Journal
APPLIED CLAY SCIENCE
Volume 95, Issue -, Pages 252-259Publisher
ELSEVIER
DOI: 10.1016/j.clay.2014.04.019
Keywords
Halloysite nanotubes; Metal oxides; Functionalization; Carbon coating; Photocatalytic degradation
Funding
- National Science Fund for Distinguished Young Scholars [51225403]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120162110079]
- Hunan Provincial Natural Science Fund for Innovative Research Groups
- Scholarship Award for Excellent Doctoral Student - Ministry of Education [1343-76140000026]
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Halloysite nanotubes (HNTs) can serve as high aspect ratio templates for the deposition of functional nanopartides to form novel nanocomposites. We reported here on the synthesis of carbon-coated HNTs (CCH) via the carbonization of sucrose-coated HNTs in the presence of sulfuric acid. Metal oxide (MO) nanoparticles (ZnO, TiO2) were subsequently deposited on the surface of the CCH to produce MO/CCH nanocomposites. The samples were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, and N-2 adsorption-desorption analysis. The results indicated that graphitic carbon could improve the conductivity of HNTs, and electron transfer across the interfaces between MO and graphitic carbon led to a significant change in photocatalytic properties. MO/CCH showed good photocatalytic performance for photodegradation of methylene blue dye. The nanocomposites had two excellent advantages as a result of the unique properties of carbon, and increased adsorption of pollutants and easy charge transportation. The as-synthesized nanocomposites could have potential application in the field of wastewater treatment. (C) 2014 Elsevier B.V. All rights reserved.
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