SOL GEL PREPARATION OF TiO2/ZrO2 FILMS AND PHOTOCATALYTIC REDUCTION OF Cr(VI) IN AQUEOUS ACID MEDIA

摘要

In the past years problems related to the elimination of toxic and hazardous chemical substances such as heavy-metal and radioactive ions from waste effluents and previously contaminated sites have emerged as a high international priority.Chromium (VI) is a very toxic pollutant,which is present in a great variety of industrial wastes.