Exploring anatase-TiO2 doped dilutely with transition metal ions as nano-catalyst for H2O2 decomposition: Spectroscopic and kinetic studies

Authors: M.I. Zaki, A. Katrib, A.I. Muftah, T.C. Jagadale, M. Ikram, S.B. Ogale

Abstract:
Pure and dilutely doped nano anatase-TiO₂ with 3 at% Nb, Cr, Fe, Ni, Mn, Co or Cu ions were prepared by sol–gelprocessing. Thedoping was foundbyX-raydiffractometry andlaserRamanspectroscopy to reduce the average crystallite size of the titania (8 nm) down to <8–3 nm without formation of separate or mixed oxide phases and without deviation from the anatase structure of the titania. Ion scattering spectroscopy observed surface exposure of the dopant ions, but only Mn, Co or Cu dopant ions were found by X-ray photoelectron spectroscopy to form oxygen-mediated bonds with titanium ions. The likely facilitation of d–d electron exchange interactions via such dopant–O–Ti linkages is suggested to provide the necessary bulk and surface attributes for the observed rendering of the host anatase-TiO₂ a visible light absorber (as revealed by UV-visible diffuse reflectance spectroscopy) and an active heterogeneous catalyst for H₂O₂ decomposition (as revealed by gravimetric gasometry of the decomposition reaction). These two dopantmediated behaviors were exhibited uniquely by the anatase-TiO₂ nanoparticles after doping with Mn, Co or Cu ions.

Keywords:
Transition metal
Dopants
Anatase-TiO₂
Catalysis
H₂O₂ decomposition

Published in: Applied catalysis A: General  (Volume 452, Pages 1-222, 15 February 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Exploring anatase-TiO2 doped dilutely with transition metal ions as nano-catalyst for H2O2 decomposition: Spectroscopic and kinetic studies

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