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Modeling the adsorption kinetics of divalent metal ions onto pyrophyllite using the integral method / Neelmani Gupta in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2125–2128 Titre : Modeling the adsorption kinetics of divalent metal ions onto pyrophyllite using the integral method Type de document : texte imprimé Auteurs : Neelmani Gupta, Auteur ; Murari Prasad, Auteur ; Nidhi Singhal, Auteur Année de publication : 2009 Article en page(s) : p. 2125–2128 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Adsorption  system  Metal  cations  Nonlinear  sorption  kinetic  model Résumé : The adsorption system was modeled and simulated to predict kinetic parameters for the adsorption of metal cations (lead, copper, and zinc) onto pyrophyllite, a low-cost adsorbent. The developed nonlinear sorption kinetic (NSK) mathematical model was solved using numerical integration (trapezoidal method), the gradient descent method, and least-squares analysis. It was based on application of the Freundlich isotherm to mass transfer across the film surrounding the adsorbent. Batch adsorption experiments were carried out for cation concentrations varying from 5.0 to 100.0 mg L−1. Code was developed in C language both for numerically integrating the model equation and for obtaining the best simulated values of the Freundlich constants, K and N; the order of reaction, n; and the film transfer coefficient, α. The model was sensitive to parameters α, n, and N, whereas it is insensitive to K. The values of parameters N, n, and α lie in the ranges of 0.185−2.06, 0.943−1.341, and 0.009−0.113 [(L/mg)n−1 min−1], respectively, under different experimental conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800975m [article] Modeling the adsorption kinetics of divalent metal ions onto pyrophyllite using the integral method [texte imprimé] / Neelmani Gupta, Auteur ; Murari Prasad, Auteur ; Nidhi Singhal, Auteur . - 2009 . - p. 2125–2128. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2125–2128 Mots-clés : Adsorption  system  Metal  cations  Nonlinear  sorption  kinetic  model Résumé : The adsorption system was modeled and simulated to predict kinetic parameters for the adsorption of metal cations (lead, copper, and zinc) onto pyrophyllite, a low-cost adsorbent. The developed nonlinear sorption kinetic (NSK) mathematical model was solved using numerical integration (trapezoidal method), the gradient descent method, and least-squares analysis. It was based on application of the Freundlich isotherm to mass transfer across the film surrounding the adsorbent. Batch adsorption experiments were carried out for cation concentrations varying from 5.0 to 100.0 mg L−1. Code was developed in C language both for numerically integrating the model equation and for obtaining the best simulated values of the Freundlich constants, K and N; the order of reaction, n; and the film transfer coefficient, α. The model was sensitive to parameters α, n, and N, whereas it is insensitive to K. The values of parameters N, n, and α lie in the ranges of 0.185−2.06, 0.943−1.341, and 0.009−0.113 [(L/mg)n−1 min−1], respectively, under different experimental conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800975m