Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 370, Issue -, Pages 32-38Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.12.073
Keywords
Carbon nanotubes; Surface functionalization; Oxygen-containing functional groups; Chemical oxidization; Surface hydrophilicity
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Funding
- Natural Science Foundation of China [20006012]
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The surface of carbon nanotubes (CNTs) was functionalized in different chemical oxidants, hydrogen peroxide, mixed concentrated HNO3/H2SO4 and acidic KMnO4 solution. The influences on the properties of CNTs were systematically investigated, such as the structure, the kinds and the contents of the formed surface oxygen-containing functional groups, the pH(PZC) values and the surface hydrophilicity using XRD, HREM, FTIR and chemical titration. The results show that the kinds and the contents of the surface oxygen-containing groups are dependent on the functionalization methods. The formation of the oxygen-containing groups can decrease pH(PZC) values and improve surface hydrophilicity of CNTs. The dispersion of the supported Pd-Pt particles on the functionalized CNTs and their catalytic activity in the profile reaction of naphthalene hydrogenation to tetralin are both promoted due to the presence of these oxygen-containing groups. (C) 2012 Elsevier Inc. All rights reserved.
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