Publication: Separation and purification of carbon nanotubes using froth flotation with three sequential pretreatment steps of catalyst oxidation, catalyst removal, and silica dissolution
Issued Date
2013-11-01
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ISSN
19322143
19322135
19322135
DOI
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2-s2.0-84890554924
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Mahidol University
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SCOPUS
Bibliographic Citation
Asia-Pacific Journal of Chemical Engineering. Vol.8, No.6 (2013), 830-842
Suggested Citation
Nattapong Lertrojanachusit, Orathai Pornsunthorntawee, Boonyarach Kitiyanan, Jittipan Chavadej, Sumaeth Chavadej Separation and purification of carbon nanotubes using froth flotation with three sequential pretreatment steps of catalyst oxidation, catalyst removal, and silica dissolution. Asia-Pacific Journal of Chemical Engineering. Vol.8, No.6 (2013), 830-842. doi:10.1002/apj.1727 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/31462
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Title
Separation and purification of carbon nanotubes using froth flotation with three sequential pretreatment steps of catalyst oxidation, catalyst removal, and silica dissolution
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Abstract
Carbon nanotubes (CNTs) with a carbon content of 3% were synthesized via the disproportionation of CO over a CoMo/SiO2 catalyst. The proposed purification technique consisted of four sequential steps: oxidative treatment, acid leaching, silica dissolution, and froth flotation. The as-synthesized CNTs were oxidized at 250 °C before being treated with a 5-m HCl solution at 80 °C and a sonication time of 6 h, resulting in a catalyst removal of 90% and an increase in carbon content to 4%. For the silica dissolution, the CNTs were treated with a 0.5-m NaOH solution at 70 °C and a sonication time of 12 h, leading to a silica removal of 70% and an increase in carbon content to 35%. The froth flotation technique was employed to separate the CNTs from the remaining silica using two types of surfactants: linear ethoxylated alcohol with an average degree of polymerization of 7 and a linear alkyl chain of 12-14 carbon number (Surfonic L24-7) and sodium dodecyl benzene sulfonate (SDBS). The separation performance was maximized at a Surfonic L24-7-to-SDBS molar ratio of 1: 12 with a total surfactant concentration of 230 mg/L, yielding a carbon content of 76%. © 2013 Curtin University of Technology and John Wiley & Sons, Ltd.