Abstract
Aqueous solutions of hydrolyzed Reactive Black 5 (RB5) dye, a well-known surrogate for non-biodegradable azo dyes, were photochemically and photocatalytically treated by employing the H 2O 2/UV-C and TiO 2/UV-A advanced oxidation systems, respectively. The observed effects of reaction pH, oxidant dose and initial dyestuff concentration were used to explain the OH induced color disappearance kinetics empirically. Accordingly, the waste dyestuff solutions could be completely decolorized ( k d,max=0.155 min −1; H 2O 2/UV-C system) and effectively mineralized ( k TOC,max=0.01 min −1; H 2O 2/UV-C system), with an average overall TOC removal of 78% after 120 min advanced oxidation at the specified optimized reaction conditions. The treatment via H 2O 2/UV-C was mainly governed by OH type oxidation rather than direct UV-C or UV-A photolysis, and the bleaching effect of the TiO 2/UV-A process could be successfully fitted to the empirical Langmuir–Hinshelwood (L–H) kinetic model ( k L–H=4.47 mg l −1 min −1; K L–H=2.01 l mg −1).
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