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Low-cost carbon nanospheres for efficient removal of organic dyes from aqueous solutions / Xianghua Song in Industrial & engineering chemistry research, Vol. 51 N° 41 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 41 (Octobre 2012) . - pp. 13438-13444 Titre : Low-cost carbon nanospheres for efficient removal of organic dyes from aqueous solutions Type de document : texte imprimé Auteurs : Xianghua Song, Auteur ; Yabo Wang, Auteur ; Kean Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 13438-13444 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Aqueous  solution  Organic  dye Résumé : Colloidal carbon nanospheres (CNS) with rich surface functional groups of ―OH and ―COO― were prepared from glucose solution via hydrothermal reaction and activated by NaOH solution. The nonporous CNS exhibited excellent adsorption performance toward basic dyes. High maximum adsorption capacities were obtained at 682 mg g―1 for Methylene blue, 395 mg g―1 for Methyl violet 2B, and 310 mg g―1 for Malachite green. Methylene blue with an initial concentration of 94 mg L―1 can be completely removed in 5 min at a dosage of 0.5 g L―1. This can be associated with the low mass transfer resistance due to the nonporous structure and the abundant surface active sites. The adsorption process is chemisorption in nature, while the kinetic data were well fitted to pseudosecond-order kinetic model. This material presented excellent adsorption capacities toward basic dyes with maximum adsorption capacity of 682 mg g―1 for Methylene blue B, 310 mg g―1 for Malachite green, and 395 mg g―1 for Methyl violet 2B. Furthermore, the dye saturated CNS was regenerated using an advanced oxidation method using Co2+ in aqueous solution as a homogeneous catalyst. After seven recycle runs, there was still 96% of adsorption capacity retained. The low-cost CNS nanomaterial has the potential to be applied as a new type of efficient adsorbent for water treatment. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26493637 [article] Low-cost carbon nanospheres for efficient removal of organic dyes from aqueous solutions [texte imprimé] / Xianghua Song, Auteur ; Yabo Wang, Auteur ; Kean Wang, Auteur . - 2012 . - pp. 13438-13444. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 41 (Octobre 2012) . - pp. 13438-13444 Mots-clés : Aqueous  solution  Organic  dye Résumé : Colloidal carbon nanospheres (CNS) with rich surface functional groups of ―OH and ―COO― were prepared from glucose solution via hydrothermal reaction and activated by NaOH solution. The nonporous CNS exhibited excellent adsorption performance toward basic dyes. High maximum adsorption capacities were obtained at 682 mg g―1 for Methylene blue, 395 mg g―1 for Methyl violet 2B, and 310 mg g―1 for Malachite green. Methylene blue with an initial concentration of 94 mg L―1 can be completely removed in 5 min at a dosage of 0.5 g L―1. This can be associated with the low mass transfer resistance due to the nonporous structure and the abundant surface active sites. The adsorption process is chemisorption in nature, while the kinetic data were well fitted to pseudosecond-order kinetic model. This material presented excellent adsorption capacities toward basic dyes with maximum adsorption capacity of 682 mg g―1 for Methylene blue B, 310 mg g―1 for Malachite green, and 395 mg g―1 for Methyl violet 2B. Furthermore, the dye saturated CNS was regenerated using an advanced oxidation method using Co2+ in aqueous solution as a homogeneous catalyst. After seven recycle runs, there was still 96% of adsorption capacity retained. The low-cost CNS nanomaterial has the potential to be applied as a new type of efficient adsorbent for water treatment. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26493637

The fixed-bed study of dye removal on chitosan beads at high pH / Dan Xu ; San Hein ; Sunsun Leslie Loo ; Kean Wang in Industrial & engineering chemistry research, Vol. 47 n°22 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8796–8800 Titre : The fixed-bed study of dye removal on chitosan beads at high pH Type de document : texte imprimé Auteurs : Dan Xu, Auteur ; San Hein, Auteur ; Sunsun Leslie Loo, Auteur ; Kean Wang, Auteur Année de publication : 2008 Article en page(s) : p. 8796–8800 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Beads  High  pH Résumé : Chitosan hydrogel beads were modified with ammonium sulfate to remove a dye (Acid Orange-7) in aqueous solutions at pH 8.2. The modified beads present much higher sorption capacity than the native beads in the basic solution. The sorption equilibrium was measured in a batch adsorber, and kinetics was investigated in a fixed bed rig. The breakthrough curves were found to be J-shaped in general and were modeled by the Wheeler−Jonas equation with a two-segmented approach. Analysis shows that the kinetics is controlled by film resistance and intraparticle diffusion in each segment, respectively. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800387z [article] The fixed-bed study of dye removal on chitosan beads at high pH [texte imprimé] / Dan Xu, Auteur ; San Hein, Auteur ; Sunsun Leslie Loo, Auteur ; Kean Wang, Auteur . - 2008 . - p. 8796–8800. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8796–8800 Mots-clés : Beads  High  pH Résumé : Chitosan hydrogel beads were modified with ammonium sulfate to remove a dye (Acid Orange-7) in aqueous solutions at pH 8.2. The modified beads present much higher sorption capacity than the native beads in the basic solution. The sorption equilibrium was measured in a batch adsorber, and kinetics was investigated in a fixed bed rig. The breakthrough curves were found to be J-shaped in general and were modeled by the Wheeler−Jonas equation with a two-segmented approach. Analysis shows that the kinetics is controlled by film resistance and intraparticle diffusion in each segment, respectively. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800387z