Toggle Main Menu Toggle Search

Open Access padlockePrints

Preparation, characterization and photocatalytic activity of TiO 2 / Methylcellulose nanocomposite films derived from nanopowder TiO2 and modified sol-gel titania

Lookup NU author(s): Professor Mohammad Habibi, Dr Terry Egerton


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


TiO2-methylcellulose (MC) nanocomposite films processed by the sol-gel technique were studied for phocatalytic applications. Precalcined TiO2 nanopowder was mixed with a sol and heat treated. The sol suspension was prepared by first adding titanium tetra isopropoxide (Ti(OPr)4 or TTP) to a mixture of ethanol and HCl (molar ratio TTP:HCl:EtOH:H2O = 1:1.1:10:10) and then adding a 2 wt.% solution of methylcellulose (MC). The TiO2 nanopowder was dispersed in the sol and the mixture was deposited on a microscope glass slide by spin coating. Problems of film inhomogeneity and defects which caused peeling and cracking during calcinations, because of film shrinkage, were overcome by using MC as a dispersant. Effect of MC on the structure evaluation, crystallization behavior and mechanical integrity with thermal treatment up to 500°C are followed by SEM, XRD and scratch test. XRD Scanning electron microscopy (SEM) showed that the composite films with MC have much rougher surface than films made without MC. Composite films heat treated at approximately 500°C have the greatest hardness values. For the composite thick film, the minimum load which caused the complete coating removal was 200 g/mm2, an indication of a strong bond to the substrate. Photocatalytic activities of the composite film were evaluated through the degradation of a model pollutant, the textile dye, Light Yellow X6G (C.I. Reactive Yellow 2) and were compared with the activity of (i) a similar composite film without MC, and (ii) a TiO2 nanopowder. The good mechanical integrity make this composite film an interesting candidate for practical catalytic applications. © Springer Science+Business Media, LLC 2007.

Publication metadata

Author(s): Habibi MH, Nasr-Esfahani M, Egerton TA

Publication type: Article

Publication status: Published

Journal: Journal of Materials Science

Year: 2007

Volume: 42

Issue: 15

Pages: 6027-6035

ISSN (print): 0022-2461

ISSN (electronic): 1573-4803

Publisher: Springer New York LLC


DOI: 10.1007/s10853-006-1149-6


Altmetrics provided by Altmetric