Sol-gel synthesis, characterisation and photocatalytic activity of pure, W-, Ag- and W/Ag co-doped TiO2 nanopowders

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abstract

Tungsten, silver and tungsten/silver co-doped titania nanopowders were synthesised via an aqueous sol-gel method. The size distribution and zeta potential of the starting sols were determined via photon correlation spectroscopy (PCS). The dried gels were thermally treated at two different temperatures, and the occurrence of amorphous phase was assessed using the combined Rietveld-RIR X-ray powder diffraction method. A systematic study of the optical properties of the powders was made with diffuse reflectance spectroscopy (DRS), and the energy band gaps were calculated using the differential reflectance method; while their morphology was investigated using electron microscopy analysis (TEM). The photocatalytic activity of the samples was assessed in liquid-solid phase, under UVA-light and visible-light irradiation, monitoring the degradation of an organic dye. The influence of the phase composition, optical properties, dimensions, and specific surface area of the powders on the photocatalytic activity was thoroughly discussed. (C) 2012 Elsevier B.V. All rights reserved.

keywords

PHASE-TRANSFORMATION; SILVER NANOPARTICLES; POLYCRYSTALLINE TIO2; OPTICAL-PROPERTIES; LIGHT IRRADIATION; PLASMON RESONANCE; ORGANIC-COMPOUNDS; AQUEOUS SYSTEMS; TITANIA; RUTILE

subject category

Engineering

authors

Tobaldi, DM; Pullar, RC; Gualtieri, AF; Seabra, MP; Labrincha, JA

our authors

foto David Maria Tobaldi

David Maria Tobaldi

Researcher
foto João António Labrincha Baptista

João António Labrincha Baptista

Full professor
foto Maria Paula Seabra

Maria Paula Seabra

Assistant Professor
foto Rob Pullar

Rob Pullar

Collaborator

Groups

G4 - Renewable Materials and Circular Economy

Projects

Centre for Research in Ceramics and Composite Materials - CICECO (LA0011: 2011-2012) (PEst-C/CTM/LA0011/2011)

acknowledgements

Authors acknowledge PEst-C/CTM/LA0011/2011 programme. M.P. Seabra and R.C. Pullar wish to thank the FCT Ciencia2008 programme for supporting this work. D.M. Tobaldi kindly acknowledges FCT for the financial support.

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Publication Details

type
Journal Article
year
2013
journal
CHEMICAL ENGINEERING JOURNAL
volume
214
publisher
ELSEVIER SCIENCE SA
issn
1385-8947
digital object identifier
10.1016/j.cej.2012.11.018
web of science article identifier
WOS:000315322700044

Journal Metrics (JCR 2019)

Journal Impact Factor
10.652
Journal Impact Factor (5 yrs)
9.43
category normalized journal percentile
97.361

Citations

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