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Study of glutamate-modified cellulose beads for Cr(III) adsorption by response surface methodology / Jing Liu in Industrial & engineering chemistry research, Vol. 50 N° 18 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp 10784–10791 Titre : Study of glutamate-modified cellulose beads for Cr(III) adsorption by response surface methodology Type de document : texte imprimé Auteurs : Jing Liu, Auteur ; Min Yan, Auteur ; Yong-Kui Zhang, Auteur Année de publication : 2011 Article en page(s) : pp 10784–10791 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Cellulose  ionic  liquid  Adsorption Résumé : A cellulose-based adsorbent was prepared from a cellulose–ionic liquid solution by emulsification followed by modification with glutamic acid for Cr(III) adsorption from aqueous solution. Response surface methodology (RSM) coupled with central composite design (CCD) was employed to optimize the adsorption process to ensure high adsorption efficiency. Three independent variables [initial Cr(III) concentration, pH, and adsorbent dose] were coded as x1, x2, and x3 at five levels (−1.68179, −1, 0, 1, −1.68179), and a second-order polynomial regression equation was then derived to predict the responses. The standardized effects of the independent variables and their interactions were tested by preparing a Pareto chart. Analysis of variance (ANOVA) showed that a high coefficient of determination value (R2 = 0.9959) and a satisfactory predicted second-order regression model were achieved in the study. Therefore, the optimum conditions for Cr(III) adsorption were established, and the optimum values of the selected variables were obtained by solving the quadratic regression and by analyzing the response surface contour plots. Under the optimum conditions, four sets of experimental trials for Cr(III) adsorption rate were performed, with results that were very close to the predicted values. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200857n [article] Study of glutamate-modified cellulose beads for Cr(III) adsorption by response surface methodology [texte imprimé] / Jing Liu, Auteur ; Min Yan, Auteur ; Yong-Kui Zhang, Auteur . - 2011 . - pp 10784–10791. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp 10784–10791 Mots-clés : Cellulose  ionic  liquid  Adsorption Résumé : A cellulose-based adsorbent was prepared from a cellulose–ionic liquid solution by emulsification followed by modification with glutamic acid for Cr(III) adsorption from aqueous solution. Response surface methodology (RSM) coupled with central composite design (CCD) was employed to optimize the adsorption process to ensure high adsorption efficiency. Three independent variables [initial Cr(III) concentration, pH, and adsorbent dose] were coded as x1, x2, and x3 at five levels (−1.68179, −1, 0, 1, −1.68179), and a second-order polynomial regression equation was then derived to predict the responses. The standardized effects of the independent variables and their interactions were tested by preparing a Pareto chart. Analysis of variance (ANOVA) showed that a high coefficient of determination value (R2 = 0.9959) and a satisfactory predicted second-order regression model were achieved in the study. Therefore, the optimum conditions for Cr(III) adsorption were established, and the optimum values of the selected variables were obtained by solving the quadratic regression and by analyzing the response surface contour plots. Under the optimum conditions, four sets of experimental trials for Cr(III) adsorption rate were performed, with results that were very close to the predicted values. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200857n