title: Degradation of C. I. Acid Orange 7 in aqueous solution by a novel electro/Fe3O4/PDS process.
abstract: The decolorization of C. I. Acid Orange 7 (AO7) in aqueous solution by Fe3O4 activated peroxydisulfate (PDS) oxidation in an electrochemical reactor (EC/Fe3O4/PDS process) was performed in this study. Various parameters were investigated to optimize the process, including initial pH, current density, PDS concentration and Fe3O4 dosage. The stability of Fe3O4 particles was observed by recycle experiments. The X-ray photoelectron spectroscopy (XPS) was applied to investigate the surface properties of Fe3O4 before and after reaction. GC-MS analysis was employed to identify the intermediate products and a plausible degradation pathway of AO7 was proposed. The change of acute toxicity during the treatment was investigated by activated sludge inhibition test. The TOC removal efficiency was 30.0% in a 90min reaction.
authors.affiliation: Department of Environmental Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, PO Box C319, Luoyu Road No. 129, Wuhan 430079, China.
authors.forename: Heng
authors.initials: H
authors.lastname: Lin
authors.affiliation: Department of Environmental Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, PO Box C319, Luoyu Road No. 129, Wuhan 430079, China. Electronic address: eeng@whu.edu.cn.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Department of Environmental Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, PO Box C319, Luoyu Road No. 129, Wuhan 430079, China.
authors.forename: Liwei
authors.initials: L
authors.lastname: Hou
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D004563:Electrochemistry; D005290:Ferric Compounds / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006863:Hydrogen-Ion Concentration; D056951:Photoelectron Spectroscopy; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; C000499:ferric oxide
keywords: AO7; Electrochemical oxidation; Fe(3)O(4); Peroxydisulfate; Sulfate radicals