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Artículo

Description of chemically and thermally treated multi-walled carbon nanotubes using sequential decomposition of adsorption isotherms

Albesa, Alberto GustavoIcon ; Rafti, MatiasIcon ; Vicente, Jose Luis
Fecha de publicación: 08/2016
Editorial: World Scientific
Revista: Surface Review And Letters
ISSN: 0218-625X
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
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Resumen

The effect of wet acid oxidation by means of sulfuric/nitric acid mixtures, and high-temperature treatment of commercial arc-discharge synthesized multi-walled carbon nanotubes (MWCNTs) was studied. In order to analyze the adsorption capacities of differently treated MWCNTs, we employed a multistep method that considers separately different pressure ranges (zones) on the experimentally obtained isotherms. The method is based on simple gas isotherm measurements (N2, CO2, CH4, etc.). Low pressure ranges can be described using Dubinin's model, while high pressure regimes can be fitted using different models such as BET multilayer and Freundlich equations. This analysis allows to elucidate how different substrate treatments (chemical and thermal) can affect the adsorbate-adsorbent interactions; moreover, theoretical description of adsorbate-adsorbate interactions can be improved if a combination of adsorption mechanisms are used instead of a unique model. The results hereby presented also show that, while MWCNTs are a promising material for storage applications, gas separation applications should carefully consider the effect of wide nanotube size distribution present on samples after activation procedures.
Palabras clave: Acid Oxidation Treatment , Adsorption Steps , Isotherm Decomposition , Multi-Walled Carbon Nanotubes , Nitrogen Adsorption , Thermal Treatment
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
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URI: http://hdl.handle.net/11336/62140
DOI: https://dx.doi.org/10.1142/S0218625X16500256
URL: https://www.worldscientific.com/doi/abs/10.1142/S0218625X16500256
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Citación
Albesa, Alberto Gustavo; Rafti, Matias; Vicente, Jose Luis; Description of chemically and thermally treated multi-walled carbon nanotubes using sequential decomposition of adsorption isotherms; World Scientific; Surface Review And Letters; 23; 4; 8-2016; 1-8
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