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9 December 2015 Alternative natural dyes in water purification: Anthocyanin as TiO2-sensitizer in rhodamin B photoelectrodegradation
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Proceedings Volume 9792, Biophotonics Japan 2015; 97921E (2015)
Event: SPIE/OSJ Biophotonics Japan, 2015, Tokyo, Japan
Natural molecular dye, anthocyanin, from mangosteen rind (Garcinia mangostana L.) is described here as safe sensitizer for TiO2 particles in photodegradation of organic contaminants in water. The dye is a promising replacement for the more costly and hazardous heavy metal based systems, such as Fe-complexes and Ru-complexes. Anthocyanin was used as a sensitizer in TiO2/anthocyanin photoanode. Those photoanodes was effectively catalyzed the photoelectrodegradation of Rhodamine B contaminant under halogen lamp of 300 watt. The natural dye molecules showed the tendency to degrade under photoelectrodegradation conditions.However, complete mineralization of rhodamine B as well as anthocyanin occurred leaving no traces of organic species in solution. Sensitizer degradation caused deactivation of the supported catalyst on recovery. Such a short coming was overcome by re-treatment of the recovered catalysts with fresh dye. It was noted that the NaCl electrolyte significantly influenced the RB
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S. Wahyuningsih, A. H. Ramelan, R. Hidayat, G. Fadillah, H. Munawaroh, L. N. M. Z. Saputri, and Q. A. Hanif "Alternative natural dyes in water purification: Anthocyanin as TiO2-sensitizer in rhodamin B photoelectrodegradation", Proc. SPIE 9792, Biophotonics Japan 2015, 97921E (9 December 2015);

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