinetics of pyridine onto granular activated carbon Ocampo-Pérez, Raúl Leyva-Ramos, Roberto Flores-Cano, J.V. Padilla-Ortega, E. [EN] In this work, a surface diffusion model (SDM) obtained in a previous work was validated in a wide range of experimental conditions to predict the adsorption kinetics of pyridine on activated carbon. Moreover, the predictions of SDM model were compared with those obtained by using the first and second-order kinetic models. The results showed that the secondorder model adjusted satisfactorily the experimental data and fitted the experimental data much better than the first-order kinetic model. The effect of the stirring speed, mass of pyridine adsorbed, (qe), and temperature on the rate constant of the secondorder model, (k2), was analyzed and equations were proposed to correlate k2 as functions of qe and temperature. Nevertheless, the dependence of k2 regarding the temperature, stirring speed and qe cannot be accurately correlated. On the other hand, the SDM model provided a much better prediction than the second order kinetic model. The surface diffusion can be readily estimated from a correlation recommended in this work, whereas the k2 could not be predicted for some of the experimental conditions studied in this work. [ES] En este trabajo el modelo de difusión superficial (MDS) obtenido en un trabajo previo se validó en un amplio intervalo de condiciones experimentales para predecir la cinética de adsorción de piridina en carbón activado. Más aun, la predicción del modelo MDS se comparó con las predicciones obtenidas utilizando el modelo cinético de primer y segundo orden. Los resultados demostraron que el modelo cinético de segundo orden ajustó de mejor manera los datos experimentales que el modelo cinético de primer orden. La constante cinética de segundo orden, k2, se correlacionó con distintas variables de operación (masa adsorbida en el equilibrio, temperatura, velocidad de agitación) obteniéndose ecuaciones para predecir k2. Sin embargo, estas dependencias presentaron bastante incertidumbre y en algunos casos carencia de significado físico. Por otra parte, el modelo MDS proporcionó una mejor predicción que el modelo cinético de segundo orden. Más aun, el coeficiente de difusión superficial, Ds, puede estimarse correctamente en un amplio intervalo de condiciones experimentales mediante una correlación propuesta en este trabajo. Peer reviewed 2014-09-30T10:49:38Z 2014-09-30T10:49:38Z 2013-12 artículo http://purl.org/coar/resource_type/c_6501 Boletín del Grupo Español del Carbón (30): 6-9 (2013) 2172-6094 http://hdl.handle.net/10261/102702 es Publisher's version www.gecarbon.org/Boletines/Boletin/BoletinGEC_030.pdf Sí open Grupo Español del Carbón |
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[EN] In this work, a surface diffusion model (SDM) obtained
in a previous work was validated in a wide range of
experimental conditions to predict the adsorption
kinetics of pyridine on activated carbon. Moreover,
the predictions of SDM model were compared with
those obtained by using the first and second-order
kinetic models. The results showed that the secondorder
model adjusted satisfactorily the experimental
data and fitted the experimental data much better
than the first-order kinetic model. The effect of the
stirring speed, mass of pyridine adsorbed, (qe), and
temperature on the rate constant of the secondorder
model, (k2), was analyzed and equations
were proposed to correlate k2 as functions of qe
and temperature. Nevertheless, the dependence of
k2 regarding the temperature, stirring speed and qe
cannot be accurately correlated. On the other hand,
the SDM model provided a much better prediction
than the second order kinetic model. The surface
diffusion can be readily estimated from a correlation
recommended in this work, whereas the k2 could not
be predicted for some of the experimental conditions
studied in this work. |
| format |
artículo |
| author |
Ocampo-Pérez, Raúl Leyva-Ramos, Roberto Flores-Cano, J.V. Padilla-Ortega, E. |
| spellingShingle |
Ocampo-Pérez, Raúl Leyva-Ramos, Roberto Flores-Cano, J.V. Padilla-Ortega, E. Aplicación de modelos difusionales y modelos cinéticos en la interpretación de las cinéticas de adsorción de piridina sobre carbón activado granular |
| author_facet |
Ocampo-Pérez, Raúl Leyva-Ramos, Roberto Flores-Cano, J.V. Padilla-Ortega, E. |
| author_sort |
Ocampo-Pérez, Raúl |
| title |
Aplicación de modelos difusionales y modelos cinéticos en la interpretación de las cinéticas de adsorción de piridina sobre carbón activado granular |
| title_short |
Aplicación de modelos difusionales y modelos cinéticos en la interpretación de las cinéticas de adsorción de piridina sobre carbón activado granular |
| title_full |
Aplicación de modelos difusionales y modelos cinéticos en la interpretación de las cinéticas de adsorción de piridina sobre carbón activado granular |
| title_fullStr |
Aplicación de modelos difusionales y modelos cinéticos en la interpretación de las cinéticas de adsorción de piridina sobre carbón activado granular |
| title_full_unstemmed |
Aplicación de modelos difusionales y modelos cinéticos en la interpretación de las cinéticas de adsorción de piridina sobre carbón activado granular |
| title_sort |
aplicación de modelos difusionales y modelos cinéticos en la interpretación de las cinéticas de adsorción de piridina sobre carbón activado granular |
| publisher |
Grupo Español del Carbón |
| publishDate |
2013-12 |
| url |
http://hdl.handle.net/10261/102702 |
| work_keys_str_mv |
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