Titania nanotubes (TiNT) with high specific surface area, excellent photocatalytic activity, non-toxicity, and tuneable chemical properties are gaining prominence in photocatalytic treatment of wastewater. However, titania itself has a wide bang gap which is inactive under visible light. This study reports the doping of platinum into the core or interlayer of titania nanotubes which exhibit excellent photocatalytic activity in degradation of diclofenac in water. The titania nanotube was firstly synthesized via microwave-assisted continuous flow process, followed by introducing platinum nanoparticles. The influence of the operation parameters of continuous microwave-assisted flow synthesis, including heating temperature, pressure and residence time has been investigated. The microwave synthesis was conducted at a milder temperature and pressure and a shorter time than the traditional hydrothermal method. Further, by introduction of platinum nanoparticles, photocatalytic activity of titania nanotubes could be effectively improved by facilitating visible light absorption and enhancing charge separation efficiency. The prepared Pt/TiNT catalysts were characterized by TEM, XRD, micro-Raman, UV-vis spectra and XPS, and examined the photocatalytic activity in degradation of diclofenac in water under visible light.

Platinum doped titania nanotubes synthesized via microwave-assisted flow process for photocatalytic degradation of diclofenac

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