Abstract
The decolorization of 2,6-dichloroindophenol dye was investigated using a heterogeneous advanced oxidation processes which comprised irradiating aqueous solutions of the dye with UV light at a wavelength of 254 nm in the presence of ZnO at a pH of 6. Rate enhancement of dye decolorization has been observed by increasing ZnO concentration up to 1 g/L. Addition of small concentrations of inorganic oxidants (H2O2 and Na2S2O8) to ZnO slurry resulted in an enhancement in the rate of dye decolorization compared with ZnO only. First order kinetics adequately described the disappearance of the dye. Reaction rate orders with respect to oxidant species were 1.2, 1.8, and 0.8 for, respectively, ZnO, H2O2, and Na2S2O8. It was observed that UV/ZnO/ is the most effective catalytic system for dye decolorization and can be applied for a wide range of organic compounds.
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