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Adsorption of pesticides from aqueoussolution onto bananastalkactivated carbon / J.M. Salman in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.41-48 Titre : Adsorption of pesticides from aqueoussolution onto bananastalkactivated carbon Type de document : texte imprimé Auteurs : J.M. Salman, Auteur ; V.O. Njoku, Auteur ; B.H. Hameed, Auteur Année de publication : 2012 Article en page(s) : pp.41-48 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : 2,4-Dichlorophenoxyacetic  acid  Bentazon  Isotherm  Kinetic  Thermodynamic Résumé : Activated carbon was prepared from bananastalk by potassium hydroxide (KOH) and carbon dioxide (CO2) activation and its ability to remove the pesticides, 2,4-dichlorophenoxyacetic acid (2,4-D) and bentazon was explored. The bananastalkactivated carbon (BSAC) was characterized by Fourier transform infrared spectroscopy (FT-IR) analysis. The adsorption kinetic data were analyzed using two kinetic models: the pseudo-first-order and pseudo-second-order models. The adsorption kinetics was better represented by the pseudo-second-order model. The equilibrium adsorption data obtained at 30, 40 and 50 °C were analyzed by Langmuir and Freundlich isotherm models and results showed that it was better described by the Freundlich model. Higher adsorption capacity observed for 2,4-D than bentazon were attributed to the presence of electron-withdrawing –Cl groups on the aromatic ring and smaller molecular size of 2,4-D. The thermodynamic parameters, ΔG°, ΔH° and ΔS° determined, showed that the adsorption of 2,4-D and bentazon onto BSAC was feasible, spontaneous and exothermic. The results showed that BSAC is an efficient adsorbent for the adsorptive removal of 2,4-D and bentazon from aqueoussolutions. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711009715 [article] Adsorption of pesticides from aqueoussolution onto bananastalkactivated carbon [texte imprimé] / J.M. Salman, Auteur ; V.O. Njoku, Auteur ; B.H. Hameed, Auteur . - 2012 . - pp.41-48. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.41-48 Mots-clés : 2,4-Dichlorophenoxyacetic  acid  Bentazon  Isotherm  Kinetic  Thermodynamic Résumé : Activated carbon was prepared from bananastalk by potassium hydroxide (KOH) and carbon dioxide (CO2) activation and its ability to remove the pesticides, 2,4-dichlorophenoxyacetic acid (2,4-D) and bentazon was explored. The bananastalkactivated carbon (BSAC) was characterized by Fourier transform infrared spectroscopy (FT-IR) analysis. The adsorption kinetic data were analyzed using two kinetic models: the pseudo-first-order and pseudo-second-order models. The adsorption kinetics was better represented by the pseudo-second-order model. The equilibrium adsorption data obtained at 30, 40 and 50 °C were analyzed by Langmuir and Freundlich isotherm models and results showed that it was better described by the Freundlich model. Higher adsorption capacity observed for 2,4-D than bentazon were attributed to the presence of electron-withdrawing –Cl groups on the aromatic ring and smaller molecular size of 2,4-D. The thermodynamic parameters, ΔG°, ΔH° and ΔS° determined, showed that the adsorption of 2,4-D and bentazon onto BSAC was feasible, spontaneous and exothermic. The results showed that BSAC is an efficient adsorbent for the adsorptive removal of 2,4-D and bentazon from aqueoussolutions. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711009715

Batch and fixed - bedadsorption of 2 , 4 - dichlorophenoxyaceticacid onto oilpalm frond activated carbon / J.M. Salman in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.33-40 Titre : Batch and fixed - bedadsorption of 2 , 4 - dichlorophenoxyaceticacid onto oilpalm frond activated carbon Type de document : texte imprimé Auteurs : J.M. Salman, Auteur ; V.O. Njoku, Auteur ; B.H. Hameed, Auteur Année de publication : 2012 Article en page(s) : pp.33-40 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : 2,4-D  Breakthrough  characteristics  Column  studies  Kinetics  Pesticide Résumé : Adsorption of 2,4-dichlorophenoxyaceticacid (2,4-D) from aqueous solution onto activated carbon derived from oilpalm frond (PFAC) was investigated using batch and column systems. The effects of contact time, initial concentration of 2,4-D, temperature and pH on the adsorption were studied using the batch technique. The adsorption kinetic data were analyzed using the pseudo-first- and pseudo-second-order models and the results showed that the pseudo-second-order model best described the adsorption kinetics. The adsorption isotherms of 2,4-D on PFAC were analyzed using the Langmuir and Freundlich isotherm models and the results showed that a better fit was achieved with the Langmuir model. The determined thermodynamic parameters, ΔG°, ΔH° and ΔS° showed that the adsorption of 2,4-D onto PFAC was feasible, spontaneous and exothermic under the examined conditions. For the column studies, the effects of initial concentration of 2,4-D, bed-height and flow rate on the adsorption of 2,4-D onto PFAC were investigated. The highest bed capacity of 45 mg/g at 150 mg/L 2,4-D initial concentration, 10 mL/min flow rate and 3 cm PFAC bed-height was obtained. Three models, namely Bohart–Adams, Thomas and Yoon–Nelson, were applied to predict the breakthrough curves and to determine the characteristic parameters. The average relative error method was used to determine the model with the best fit and it was found that the Bohart–Adams model best described the continuous adsorption of 2,4-D onto PFAC. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711009697 [article] Batch and fixed - bedadsorption of 2 , 4 - dichlorophenoxyaceticacid onto oilpalm frond activated carbon [texte imprimé] / J.M. Salman, Auteur ; V.O. Njoku, Auteur ; B.H. Hameed, Auteur . - 2012 . - pp.33-40. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.33-40 Mots-clés : 2,4-D  Breakthrough  characteristics  Column  studies  Kinetics  Pesticide Résumé : Adsorption of 2,4-dichlorophenoxyaceticacid (2,4-D) from aqueous solution onto activated carbon derived from oilpalm frond (PFAC) was investigated using batch and column systems. The effects of contact time, initial concentration of 2,4-D, temperature and pH on the adsorption were studied using the batch technique. The adsorption kinetic data were analyzed using the pseudo-first- and pseudo-second-order models and the results showed that the pseudo-second-order model best described the adsorption kinetics. The adsorption isotherms of 2,4-D on PFAC were analyzed using the Langmuir and Freundlich isotherm models and the results showed that a better fit was achieved with the Langmuir model. The determined thermodynamic parameters, ΔG°, ΔH° and ΔS° showed that the adsorption of 2,4-D onto PFAC was feasible, spontaneous and exothermic under the examined conditions. For the column studies, the effects of initial concentration of 2,4-D, bed-height and flow rate on the adsorption of 2,4-D onto PFAC were investigated. The highest bed capacity of 45 mg/g at 150 mg/L 2,4-D initial concentration, 10 mL/min flow rate and 3 cm PFAC bed-height was obtained. Three models, namely Bohart–Adams, Thomas and Yoon–Nelson, were applied to predict the breakthrough curves and to determine the characteristic parameters. The average relative error method was used to determine the model with the best fit and it was found that the Bohart–Adams model best described the continuous adsorption of 2,4-D onto PFAC. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711009697