Titanium oxide has been proven the most promising material for water treatment via Advance oxidation process (AOP) due to its low recombination rate and high capacity to generate hydroxyl radicals, its most important downside is restricted photocatalytic activity to the UV range. Enhancing photocatalytic activity under visible light has been the objective of a lot of researchers around the world. Plasmon resonance in conjunction with traditional semiconductor photocatalyst provides an opportunity to understand and improve on the already useful properties of titanium oxide. The present study is focused on the interaction of an anodized titanium surface (ATS) and silver nanoparticles (Ag-NP) deposited on the ATS by photo electrochemical electroless reduction. Photocatalytic activity enhanced by plasmon resonance is expected to improve the material activity in two fronts, via the metal semiconductor junction where the electron hole (e/h) separation and fast lane charge transfer are induced, and a second front where localized surface plasmon resonance (LSPR) benefit photocatalysis by enabling visible light response, enhancing Visible/UV absorption, local electric fields reducing (e/h) diffusion length, generation of LSPR powered (e/h), local heating effects, lastly molecule polarization.

ATS was form by anodic oxidation of a titanium sheet at 30 V for 120 minutes in an organic electrolyte compose of ethylenglicol, NH₄F and water at 5%. Subsequently Ag-NP were deposited by photoreduction of 0.1 M AgNO_3, The material was characterized by cyclic voltammetry and scanning electron microscopy. The photo response to visible and UV light was evaluated by zero-current chronopotenciometry. The ATS/ Ag-NP system was successfully fabricated showing a porous titanium oxide surface, decorated by Ag-NP with a uniform size of around 60 nm. Results shows an increase in the visible light response provoked by the silver deposit, the way the photocatalytc response is affected appears to be dependent on the amount of silver deposited, and the size of the particles. Further studies on the effect of the nanostructures over the photocatalytic activity are being conducted.