Paper Title
Comparison Of Contrast Media Elimination By Means Of Photo Catalysis Using Modified And Unmodified Titanium Dioxide

Abstract
A lot of studies have revealed that unmetabolised drugs enter the sewage system and, later, appear in the wastewater treatment plants. The treatment process in the plant usually fails to completely eliminate the drugs from wastewater. In consequence, the drugs, together with treated wastewater, are released into surface waters. Iodinated contrast media (ICM) are substances used for imaging tissues, internal organs, etc., are commonly detected in aquatic environment in concentrations up to several milligrams (i.e. hospital wastewater). In this study, the investigation of the effectiveness of iohexol removal by means of solar irradiation with use TiO2 and TiO2+GO as catalysts was performed. The results showed that it was possible to achieve the significant iohexol elimination (above 90%) during photocatalysis process within 180 minutes. Moreover, the iohexol removal in the solar/TiO2+GO process was more efficient than solar/TiO2 alone and the time needed for its elimination was notably shortened with use of hybrid catalyst. Key Words - Photocatalysis, contrast media, wastewater treatment