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Open AccessArticle

CVD Synthesis, Functionalization and CO2 Adsorption Attributes of Multiwalled Carbon Nanotubes

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Department of Physics, University of Agriculture, Faisalabad 38040, Pakistan
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Center of Innovative Nanostructures and Nanodevices, Universiti Teknologi PETRONAS, Perak 32610, Malaysia
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College of Engineering, Muzahimiyah Branch, King Saud University, Riyadh 11451, Saudi Arabia
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Arriyadh Community College, King Saud University, Arriyadh 11437, Saudi Arabia
*
Author to whom correspondence should be addressed.
Processes 2019, 7(9), 634; https://doi.org/10.3390/pr7090634
Received: 22 August 2019 / Revised: 5 September 2019 / Accepted: 10 September 2019 / Published: 18 September 2019
(This article belongs to the Section Materials Processes)
Carbon dioxide is one of the major greenhouse gases and a leading source of global warming. Several adsorbent materials are being tested for removal of carbon dioxide (CO2) from the atmosphere. The use of multiwalled carbon nanotubes (MWCNTs) as a CO2 adsorbent material is a relatively new research avenue. In this study, Fe2O3/Al2O3 composite catalyst was used to synthesize MWCNTs by cracking ethylene gas molecules in a fluidized bed chemical vapor deposition (CVD) chamber. These nanotubes were treated with H2SO4/HNO3 solution and functionalized with 3-aminopropyl-triethoxysilane (APTS). Chemical modification of nanotubes removed the endcaps and introduced some functional groups along the sidewalls at defected sites. The functionalization of nanotubes with amine introduced carboxylic groups on the tube surface. These functional groups significantly enhance the surface wettability, hydrophilicity and CO2 adsorption capacity of MWCNTs. The CO2 adsorption capacity of as-grown and amine-functionalized CNTs was computed by generating their breakthrough curves. BELSORP-mini equipment was used to generate CO2 breakthrough curves. The oxidation and functionalization of MWCNTs revealed significant improvement in their adsorption capacity. The highest CO2 adsorption of 129 cm3/g was achieved with amine-functionalized MWCNTs among all the tested samples. View Full-Text
Keywords: fluidized bed CVD; MWCNTs; functionalized CNTs; CO2 adsorption capacity fluidized bed CVD; MWCNTs; functionalized CNTs; CO2 adsorption capacity
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MDPI and ACS Style

Shukrullah, S.; Naz, M.Y.; Mohamed, N.M.; Ibrahim, K.A.; AbdEl-Salam, N.M.; Ghaffar, A. CVD Synthesis, Functionalization and CO2 Adsorption Attributes of Multiwalled Carbon Nanotubes. Processes 2019, 7, 634.

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