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Selective synthesis of nanosized TiO2 by hydrothermal route: Characterization, structure property relation, and photochemical application

Published online by Cambridge University Press:  03 March 2011

K. Madhusudan Reddy ,
Debanjan Guin ,
Sunkara V. Manorama  and
A. Ramachandra Reddy
K. Madhusudan Reddy
Affiliation:
Nanomaterials Laboratory, Indian Institute of Chemical Technology, Hyderabad 500007, India
Debanjan Guin
Affiliation:
Nanomaterials Laboratory, Indian Institute of Chemical Technology, Hyderabad 500007, India
Sunkara V. Manorama*
Affiliation:
Nanomaterials Laboratory, Indian Institute of Chemical Technology, Hyderabad 500007, India
A. Ramachandra Reddy
Affiliation:
Department of Physics, National Institute of Technology, Warangal, Andhrapradesh 506004, India
*
a) Address all correspondence to this author.e-mail: manorama@iict.res.in
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Abstract

By variation of reaction temperature and time during the hydrothermal synthesis process, TiO2 nanoparticles in anatase, rutile, and mixture of rutile-anatase phases are formed without adding any mineralizer. Differential thermal analysis studies indicate the rutile phase crystallization at a comparatively lower temperature and a low weight loss. The material synthesized by hydrothermal reaction required no post-calcination for the crystallization. Transmission electron microscopy, selected-area diffraction, Brunauer–Emmett–Teller, and x-ray diffreaction studies confirmed the compositions to be anatase and rutile with the particle size ranging from 5 to 25 nm with surface area as high as 260 m2/g for the anatase and 65 m2/g for rutile. The prepared nanoparticles exhibited a blue shift of the absorption edge in the ultraviolet-visible spectrum greater than 10 nm. The particles with average size around 5 nm showed two band edges in the absorption spectra attributed to two different particle sizes. Simple photocatalytic reactions were tried to demonstrate the photochemical activity of the synthesized material. The synthesized nanoparticles exhibited an ultraviolet radiation simultaneous photoreduction of Cr(VI) to Cr(III) and oxidation of formic acid into carbon dioxide and water.

Keywords

NanoparticleSemiconductorHydrothermal
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 9 , September 2004 , pp. 2567 - 2575
Copyright
Copyright © Materials Research Society 2004

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