Decolorization of acid black 24 by the FeGAC/H2O2 process.

FeGAC/H2O2 process was developed and employed in this research for the treatment of acid back 24. The removal efficiencies of five treatment processes (GAC, FeGAC, H2O2, GAC/H2O2, and FeGAC/H2O2) were studied in this research. The adsorption capacity of granular activated carbon (GAC) was greatly improved by the coating of iron oxide on GAC surface (FeGAC). The presence of H2O2 significantly improved the removal abilities of FeGAC and GAC. For instance, at solution pH 2, the removal efficiency of FeGAC/H2O2, GAC/H2O2, H2O2, FeGAC, and GAC were 76, 74, 59, 11, and 7%, respectively. The possible removal mechanisms of FeGAC/H2O2 process were proposed in this research. When treating the actual dye contaminated wastewater, the removal efficiencies of FeGAC/H2O2 and GAC/H2O2 were approximately six times greater than that of H2O2 process.