Enhanced degradation of Orange G by permanganate with the employment of iron anode
2017
Bu, Lingjun | Shi, Zhou | Zhou, Shiqing
Iron anode was employed to enhance the degradation of Orange G (OG) by permanganate (EC/KMnO₄). Continuously generated Fe²⁺ from iron anode facilitated the formation of fresh MnO₂, which plays a role in catalyzing permanganate oxidation. The EC/KMnO₄ system also showed a better performance to remove OG than Fe²⁺/KMnO₄, indicating the importance of in situ formed fresh MnO₂. Besides, the effects of applied current, KMnO₄ dosage, solution pH, and natural organics were evaluated and results demonstrated that high current and oxidant dosage are favorable for OG removal. And the application of iron anode has a promoting effect on the KMnO₄ oxidation over a wide pH range (5.0–9.0), while the Fe²⁺/KMnO₄ process does not. For natural organics, its presence could inhibit OG removal due to its competitive role. And the promoting effect of OG removal by the EC/KMnO₄ process in natural water was confirmed. At last, the EC/KMnO₄ process showed a satisfying performance on the decolorization and mineralization of OG. This study provides a potential technology to enhance permanganate oxidation and broadens the knowledge of azo dye removal.
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