Documents disponibles écrits par cet auteur

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

Prediction of equillibrium sorption isotherm / Siddharth Parimal in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2882–2888 Titre : Prediction of equillibrium sorption isotherm : comparison of linear and nonlinear methods Type de document : texte imprimé Auteurs : Siddharth Parimal, Auteur ; Murari Prasad, Auteur ; Ujjwal Bhaskar, Auteur Année de publication : 2010 Article en page(s) : pp. 2882–2888 Note générale : Industrial hemistry Langues : Anglais (eng) Mots-clés : Prediction--Equillibrium--Sorption  Isotherm--Linear--Nonlinea Résumé : Sorption of three divalent toxic metal ions, viz. copper, lead, and zinc, onto a low-cost aluminosilicate mineral, pyrophyllite, was studied in a single component system at four different temperatures. Four isotherms—Freundlich, Langmuir, Redlich−Peterson, and Temkin—were examined in order to test their suitability for the given sets of experimental data. A comparison of the linear least-squares method and a trial-and-error nonlinear method of the four isotherms was done. The Langmuir isotherm had four different linear forms, and all of them were individually studied and compared with the others. The parameters of all the four forms of the Langmuir isotherm obtained by the linear method were different. Langmuir-I is the most popular form of the Langmuir isotherm having the highest coefficient of determination values (0.996886) compared with other linear forms of the Langmuir isotherm. The Redlich−Peterson isotherm produced a higher coefficient of determination values (0.999234) in comparison to all the isotherms studied. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9013343 [article] Prediction of equillibrium sorption isotherm : comparison of linear and nonlinear methods [texte imprimé] / Siddharth Parimal, Auteur ; Murari Prasad, Auteur ; Ujjwal Bhaskar, Auteur . - 2010 . - pp. 2882–2888. Industrial hemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2882–2888 Mots-clés : Prediction--Equillibrium--Sorption  Isotherm--Linear--Nonlinea Résumé : Sorption of three divalent toxic metal ions, viz. copper, lead, and zinc, onto a low-cost aluminosilicate mineral, pyrophyllite, was studied in a single component system at four different temperatures. Four isotherms—Freundlich, Langmuir, Redlich−Peterson, and Temkin—were examined in order to test their suitability for the given sets of experimental data. A comparison of the linear least-squares method and a trial-and-error nonlinear method of the four isotherms was done. The Langmuir isotherm had four different linear forms, and all of them were individually studied and compared with the others. The parameters of all the four forms of the Langmuir isotherm obtained by the linear method were different. Langmuir-I is the most popular form of the Langmuir isotherm having the highest coefficient of determination values (0.996886) compared with other linear forms of the Langmuir isotherm. The Redlich−Peterson isotherm produced a higher coefficient of determination values (0.999234) in comparison to all the isotherms studied. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9013343