Advanced Oxidative Decolorization of Red Cl-5B: Effects of Dye Concentration, Process Optimization and Reaction Kinetics
Hajira Khan1, Nasir Ahmad1, Abdullah Yasar2, Rukhsana Shahid1
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1Directorate of Research and Development, University of the Punjab, Lahore Pakistan
2Sustainable Development Study Center GC University Lahore Pakistan
Pol. J. Environ. Stud. 2010;19(1):83–92
Process conditions (dye concentration, pH and oxidant dose) were optimized for UV, O3, H2O2/UV, O3/UV, H3O2/O3, and H2O2/O3/UV to treat Red Cl-5B dye of varying concentrations (100, 300, and 500 mg/L). Ozonation resulted in color removal of more than 90%, whereas H2O2/O3 showed no advantage over the O3 alone. However, H2O2/UV was found to be very suitable as it gave almost 100% decolorization in a relatively short reaction time. Decolorization rate for all processes was reduced to half when the dye concentration was increased from 100 to 300 mg/l. Comparative study of rate constants revealed that H2O2/UV is four times faster than that of UV alone. On the other hand O3/H2O2 is three to four times slower than O3 alone.