期刊
WATER RESEARCH
卷 70, 期 -, 页码 414-424出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2014.12.022
关键词
Heterogeneous electro-Fenton; Modified iron-carbon; 2,4-Dichlorophenol; Air diffusion electrode; Degradation mechanism
资金
- Natural Science Foundation of China [21273120, 51178225, 21250110515]
- National High Technology Research and Development Program of China [2013AA065901, 2013AA06A205]
- Fund for the Doctoral Program of Higher Education of China [20110031110025]
- Fundamental Research Funds for the Central Universities
Modified iron carbon with polytetrafluoroethylene (PTFE) was firstly investigated as heterogeneous electro-Fenton (EF) catalyst for 2,4-dichlorophenol (2,4-DCP) degradation in near neutral pH condition. The catalyst was characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), and the effects of some important operating parameters such as current intensity and pH on the 2,4-DCP degradation were investigated. After the catalyst modification with 20% PTFE, the degradation performance maintained well with much lower iron leaching, and at current intensity 100 mA, initial pH 6.7, catalyst loading 6 g/L, the degradation efficiency of 2,4-DCP could exceed 95% within 120 mm treatment. Two-stage pseudo first-order kinetics of 2,4-DCP degradation was observed, including a slow anodic oxidation stage (first-stage) and much faster heterogeneous EF oxidation (second-stage), in which the automatic drop of pH in the first-stage initiated the Fe2+ release from micro-electrolysis and thus benefited to the subsequent EF reaction. Aromatic intermediates such as 3,5-dichlorocatechol, 4,6-dichlororesorcinol and 2-chlorohydroquinone were detected by GC-MS. Oxalic acid, acetic acid, formic acid and Cl- were quantified by ion chromatograph. Based on these analysis as well as the detection of H2O2 and center dot OH, a possible mechanism and degradation pathway for 2,4-DCP were proposed. This work demonstrated that such a heterogeneous EF using cheap modified Fe-C catalyst was promising for organic wastewater treatment in initial neutral pH condition. (C) 2014 Elsevier Ltd. All rights reserved.
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