|
This document is available in the Adobe Acrobat PDF Format.
Click here for information
about Portable Document File (PDF) Formats.
or
Click here
to directly download the Acrobat Reader.
(To view the PDF, it is recommended that you
use the most current Acrobat Reader)
Photoelectrocatalytic Degradation and Removal
of Organic and Inorganic Contaminants in Ground Waters
EPA 540/F-01/502
April 2001
Abstract:
Technology Description: The University of Wisconsin – Madison (UW-Madison)
is developing a photocatalytic technology that uses titanium dioxide (TiO2)
suspensions to coat various supports used in aqueous treatment applications.
Photocatalysis involves the use of UV light to illuminate the surface of a catalyst
such as TiO2. As the photocatalyst absorbs near- UV light, electrons in the
valence band are excited into the conduction band and produce highly reactive
electrons and holes that promote oxidation of organic compounds. In this project
researchers sought to overcome some of the challenges of photocatalysis by developing
a “biased” photoreactor. A metallic substrate was coated with TiO to prepare
a 2 photoelectrode which was then combined with a cathode to form an electrolytic
cell. UV light illuminates the TiO2 coating on the electrode and allows the
electrolytic cell to serve as a biased photoreactor, which was the subject of
this study. A design for a biased photoreactor in an annular configuration is
shown below. A similar system was employed for this project.
Back to SITE Home Page
Posted February 07, 2002
|
