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NaOH - activated carbon of high surface area produced from coconut shell / André L. Cazetta in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.117-125 Titre : NaOH - activated carbon of high surface area produced from coconut shell : Kinetics and equilibrium studies from the methylene blue adsorption Type de document : texte imprimé Auteurs : André L. Cazetta, Auteur ; Alexandro M.M. Vargas, Auteur ; Eurica M. Nogami, Auteur Année de publication : 2012 Article en page(s) : pp.117-125 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : NaOH-activated  carbon  Coconut  shell  Methylene  blue  Adsorption Résumé : Activatedcarbons (ACs) of coconutshellproduced by NaOH activation at impregnation ratios of NaOH:char (w/w) equal to 1:1 (AC-1), 2:1 (AC-2) and 3:1 (AC-3) were prepared. The properties of these carbons, including BET surfacearea, pore volume, pore size distribution, and pore diameter, were characterized from N2 adsorption isotherms. It was found that the ACs are essentially microporous and that the BET surfacearea was in order of 783 m2 g−1 for AC-1, 1842 m2 g−1 for AC-2, and 2825 m2 g−1 for AC-3. Scanning electron microscopy images showed a high pore development while Boehm method and Fourier-transform infrared spectroscopy spectra indicated the presence of acid functional groups which was confirmed by pH drift method. The adsorption equilibrium and kinetics of methylene blue (MB) onto AC-3 were carried out. Experimental data were fitted to the four isotherm models (Langmuir, Freundlich, Toth and Redlich–Peterson), and was found that Langmuir model presented the best fit, showing maximum monolayer adsorption capacity of 916 mg g−1. The kinetic studies showed that experimental data follow pseudo-second-order model. The mechanism of the adsorption process was described from the intraparticle diffusion model. The AC-3 has a highsurfacearea and showed to be an efficient adsorbent for removal of MB from aqueous solutions. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010163 [article] NaOH - activated carbon of high surface area produced from coconut shell : Kinetics and equilibrium studies from the methylene blue adsorption [texte imprimé] / André L. Cazetta, Auteur ; Alexandro M.M. Vargas, Auteur ; Eurica M. Nogami, Auteur . - 2012 . - pp.117-125. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.117-125 Mots-clés : NaOH-activated  carbon  Coconut  shell  Methylene  blue  Adsorption Résumé : Activatedcarbons (ACs) of coconutshellproduced by NaOH activation at impregnation ratios of NaOH:char (w/w) equal to 1:1 (AC-1), 2:1 (AC-2) and 3:1 (AC-3) were prepared. The properties of these carbons, including BET surfacearea, pore volume, pore size distribution, and pore diameter, were characterized from N2 adsorption isotherms. It was found that the ACs are essentially microporous and that the BET surfacearea was in order of 783 m2 g−1 for AC-1, 1842 m2 g−1 for AC-2, and 2825 m2 g−1 for AC-3. Scanning electron microscopy images showed a high pore development while Boehm method and Fourier-transform infrared spectroscopy spectra indicated the presence of acid functional groups which was confirmed by pH drift method. The adsorption equilibrium and kinetics of methylene blue (MB) onto AC-3 were carried out. Experimental data were fitted to the four isotherm models (Langmuir, Freundlich, Toth and Redlich–Peterson), and was found that Langmuir model presented the best fit, showing maximum monolayer adsorption capacity of 916 mg g−1. The kinetic studies showed that experimental data follow pseudo-second-order model. The mechanism of the adsorption process was described from the intraparticle diffusion model. The AC-3 has a highsurfacearea and showed to be an efficient adsorbent for removal of MB from aqueous solutions. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010163