Simple Metal-catalyst-free Production of Carbon Nanostructures
Thomas K. Ellis A , Christian Paras B , Matthew R. Hill B and John A. Stride A C DA School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
B CSIRO Division of Materials Science and Engineering, Private Bag 33, Clayton South MDC, Vic. 3169, Australia.
C Bragg Institute, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, Australia.
D Corresponding author. Email: j.stride@unsw.edu.au
Australian Journal of Chemistry 66(11) 1435-1439 https://doi.org/10.1071/CH13332
Submitted: 28 June 2013 Accepted: 1 August 2013 Published: 16 September 2013
Abstract
We report the metal-catalyst-free production of multiwalled carbon nanotubes and nanobubbles, in a chemical reduction of hexachlorobenzene by metallic sodium, giving high yields (in excess of 80 %) and at temperatures as low as 190°C for multiwalled carbon nanotubes and 100°C for nanobubble formation. The carbon nanotube samples produced under solvothermal conditions were found to consist of large bundles of nanotubes (>50 µm) consistent with a facial growth from the surface of the molten metal. Meanwhile, the nanobubbles produced under ambient pressure were found to be small (≤1 µm), polydispersed (smallest ~50 nm), and the bulk to have a large microporous area. With the regulatory complexities and high environmental and economic costs of remediating waste containing highly hazardous halogenated aromatic chemicals, necessitating high-temperature incineration under strictly controlled conditions, this low-temperature, low-cost chemical degradation of hexachlorobenzene is of great potential as a scalable and workable remediation technology.
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