Basic Information
Abstract Number: 220-24    
Author Name: Fernando E Larmat Affiliation: Universidad del Valle
Session Title: New Developments in Analytical Instrumentation and Software
Event Type: Sunday Poster
Event Title: Photocatalytic Oxidation of Phenolic Compounds on Thin Films of TiO2 Deposited on Quartz Substrates
Presider(s):   Start Time: ( Slot # 24 )
Date: Sunday, March 11th, 2012 Location: Valencia Room, W415
Keywords: Analysis, Electrode Surfaces

Abstract Content
Photocatalytic oxidation of phenolic compounds aqueous solutions on thin films of TiO2 was evaluated. The films of TiO2 were deposited on quartz substrates using the technique of magnetron sputtering d.c. with a target of Ti (99.9%) at different pressures to obtain several Ar/O2 ratios. The anodes of quartz modified with thin films of TiO2 were used in an electrochemical cell with a counter electrode of platinum. The anodes were irradiated with UV light from a mercury lamp to produce the photocatalytic oxidation of the phenolic compounds studied (phenol, 4-aminophenol and 4-chlorophenol). The photocatalytic process was monitored by taken UV-Vis spectra of the solutions at different times. It was found that TiO2 films obtained with a ratio of Ar/O2=95/5 was the most efficient. The photocatalytic oxidation of the phenolic compounds in an acid media of pH=3.5 occurs slowly and ca. 70% of the initial concentration was decomposed after 2 hours of irradiation.