Monitoring the Effects of Irradiation of Ethylenediaminetetraacetic Acid Over Titanium Oxide Thin Films Using Attenuated Total Reflectance Infrared Spectroscopy

Shafer, Jonathan, Cleo Vidican, Emily Rames, Patricia Walworth, Antonella Conflitti, and Katherine Lanigan

Attenuated total reflectance infrared spectroscopy (ATR-FTIR) has been used to study the effects of variation in the pH and metal ion complexation on the adsorption behavior of ethylenediaminetetraacetic acid onto titanium dioxide thin films. These in situ studies were carried out with the use of a flow-through apparatus which allowed for monitoring of adsorbed species on the surface of thin films during the course of the experiments. In addition, irradiation studies were performed in order to investigate the photo-initiated degradation of EDTA in the presence of titanium dioxide particles. A quartz window within the ATR apparatus was used to transmit ultraviolet radiation from a 300 W xenon arc lamp onto the thin film. Several techniques were used for identification of the product of irradiation including the use of the Nash reagent for detection of formaldehyde.