Journal
APPLIED WATER SCIENCE
Volume 7, Issue 2, Pages 637-652Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13201-015-0276-0
Keywords
Electro-oxidation; C.I. Reactive Yellow 186; Response surface methodology (RSM); FTIR; GC-MS
Categories
Funding
- Council of Scientific and Industrial Research, Government of India, New Delhi [CSIR - SRF-09/472(0144)/2010-EMR-I]
- Department of Science and Technology, Government of India, New Delhi
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In this study, central composite design at five levels (-beta, -1, 0, +1, +beta) combined with response surface methodology has been applied to optimize C.I. Reactive Yellow 186 using electro-oxidation process with graphite electrodes in a batch reactor. The variables considered were the pH (X-1), NaCl concentration (M) (X-2), and electrolysis time (min) (X-3) on C. I. Reactive Yellow 186 were studied. A second-order empirical relationship between the response and independent variables was derived. Analysis of variance showed a high coefficient of determination value (R-2 = 0.9556 and 0.9416 for color and COD, respectively). The optimized condition of the electro-oxidation of Reactive Yellow 186 is as follows: pH 3.9; NaCl concentration 0.11 M; and electrolysis time 18 min. Under this condition, the maximal decolorization efficiency of 99 % and COD removal 73 % was achieved. Detailed physico-chemical analysis of electrode and residues of the electro-oxidation process has also been carried out UV-Visible and Fourier transform infrared spectroscopy. The intermediate compounds formed during the oxidation were identified using a gas chromatography coupled with mass spectrometry. According to these results, response surface methodology could be useful for reducing the time to treat effluent wastewater.
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