DBPapers
DOI: 10.5593/sgem2012/s12.v3003

HALLOYSITE–TIO2 NANOCOMPOSITES: SYNTHESIS AND CHARACTERIZATION

D. PAPOULIS, S. KOMARNENI, D. PANAGIOTARAS, H. KATSUKI
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 3, 459 - 466 pp

ABSTRACT

In this paper we describe the synthesis and characterization of nano-sized TiO2 particles
supported on Halloysite with halloysite to TiO2 weight ratios of 30:70. Two halloysite-
TiO2 nanocomposites were prepared using two different halloysites (from Limnos island
Greece and from Utah, USA). Both halloysite - TiO2 nanocomposites were prepared by
deposition of anatase form of TiO2 on the halloysite surfaces using a sol–gel method
with titanium isopropoxide as a precursor under hydrothermal treatment at 180 °C.
Phase composition, particle morphology and physical properties of these samples were
characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM),
Transmission Electron Microscopy (TEM), Attenuated Total Reflection using Fourier
Transform Infrared spectroscopy (ATR-FTIR) and N2 specific surface area (SSA)
analysis by BET. Preparation of halloysite–TiO2 nanocomposites led to good dispersion
of 3-10nm TiO2 particles on halloysite surfaces. ATR-FTIR results indicated the
formation of hydrogen bonding between the outer surfaces of halloysite tubes and TiO2.
After compositing with TiO2 both halloysite samples largely showed interparticle
mesopores of about 5.7nm, while halloysite from Utah, USA retained a higher SSA
compared to the one from Limnos island Greece.

Keywords: Halloysite, Anatase, Titania, Nanocomposite, Photocatalytic activity