Effect of sonication and hydrogen peroxide oxidation of carbon nanotube modifiers on the microstructure of pitch-derived activated carbon foam discs

Gao, Shuai and Villacorta, Byron S. and Ge, Lei and Rufford, Thomas E. and Zhu, Zhonghua (2017) Effect of sonication and hydrogen peroxide oxidation of carbon nanotube modifiers on the microstructure of pitch-derived activated carbon foam discs. Carbon, 124. pp. 142-151. ISSN 0008-6223

Abstract

We used carbon nanotubes (CNTs) as modifying particles and potassium hydroxide as a porogen to prepare mesoporous pitch-derived activated carbon discs (ACD) with high surface areas. The parameters investigated in this study included the concentration of CNTs (1%, 2%, 3.5% and 5%), the dispersion of the CNTs in the pitch using a 750 W sonic probe, the oxidation of the CNTs with H2O2, and the aspect ratio of the CNTs. The highest surface area ACD was obtained with 2% oxidized CNTs dispersed in the pitch with the ultrasonic probe (ACD-2%-SO, SBET = 2089 m2 g−1). The ACDs prepared with the sonic probe and with 2 wt% or more of raw and oxidized CNTs exhibited larger mesopore volumes than those ACDs prepared with 1 wt% CNTs. A series of quench tests performed during the foaming process by withdrawal of the carbon from the tube furnace at 673 K, 773 K and 873 K revealed that mesopores in ACD develop at temperatures ranging from 773 K to 873 K, whereas micropores formed between 873 K and 1073 K. The adsorption capacities of N2 and CO2 on ACD-2%-SO were measured with a gravimetric apparatus at 298 K and 303 K at pressures up to 4000 kPa. The uptake of CO2 on ACD-2%-SO at a temperature of 298 K was 3.33 mol/kg at 100 kPa and 11.51 mol/kg at 3496 kPa.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 18 Dec 2017 05:52
Last Modified: 24 Apr 2018 04:36
Uncontrolled Keywords: carbon nanotubes; sonification; carbon foam discs; porogens
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090404 Membrane and Separation Technologies
Socio-Economic Objective: D Environment > 96 Environment > 9603 Climate and Climate Change > 960302 Climate Change Mitigation Strategies
Identification Number or DOI: 10.1016/j.carbon.2017.08.036
URI: http://eprints.usq.edu.au/id/eprint/33061

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