期刊
WATER SCIENCE AND TECHNOLOGY
卷 63, 期 7, 页码 1539-1545出版社
IWA PUBLISHING
DOI: 10.2166/wst.2011.414
关键词
dye wastewater; electrochemical degradation; intermediates
资金
- Higher Education Institution of MOE, P.R.C.
The electrochemical degradation of Methyl Orange in 0.1 M NaCl solution over RuOx-PdO/Ti anode was investigated. Chemical oxygen demand (COD), ion chromatography (IC), Fourier Transform Infrared Spectroscopy (FTIR) and Gas chromatography-mass spectrometry (GC-MS) were employed to detect the intermediates formed during the electrochemical degradation. In the present reaction system, Methyl Orange could be effectively degraded. After 1 h treatment, the discoloration could reach 97.9% with COD removal of 57.6%. The results indicated that in the presence of chloride, the electrolysis was able to oxidise the dye with partial mineralisation of carbon, nitrogen and sulfur into CO2, NO3- and SO42-, respectively. After 8 h electrolysis, 62% of sulfur contained in Methyl Orange was transformed to SO42-, and 17.6% of nitrogen changed to NO3-. The intermediates during electroprocess were detected to be low molecular weight compounds, chlorinated compounds, derivatives of benzene and long chain alkanes. Based on these data, a possible degradation mechanism of Methyl Orange was proposed.
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