期刊
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
卷 65, 期 -, 页码 390-398出版社
ELSEVIER
DOI: 10.1016/j.jtice.2016.05.050
关键词
Sulfate radical; Hydroxyl radical; Peroxydisulfate; Goethite; Electrochemical oxidation
资金
- Natural Science Foundation of China [21547006]
- Shenzhen Basic Research Plan Project [JCYJ20150508152951667]
- Fundamental Research Funds for the Central Universities [2042016kf0060]
- Largescale Instrument and Equipment Sharing Foundation of Wuhan University
The decolorization of Orange II by an electro-enhanced goethite (alpha-FeOOH) activating peroxydisulfate (PDS) process (EC/alpha-FeOOH/PDS process) is reported in this study. Sulfate radicals was produced by activating PDS with Fe(II), which was generated continuously from the cathodic reduction of Fe(III) on alpha-FeOOH surface. The decolorization of Orange II showed little dependence on the initial pH. The comparison of Orange II decolorization under different systems was investigated. The surface properties of a-FeOOH before and after reaction were investigated by X-ray Photoelectron Spectroscopy (XPS). The radical species generated in EC/alpha-FeOOH/PDS process were determined by Electron Paramagnetic Resonance (EPR). On the basis of the results, the mechanism of Orange II decolorization in EC/alpha-FeOOH/PDS process was proposed. The catalyst alpha-FeOOH maintained its high activity during repeated batch experiments. Response surface methodology (RSM) based on Box-Behnken statistical experiment design (BBD) was applied to analyze the experimental variables. The response surface methodology models were derived from the experimental results and the response surface plots of the pseudo-first-order decolorization rate constant were developed accordingly. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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