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Role of Lithium Copper Molybdate as Photocatalyst for the Degradation of Indigo Carmine Dye: An Ecofriendly Approach

Meenakshi Joshi, Poonam Kumawat, Rakshit Ameta and Suresh C. Ameta

Li2CuMo2O8 was used as photocatalyst for the degradation of indigo carmine dye. It was synthesized by solid state reaction between Li2CO3, CuO and MoO3. The effect of variation of different parameters, i.e., pH, amount of semiconductor, concentration of dye and light intensity was also investigated. Maximum (92%) degradation of indigo carmine was observed. The formation of the inorganic products, NO3 – and SO4 2– and the evolution CO2 revealed continuous mineralization of indigo carmine dye during the photocatalytic process. Quality parameters of dye solution before and after degradation were also determined. The rate of photodegradation of indigo carmine dye followed pseudo-first order kinetics. A tentative mechanism has been proposed.