Abstract
Problem statement: In present study, we selected a model dyes Ponceau S and Sudan IV, to test a recently developed photo catalyst methylene blue immobilized resin dowex-11. Approach: This is a light-activated process that has been successfully applied to remove organic and inorganic dyes of textile industries. Results: The reactor, made of glass slides (tubes) coated with a thin-film of methylene blue immobilized resin dowex-11 with the help of a suitable and non-reactive adhesive. Dye solution was continues recycles from reactor for 3 h in a recirculation mode under various conditions (with/without catalyst, with/without light radiation, variation in catalyst amount, dyes concentration, light intensities and pH). Conclusion: The ponceau S and sudan-IV, removal efficiency was evaluated using UV/Visible spectrophotometer at λmax = 514±2 nm Ponceau S and λMax = 520 nm respectively removal efficiency results (99%) after 3 h at pH 9) showed that new photo catalyst, methylene blue immobilized resin dowex-11 provided a promising technology to improve the quality of effluent from textile wastewater treatment plants.
Highlights
Wastewater of textile industries can not treated successfully by conventional treatment methods and presently used methods gives low quality water not suitable to use for domestic utilization
Catalyst surface area is fixed so as the concentration of dye increases rate of degradation decreases because limited number of dye molecules attach at the active site of the catalyst and remaining dye molecules persist in solution until earlier attached molecules are degraded and affects the rate of photo catalytic degradation
Methylene blue is photo sensitive in nature, when light radiation is irradiated on due surface due to its electrons transfer from Valance Band (VB) to Conduction Band (CB) and through Intersystem Crossing (ISC) electron reach in to triplet state of methylene blue
Summary
Wastewater of textile industries can not treated successfully by conventional treatment methods and presently used methods gives low quality water not suitable to use for domestic utilization. Ever since 1977, when Frank and bard[2,3] first examined the possibilities of using TiO2 to decompose cyanide in water, there has been increasing interest in environmental applications Treatment plants have applied additional processes, like coagulation, or adsorption for the removal of the contaminants[4-6]. These processes transfer pollutants from their water matrix into bio-solids, rather than completely eliminating these chemicals. TiO2 photocatalysis was found to be effective for the destruction of a wide variety of environmental contaminants present in water and wastewater, this technology has not yet been successfully commercialized in past because of the costs and problems connected to the separation of TiO2 particles from the suspension after treatment.
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