23 January,2017

Nano-materials for solar energy mediated photocatalytic dye degradation and their use in real world application

 Contributed by Don Selvin, Heramb Podar, Varun Alagappan, Atharva Ghadi, Nirnay Korde

Project guide: Anitha Philip  

This project work is focused on the utilization of solar energy for the treatment of coloured dyeing wastewater by photocatalytic method. The dyes containing azo group and anthraquinone group are used in textile dyeing industry and are difficult to remove from effluent water. Rose Bengal dye having anthraquinone group and methyl red dye having azo type are chosen as model dye compounds. The reaction was performed in an open-type batch photo-reactor under sunlight using TiO2 as photo-catalyst. The photocatalytic activity of commercial TiO2 (Merck) and Nano TiO2 are compared for the degradation of the dyes. The progress of the reaction was monitored by measuring absorbance using UV-Visible spectrophotometer. The results showed that complete decolourization of the rose bengal dye was observed at 60 min and 50 min respectively for commercial TiO2 and nano TiO2. The decolourization of the methyl red dye was observed at 80 min and 60 min respectively for commercial TiO2 and nano TiO2. Studies on the photocatalytic decolourization of simulated dyeing wastewater shows that complete removal of the dye from highly coloured textile dyeing effluent was achieved at 4 hours of solar irradiation using nano TiO2 catalysts. From the present study, we conclude that nano TiO2 catalysts can be applied for the degradation of a wide range of organic pollutants, thus contributing to an enhanced industrial wastewater treatment process with the distinct advantage of utilizing the solar energy.