Alternative natural dyes in water purification: Anthocyanin as TiO2-sensitizer in rhodamin B photoelectrodegradation

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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