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Open AccessArticle

Synthesis of Carbon Nanotube Arrays with High Aspect Ratio via Ni-Catalyzed Pyrolysis of Waste Polyethylene

1
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2
College of Engineering, Mathematics and Physical Sciences, University of Exeter, ExeterEX4 4QF, UK
*
Authors to whom correspondence should be addressed.
Nanomaterials 2018, 8(7), 556; https://doi.org/10.3390/nano8070556
Received: 22 June 2018 / Revised: 16 July 2018 / Accepted: 18 July 2018 / Published: 21 July 2018
(This article belongs to the Special Issue Nanostructured Porous Carbon based 3D Architectures)
Carbon nanotube (CNT) arrays 30–50 nm in diameter and with a length of several micrometers were prepared by catalytic pyrolysis of waste polyethylene in Ar at 773−1073 K using nickel dichloride as a catalyst precursor. X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectrometry (Raman), a vibrating-sample magnetometer (VSM), and nitrogen adsorption/desorption were used to investigate the effects of the pyrolysis temperature and catalyst contents on the preparation of the aligned CNTs. As results, the as-obtained CNTs had an outer diameter of 30 nm, a wall thickness of 10 nm, and a length of about 50 μm, and their aspect ratio was high up to 1500. The aligned CNTs containing 0.75 wt% Ni prepared at 973 K exhibited good adsorption performance for methylene blue (MB); furthermore, benefiting from the special magnetic properties of residual Ni catalysts, the as-obtained CNTs could be easily magnetically recycled from the treated solution after adsorption. View Full-Text
Keywords: carbon nanotubes; nickel dichloride; waste polyethylene; catalytic pyrolysis; adsorption; magnetically recycle carbon nanotubes; nickel dichloride; waste polyethylene; catalytic pyrolysis; adsorption; magnetically recycle
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MDPI and ACS Style

Zheng, Y.; Zhang, H.; Ge, S.; Song, J.; Wang, J.; Zhang, S. Synthesis of Carbon Nanotube Arrays with High Aspect Ratio via Ni-Catalyzed Pyrolysis of Waste Polyethylene. Nanomaterials 2018, 8, 556.

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