Title: Hydrothermal synthesis of mixed phase blue titanium dioxide from oxalate stabilised sols
Authors: C. McNicoll; F. Abu Bakar; V. Golovko; T. Kemmitt
Addresses: Advanced Materials, Callaghan Innovation, 69 Gracefield road, P.O. Box 31310, Lower Hutt 5040, New Zealand ' Advanced Materials, Callaghan Innovation, 69 Gracefield road, P.O. Box 31310, Lower Hutt 5040, New Zealand ' Advanced Materials, Callaghan Innovation, 69 Gracefield road, P.O. Box 31310, Lower Hutt 5040, New Zealand ' Advanced Materials, Callaghan Innovation, 69 Gracefield road, P.O. Box 31310, Lower Hutt 5040, New Zealand
Abstract: Blue coloured titanium dioxide nanoparticles were synthesised by the hydrothermal treatment of oxalic acid stabilised titania sols in the presence of NH4F as a modifying agent. The NH4F concentration determined the phase of titania produced and influenced the shape of the rutile crystallites produced. The blue colour originated from the F-stabilised Ti3+ centres formed under the reaction conditions. Organic residues in the sol decomposed to generate a hydrogen-rich atmosphere. Photocatalytic activity studies revealed the rutile phase titania produced was extremely active for a given surface area when compared to P-25.
Keywords: titanium dioxide; blue TiO2 nanoparticles; self-doped; Ti3+; NH4F; ammonium fluoride; photocatalysis; hydrothermal synthesis; oxalate stabilised sols; nanotechnology; titania sols; rutile crystallites.
International Journal of Nanotechnology, 2017 Vol.14 No.1/2/3/4/5/6, pp.265 - 275
Published online: 24 Feb 2017 *
Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article