Documents disponibles écrits par cet auteur

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

Synthesis of bimodal porous titania beads and their potential in liquid chromatography / Kai-Feng Du in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6101-6108 Titre : Synthesis of bimodal porous titania beads and their potential in liquid chromatography Type de document : texte imprimé Auteurs : Kai-Feng Du, Auteur ; Min Yan, Auteur ; Hang Song, Auteur Année de publication : 2011 Article en page(s) : pp. 6101-6108 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Liquid  chromatography Résumé : Bimodal porous titania beads were synthesized from titania nanocrystals of about 34 nm by a method that combines particles agglomeration and sol-gel templating process. The structure properties of porous titania beads were investigated, and the results indicated that the porous titania beads in size of about 15 μm are pure anatase phase and featured by two types of pores with macropores centered at about 200 nm and mesopores smaller than 10 nm. The bimodal pore structure is attributed to hard aggregates of titania particles with different size. In particular, the larger titania nanocrystals agglomerate into macropores and the smaller ones from crystal growth of coated titania into mesopores. Finally, after cation modification, the bimodal porous adsorbents (BPA) were evaluated for investigating chromatographic performance and compared to microporous ones (MPA). It was observed that static and dynamic adsorption capacities of cytochrome C on BPA are both larger than that on MPA. Moreover, the BPApacked column shows better column efficiency than the MPA packed one in test flow rates. Therefore, we demonstrated that the BPA occupies more advantages over the other one and is expected for potential application in chromatography. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158908 [article] Synthesis of bimodal porous titania beads and their potential in liquid chromatography [texte imprimé] / Kai-Feng Du, Auteur ; Min Yan, Auteur ; Hang Song, Auteur . - 2011 . - pp. 6101-6108. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6101-6108 Mots-clés : Liquid  chromatography Résumé : Bimodal porous titania beads were synthesized from titania nanocrystals of about 34 nm by a method that combines particles agglomeration and sol-gel templating process. The structure properties of porous titania beads were investigated, and the results indicated that the porous titania beads in size of about 15 μm are pure anatase phase and featured by two types of pores with macropores centered at about 200 nm and mesopores smaller than 10 nm. The bimodal pore structure is attributed to hard aggregates of titania particles with different size. In particular, the larger titania nanocrystals agglomerate into macropores and the smaller ones from crystal growth of coated titania into mesopores. Finally, after cation modification, the bimodal porous adsorbents (BPA) were evaluated for investigating chromatographic performance and compared to microporous ones (MPA). It was observed that static and dynamic adsorption capacities of cytochrome C on BPA are both larger than that on MPA. Moreover, the BPApacked column shows better column efficiency than the MPA packed one in test flow rates. Therefore, we demonstrated that the BPA occupies more advantages over the other one and is expected for potential application in chromatography. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158908