Photodegradation of Dyes from their Aqueous Solutions,Using TiO_2 as the Oxidant With Different Sources of Energy

摘要

The photodegradation has been widely used in water and wastewater treatment of all the methods, like froth flotation coagulation, etc., photodegradation appears to offer the best prospects for overall treatment of dyestuff effulent. Photodegradation of aqueous solutions of aniline blue and crystal violet dyes was carried out using TiO_2 as photocatalyst. Photodegradation of dyes from aqueous solutions of their binary mixture was also carried out. By carrying out photodegradation, varying the experimental parameters ,the optimum conditions required for maximum degradation was found out. The photodegradation of dye was carried out using different sources of energy, like solar radiation and microwave radiation.The degradation studies were carried out at temperatures 25℃, 35℃, 45℃ so as to calculate the rate constant and activation parameters. Both energy sources are equivalent in causing degradation in all respects except time and dose of photocatalyst. Time required is less for microwave than solar radiation , but dose of photocatalyst needed was high for microwave radiation. These results will be helpful in designing effluent treatment plants in industries.