| Summary: | This study aims to explore the feasibility of using iron slag derived from an electric arc furnace (EAFS) as a catalyst to degrade Reactive Black 5 (RB5). Raw EAFS (R-EAFS) subjected to 0.1 M NaOH solution treatment and thermal treatment was denoted as activated EAFS (A-EAFS). A-EAFS was characterized and examined for its capability to degrade RB5 in a dark-batch reaction under different catalyst dosages (0.01–0.06 g), H2O2 dosages (2–12 mM), initial pH values (2–7), initial concentrations (25–150 ppm), and reaction temperatures (303–323 K). The optimal conditions (94% within 60 min) for RB5 degradation were 0.2 g L−1, 8 mM H2O2, and pH 3. The degradation rate of A-EAFS for RB5 exceeded 94%, which was higher than that of R-EAFS. Recycling of A-EAFS after 10 reuses suggested that this stability is ascribed to the regeneration of the major constituent's ferrous ion magnetite and maghemite to decompose H2O2 into hydroxyl radical catalytically. Therefore, A-EAFS is an alternative heterogeneous catalyst in the abatement of organic dyes from polluted water through a heterogeneous Fenton-like reaction. © 2016 Taiwan Institute of Chemical Engineers
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