PHOTOCATALYTIC DEGRADATION Cr (VI) BY ZSM-5 IMPREGNATED TiO2 IN VARIOUS UV-IRRADIATION TIME

Abstract

Chromium is considered as one of the most common ubiquitous pollutants in aquatic environment. There were qualities standard about Chromium content in drinking water and fresh water. Oxidation of Chromium were Cr (II), Cr (III) and Cr (VI).  Among these, Cr (VI) is considered as the most toxic form because it readily passes cellular membranes and then reduced to Cr (III). TiO2    as catalyst can activated and modified zeolites with active metal materials i.e ZSM-5 impregnated TiO2. Main objective of study was to determine decreased percentage of Cr (VI) in water by using ZSM-5 impregnated TiO2  based on UV irradiation time. This study was used Completely Randomized Design i.e length of UV irradiation. Result  showed Cr (VI) content was decreasing with various length  of  UV  irradiation  in  15;30;45;60;75  minutes,  respectively  is  17.01; 17.99; 18.99; 28,73; 36, 20%. The highest percentage decrease of Cr (VI) ion content during 75 minute UV irradiation is 39,42%. Chromium (VI) content could be solved with zeolite ZSM-5 impregnated TiO2  by using photocatalytic method. In conclusion, the longer UV   irradiation time caused higher of decreased percentage Cr (VI).

Keywords: Chromium,  Photocatalytic, Zeolite, Impregnated