Abstract
Application of central composite design for the optimization of photo-destruction of a textile dye using UV/S2O8 2- process The photooxidative destruction of C. I. Basic Red 46 (BR46) by UV/S2O8 2- process is presented. Central Composite Design (CCD) was employed to optimize the effects of operational parameters on the photooxidative destruction efficiency. The variables investigated were the initial dye and S2O8 2- concentrations, reaction time and distance of the solution from UV lamp. The predicted values of the photodestruction efficiency were found to be in good agreement with the experimental values (R2 = 0.9810, Adjusted R2 = 0.9643). The results of the optimization predicted by the model showed that the maximum decolorization efficiency (>98%) was achieved at the optimum conditions of the reaction time 10 min, initial dye concentration 10 mg/l, initial peroxydisulfate concentration 1.5 mmol/l and distance of UV lamp from the solution 6 cm. The figure-of-merit electrical energy per order (EEo) was employed to estimate the electrical energy consumption and related treatment costs.
Highlights
Textile dyes and other industrial dyestuffs constitute one of the largest groups of organic compounds that represent an increasing environmental danger
In order to evaluate the influence of operating parameters on the decolorization efficiency of Basic Red 46 (BR46), four main factors were chosen: reaction time (X1), initial dye concentration (X2), initial S2O82- concentration (X3) and distance of the solution from UV lamp (X4)
After verifying by a further experimental test with the predicted values, the result indicated that the maximal decolorization efficiency was obtained when the values of each parameter were set as the optimum values, which was in good agreement with the value predicted from the model
Summary
Textile dyes and other industrial dyestuffs constitute one of the largest groups of organic compounds that represent an increasing environmental danger. As it has been reported previously[9,10,11,12], UV/S2O82- oxidation process is dependent on various parameters such as initial dye concentration, reaction time, UV light intensity and the amount of peroxydisulfate.
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