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Modification of carbon nanotubes for H2S sorption / Ali Mohamadalizadeh in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8050-8057 Titre : Modification of carbon nanotubes for H2S sorption Type de document : texte imprimé Auteurs : Ali Mohamadalizadeh, Auteur ; Jafar Towfighi, Auteur ; Alimorad Rashidi, Auteur Année de publication : 2011 Article en page(s) : pp. 8050-8057 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Sorption  Hydrogen  sulfides Résumé : Multiwall carbon nanotubes (MWNTs), prepared with methane as carbon source through the chemical vapor deposition (CVD) method at 900 °C, were functionalized to have amino and amido functional groups and then deposited with tungsten (W) nanoparticles. Pure H2S sorption on MWNTs, MWNTs loaded with W, functionalized MWNTs, and activated carbon (prepared from walnut shell) was investigated at 20 °C and a pressure range of 1-10 bar. X-ray diffraction, transmission and scanning electron microscopies, Raman spectroscopy, ASAP, inductively coupled plasma, and temperature-programmed reduction analysis were performed to determine the properties of the sorbent. The presence of amino functional groups was found to increase the sorption capacity of MWNTs, while the decoration of MWNTs with W nanoparticles decreased the sorption capacity. Results of the research revealed that functionalized MWNTs have a higher H2S sorption capacity than activated carbon. Langmuir, Freundlich, Unilan, Sips, and Toth isotherm models were used for a mathematical description of hydrogen sulfide equilibrium adsorption, and the experimental data for all four adsorbents showed the best accordance with the Freundlich model, while the Unilan model had the least accordance with the experimental data obtained for adsorbents based on MWNTs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332130 [article] Modification of carbon nanotubes for H2S sorption [texte imprimé] / Ali Mohamadalizadeh, Auteur ; Jafar Towfighi, Auteur ; Alimorad Rashidi, Auteur . - 2011 . - pp. 8050-8057. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8050-8057 Mots-clés : Sorption  Hydrogen  sulfides Résumé : Multiwall carbon nanotubes (MWNTs), prepared with methane as carbon source through the chemical vapor deposition (CVD) method at 900 °C, were functionalized to have amino and amido functional groups and then deposited with tungsten (W) nanoparticles. Pure H2S sorption on MWNTs, MWNTs loaded with W, functionalized MWNTs, and activated carbon (prepared from walnut shell) was investigated at 20 °C and a pressure range of 1-10 bar. X-ray diffraction, transmission and scanning electron microscopies, Raman spectroscopy, ASAP, inductively coupled plasma, and temperature-programmed reduction analysis were performed to determine the properties of the sorbent. The presence of amino functional groups was found to increase the sorption capacity of MWNTs, while the decoration of MWNTs with W nanoparticles decreased the sorption capacity. Results of the research revealed that functionalized MWNTs have a higher H2S sorption capacity than activated carbon. Langmuir, Freundlich, Unilan, Sips, and Toth isotherm models were used for a mathematical description of hydrogen sulfide equilibrium adsorption, and the experimental data for all four adsorbents showed the best accordance with the Freundlich model, while the Unilan model had the least accordance with the experimental data obtained for adsorbents based on MWNTs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332130