engleski

Textile dyes degradation by UV/TiO2/H2O2 process ; a factorial experimental design approach

Advanced oxidation process (AOP), UV/TiO2/H2O2, has been applied for a degradation of the commercially available reactive dyes, C.I. Reactive Yellow 3 (RY3) and C.I. Reactive Violet 2 (RV2), used as model organic pollutants in synthetic wastewater. In order to decolorize and to minimize the organic content of RY3-RV2 synthetic wastewater, the effects of key operating parameters such as initial pH, hydrogen peroxide and TiO2 concentrations on the oxidation of the dyes have been assessed. The statistical study of the process was performed using two-level 23 full factorial experimental design (DoE) with these three factors ; (X1) H2O2 concentration, (X2) TiO2 dosage and (X3) pH value of the system. Other process parameters ; initial concentration of dyes, UV light intensity, reaction time, temperature and stirring velocity were adjusted at fixed values. Individual factors and their interaction effects on decrease in concentration of both reactive dyes were determined. Optimal range for each key operating parameter was found. Numerical optimization resulted in several "points" i.e. combinations of investigated parameters with highest efficiency of mineralization and decolorization predicted.

advanced oxidation process (AOP); UV/TiO2/H2O2 process; reactive dyes; 23 factorial experimental design; statistical study; numerical optimization

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