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Fabrication and evaluation of mesoporous poly(vinyl alcohol)-based activated carbon fibers / Hui-Min Feng in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3398–3402 Titre : Fabrication and evaluation of mesoporous poly(vinyl alcohol)-based activated carbon fibers Type de document : texte imprimé Auteurs : Hui-Min Feng, Auteur ; Shu-Juan Zhang, Auteur ; Yong-Zhen Chen, Auteur Année de publication : 2009 Article en page(s) : pp. 3398–3402 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Activated  carbon  fibers  Mesoporous  poly(vinyl  alcohol)  Raman  spectroscopy Résumé : Poly(vinyl alcohol)- (PVA-) based activated carbon fibers (ACFs) with a high mesoporosity have been fabricated. The surface area and pore size distribution were fine-tuned by the careful control of the activation temperature and time. A mesopore volume fraction of 66% was obtained by activation at 1173 K for 120 min or 1273 K for 90 min. Raman spectroscopy revealed that more defect sites in the graphitic structure were found in samples with higher mesoporosity. Adsorption experiments demonstrated that the PVA-ACFs exhibited good adsorption capacities for both small-molecular-size iodine and the larger-size methylene blue, with adsorption capacities of up to 1934 and 709 mg/g, respectively. The adsorption kinetics of methylene blue on the PVA-ACFs was simulated by both a pseudo-second-order kinetic model and an intraparticle diffusion model. With an increase in mesoporosity, rate limitations on adsorption due to intraparticle diffusion were dramatically reduced. This resulted in an increase of up to a factor of 7 in the adsorption rate compared to that on microporous PVA-based ACFs. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8012852 [article] Fabrication and evaluation of mesoporous poly(vinyl alcohol)-based activated carbon fibers [texte imprimé] / Hui-Min Feng, Auteur ; Shu-Juan Zhang, Auteur ; Yong-Zhen Chen, Auteur . - 2009 . - pp. 3398–3402. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3398–3402 Mots-clés : Activated  carbon  fibers  Mesoporous  poly(vinyl  alcohol)  Raman  spectroscopy Résumé : Poly(vinyl alcohol)- (PVA-) based activated carbon fibers (ACFs) with a high mesoporosity have been fabricated. The surface area and pore size distribution were fine-tuned by the careful control of the activation temperature and time. A mesopore volume fraction of 66% was obtained by activation at 1173 K for 120 min or 1273 K for 90 min. Raman spectroscopy revealed that more defect sites in the graphitic structure were found in samples with higher mesoporosity. Adsorption experiments demonstrated that the PVA-ACFs exhibited good adsorption capacities for both small-molecular-size iodine and the larger-size methylene blue, with adsorption capacities of up to 1934 and 709 mg/g, respectively. The adsorption kinetics of methylene blue on the PVA-ACFs was simulated by both a pseudo-second-order kinetic model and an intraparticle diffusion model. With an increase in mesoporosity, rate limitations on adsorption due to intraparticle diffusion were dramatically reduced. This resulted in an increase of up to a factor of 7 in the adsorption rate compared to that on microporous PVA-based ACFs. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8012852