Degradation mechanism of Direct Pink 12B treated by iron-carbon micro-electrolysis and Fenton reaction |
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| Authors: | Xiquan Wang Xiaokang Gong Qiuxia Zhang Haijuan Du |
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| Affiliation: | 1. LEPAE, Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal;2. Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, 18071 Granada, Spain;1. Department of Environmental Science and Engineering, School of Architecture and Environment, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China;2. Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;1. Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China;2. Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China;3. Research and Designing Institute of Environmental Protection Science, Lishan Road 50, Jinan 250100, Shandong Province, China;4. Inner Mongolia Key Laboratory of Environmental Pollution Control & Waste Resource Reuse, Inner Mongolia University, Hohhot 010021, China;1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, China;2. School of Engineering, South China Agricultural University, Guangzhou 510642, China |
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| 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. |
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| Keywords: | Fenton oxidation degradation pathway iron-carbon micro-electrolysis Direct Pink 12B |
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