title: Enhanced degradation of Orange G by permanganate with the employment of iron anode.
abstract: 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/KMnO4system 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, KMnO4dosage, 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 KMnO4oxidation over a wide pH range (5.0-9.0), while the Fe2+/KMnO4process 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/KMnO4process in natural water was confirmed. At last, the EC/KMnO4process 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.
authors.affiliation: Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, Hunan, 410082, People's Republic of China.
authors.forename: Lingjun
authors.initials: L
authors.lastname: Bu
authors.affiliation: Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, Hunan, 410082, People's Republic of China.
authors.forename: Zhou
authors.initials: Z
authors.lastname: Shi
authors.affiliation: Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, Hunan, 410082, People's Republic of China. shiqingzhouwater@163.com.
authors.forename: Shiqing
authors.initials: S
authors.lastname: Zhou
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D055664:Electrochemical Techniques; D004566:Electrodes; D007501:Iron / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry*; D016877:Oxidants / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D017895:Manganese Compounds; D016877:Oxidants; D010087:Oxides; D014874:Water Pollutants, Chemical; C048856:permanganic acid; C008710:Orange G; C027424:manganese oxide; D007501:Iron
keywords: Azo dyes; Ferrous ion; Manganese dioxide; Permanganate