title: Degradation mechanism of Direct Pink 12B treated by iron-carbon micro-electrolysis and Fenton reaction.
abstract: The Direct Pink 12B dye was treated by iron-carbon micro-electrolysis (ICME) and Fenton oxidation. The degradation pathway of Direct Pink 12B dye was inferred by ultraviolet visible (UV-Vis), infrared absorption spectrum (IR) and high performance liquid chromatography-mass spectrometry (HPLC-MS). The major reason of decolorization was that the conjugate structure was disrupted in the iron-carbon micro-electrolysis (ICME) process. However, the dye was not degraded completely because benzene rings and naphthalene rings were not broken. In the Fenton oxidation process, the azo bond groups surrounded by higher electron cloud density were first attacked by hydroxyl radicals to decolorize the dye molecule. Finally benzene rings and naphthalene rings were mineralized to H2O and CO2 under the oxidation of hydroxyl radicals.
authors: Department of Environmental Engineering, School of Chemical Engineering and Technology, University of Science and Technology, Anshan 114051, China.  wxq_as@163.com
authors: Xiquan
authors: X
authors: Wang
authors: Department of Environmental Engineering, School of Chemical Engineering and Technology, University of Science and Technology, Anshan 114051, China.
authors: Xiaokang
authors: X
authors: Gong
authors: Department of Environmental Engineering, School of Chemical Engineering and Technology, University of Science and Technology, Anshan 114051, China.
authors: Qiuxia
authors: Q
authors: Zhang
authors: Department of Environmental Engineering, School of Chemical Engineering and Technology, University of Science and Technology, Anshan 114051, China.
authors: Haijuan
authors: H
authors: Du
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D004572:Electrolysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D013058:Mass Spectrometry; D010084:Oxidation-Reduction; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013997:Time Factors
chemical_list: D001391:Azo Compounds; C501278:Direct Red 12B; C045076:Fenton's reagent; D002244:Carbon; D006861:Hydrogen Peroxide; D007501:Iron
keywords: Direct Pink 12B; Fenton oxidation; degradation pathway; iron-carbon micro-electrolysis