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Open AccessArticle

Enhanced CO2 Adsorption on Activated Carbon Fibers Grafted with Nitrogen-Doped Carbon Nanotubes

Department of Mechanical Engineering, Yuan Ze University, Chung-Li, Taoyuan 32003, Taiwan
Fuel Cell Center, Yuan Ze University, Chung-Li, Taoyuan 32003, Taiwan
Department of Mechanical Engineering, Hwa Hsia Institute of Technology, Chung-Ho, New Taipei City 235, Taiwan
Department of Chemical and Materials Engineering, Chang Gung University, Guishan, Taoyuan 33302, Taiwan
Division of Nephrology, Department of Internal Medicine, Chang Gung Memorial Hospital, Linkou 33305, Taiwan
Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, Taishan, New Taipei City 24301, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Klara Hernadi
Materials 2017, 10(5), 511;
Received: 6 April 2017 / Revised: 3 May 2017 / Accepted: 5 May 2017 / Published: 7 May 2017
(This article belongs to the Special Issue Sorption Materials for Environment Purification)
In this paper, multiscale composites formed by grafting N-doped carbon nanotubes (CNs) on the surface of polyamide (PAN)-based activated carbon fibers (ACFs) were investigated and their adsorption performance for CO2 was determined. The spaghetti-like and randomly oriented CNs were homogeneously grown onto ACFs. The pre-immersion of cobalt(II) ions for ACFs made the CNs grow above with a large pore size distribution, decreased the oxidation resistance, and exhibited different predominant N-functionalities after chemical vapor deposition processes. Specifically, the CNs grafted on ACFs with or without pre-immersion of cobalt(II) ions were characterized by the pyridine-like structures of six-member rings or pyrrolic/amine moieties, respectively. In addition, the loss of microporosity on the specific surface area and pore volume exceeded the gain from the generation of the defects from CNs. The adsorption capacity of CO2 decreased gradually with increasing temperature, implying that CO2 adsorption was exothermic. The adsorption capacities of CO2 at 25 °C and 1 atm were between 1.53 and 1.92 mmol/g and the Freundlich equation fit the adsorption data well. The isosteric enthalpy of adsorption, implying physical adsorption, indicated that the growth of CNTs on the ACFs benefit CO2 adsorption. View Full-Text
Keywords: activated carbon fibers; carbon nanotubes; composites; carbon dioxide; adsorption activated carbon fibers; carbon nanotubes; composites; carbon dioxide; adsorption
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Chiang, Y.-C.; Hsu, W.-L.; Lin, S.-Y.; Juang, R.-S. Enhanced CO2 Adsorption on Activated Carbon Fibers Grafted with Nitrogen-Doped Carbon Nanotubes. Materials 2017, 10, 511.

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