Abstract
This study describes the dye removal under the iron oxide(FeOOH) catalysed decomposition of hydrogen peroxide. FeOOH was selected as iron oxide. The effect of FeOOH concentration, H2O2 concentration, the presence of radical scavenger, and pH on the dye removal and the decomposition of hydrogen peroxide was investigated. The rate of H2O2 decomposition was obtained as a pseudo-first-order kinetics relative to FeOOH concentration. However, despite of the increased H2O2 decomposition rate, the dye removal rate was not proportional to FeOOH concentration because FeOOH surface plays a role of scavenging OH radical. The H2O2 decomposition by FeOOH at pH 7 was more significant than that at pH 3, suggesting the possibility for overcoming limitations of homogeneous Fenton reaction which occurs only in acidic condition. The mechanism for the dye removal under the iron oxide catalysed decomposition of hydrogen peroxide was suggested, based on the experimental results obtained in this study.
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