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J Hazard Mater. 2011 May 15;189(1-2):278-85. doi: 10.1016/j.jhazmat.2011.02.033. Epub 2011 Feb 19.

Hydrothermal growth of free standing TiO2 nanowire membranes for photocatalytic degradation of pharmaceuticals.

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Centre for Advanced Materials Joining, Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada.


Highly entangled TiO(2) nanowires were directly synthesized by hydrothermal growth on Ti substrates at 180 °C utilizing various organic solvents to oxidize Ti. The growth mechanism, microstructure and phase transition of TiO(2) nanowire membranes were investigated in detail. TiO(2) nanowires, with diameters of 10-20 nm and lengths up to 100 μm, show a phase transition from Type-B to anatase by annealing at 700 °C. Robust, free standing TiO(2) nanowire membranes with millimeter level thickness can be cleaved from Ti substrates or directly prepared from thin Ti foils. These porous TiO(2) membranes, while effective for mechanical microfiltration, can also photocatalytically degrade pharmaceuticals such as trimethoprim under UV irradiation.

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