Description of chemically and thermally treated Multi-walled Carbon Nanotubes using sequential decomposition of adsorption isotherms

The effect of wet acid oxidation by means of sulfuric/nitric 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 trated MWCNTs, we employed a multistep method...

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Autores principales: Albesa, Alberto Gustavo, Rafti, Matías, Vicente, José Luis
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Exactas
Química
multi-walled carbon nanotubes
adsorption steps
isotherm decomposition
nitrogen adsorption
acid oxidation treatment
thermal treatment
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/151303
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-151303
record_format dspace
spelling I19-R120-10915-1513032023-04-11T20:08:24Z http://sedici.unlp.edu.ar/handle/10915/151303 issn:0218-625X issn:1793-6667 Description of chemically and thermally treated Multi-walled Carbon Nanotubes using sequential decomposition of adsorption isotherms Albesa, Alberto Gustavo Rafti, Matías Vicente, José Luis 2016 2023-04-11T18:08:41Z en Ciencias Exactas Química multi-walled carbon nanotubes adsorption steps isotherm decomposition nitrogen adsorption acid oxidation treatment thermal treatment The effect of wet acid oxidation by means of sulfuric/nitric 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 trated 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 Dubinins model, while high pressure regimes can be fitted using different models such as BET multilayer and Freundlich equations. This analysis allows elucidate how different substrate treatments (chemical and thermal) can affect the adsorbate-adsorbant 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 show also 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. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Articulo Preprint http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Química
multi-walled carbon nanotubes
adsorption steps
isotherm decomposition
nitrogen adsorption
acid oxidation treatment
thermal treatment
spellingShingle Ciencias Exactas
Química
multi-walled carbon nanotubes
adsorption steps
isotherm decomposition
nitrogen adsorption
acid oxidation treatment
thermal treatment
Albesa, Alberto Gustavo
Rafti, Matías
Vicente, José Luis
Description of chemically and thermally treated Multi-walled Carbon Nanotubes using sequential decomposition of adsorption isotherms
topic_facet Ciencias Exactas
Química
multi-walled carbon nanotubes
adsorption steps
isotherm decomposition
nitrogen adsorption
acid oxidation treatment
thermal treatment
description The effect of wet acid oxidation by means of sulfuric/nitric 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 trated 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 Dubinins model, while high pressure regimes can be fitted using different models such as BET multilayer and Freundlich equations. This analysis allows elucidate how different substrate treatments (chemical and thermal) can affect the adsorbate-adsorbant 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 show also 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.
format Articulo
Preprint
author Albesa, Alberto Gustavo
Rafti, Matías
Vicente, José Luis
author_facet Albesa, Alberto Gustavo
Rafti, Matías
Vicente, José Luis
author_sort Albesa, Alberto Gustavo
title Description of chemically and thermally treated Multi-walled Carbon Nanotubes using sequential decomposition of adsorption isotherms
title_short Description of chemically and thermally treated Multi-walled Carbon Nanotubes using sequential decomposition of adsorption isotherms
title_full Description of chemically and thermally treated Multi-walled Carbon Nanotubes using sequential decomposition of adsorption isotherms
title_fullStr Description of chemically and thermally treated Multi-walled Carbon Nanotubes using sequential decomposition of adsorption isotherms
title_full_unstemmed Description of chemically and thermally treated Multi-walled Carbon Nanotubes using sequential decomposition of adsorption isotherms
title_sort description of chemically and thermally treated multi-walled carbon nanotubes using sequential decomposition of adsorption isotherms
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/151303
work_keys_str_mv AT albesaalbertogustavo descriptionofchemicallyandthermallytreatedmultiwalledcarbonnanotubesusingsequentialdecompositionofadsorptionisotherms
AT raftimatias descriptionofchemicallyandthermallytreatedmultiwalledcarbonnanotubesusingsequentialdecompositionofadsorptionisotherms
AT vicentejoseluis descriptionofchemicallyandthermallytreatedmultiwalledcarbonnanotubesusingsequentialdecompositionofadsorptionisotherms
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