DEGRADASI METHYL VIOLET DAN METHYLEN BLUE OLEH FOTOKATALIS TIO2

Abstract

ABSTRACT

One alternative to degraded toxical and carcinogenical dyes were by using UV photocatalysis with semiconductor particles. This research aims to determine optimum irradiation time to degraded methyl violet and methylene blue and to understand the degraded percentages and mechanism. We used Degussa P25 TiO2 by addition of SiO2 to prevent recombinant of e- and h+. Iradiation times we used were 1, 2, 3, 4, 5, 6, and 7 hour, respectively. After degrading process, methyl violet and methylene blue absorbance was measured by UV-Vis Spectrophotometer. TiO2/SiO2 crystallinity was characterized using XRD. Experimental results showed that optimum photocatalytic activity was obtained at 10 ppm dyes concentration, irradiation time were 6 hour for methyl violet and 5 hour for methylene blue for 5 ppm in concentration, respectively. At this condition, we obtained degraded percentage was 81.02% for methyl violet and 87.61% for methylene blue, respectively. In addition, the layer formation was 5 times and number of glass column was 11 as well. In fact, measurement by GC for methyl violet before irradiation were 5 peaks however after irradiation by UV was 9 peaks, in contrast, for methylene blue before and after irradiation were 4 and 7 peaks respectively. The peak addition for GC Chromatogram confirmed us that dyes had been gradually degraded. Finally, XRD characterizations showed that there were mixed anatase and rutile crystal structures in 19.1 nm size. Keywords: Methyl Violet, Methylen Blue, Photocatalyst, TiO2, Degradation