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Evolution of photo-catalytic properties of reactive plasma processed nano-crystalline titanium dioxide powder
Authors:M Vijay  PV Ananthapadmanabhan  KP Sreekumar
Institution:aDepartment of Physics, Bharathiar University, Coimbatore 641046, India;bLaser & Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 400085, India
Abstract:Nano-crystalline titanium oxide powder was synthesized by reactive plasma processing using titanium hydride as the precursor powder. Photo-catalytic properties of the product were evaluated by monitoring the degradation of methylene blue dye solution. The photo-catalytic activity of plasma-synthesized nano-sized titania powder could be enhanced considerably by incorporating surface Ti3+ sites and hydroxyl groups. Thermal treatment of the as-synthesized powder in flowing Ar–H2 helped to incorporate surface Ti3+ and hydroxyl species, resulting in considerable increase in the catalytic activity. Subsequent hydrothermal treatment of the powder led to a five-fold increase in the photo-catalytic activity.
Keywords:Photo-catalysis  Reactive plasma processing  Nano-structure  Titanium dioxide  Arc plasma synthesis  Surface property
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