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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2698
Title: Comparative study of electrochemical oxidation for dye degradation: Parametric optimization and mechanism identification
Authors: Singh S.
Lo S.L.
Srivastava, Vimal Chandra
Hiwarkar A.D.
Published in: Journal of Environmental Chemical Engineering
Abstract: Present study investigates the direct and indirect electrochemical (EC) oxidation of malachite green (MG) dye in acidic and basic medium using RuO2-TiO2 and Pt coated Ti mesh electrodes (Ti/RuO2-TiO2 and Ti/Pt electrodes). The effects of process parameters such as current density (j), initial pH (pHo) and NaCl (electrolyte) concentration (m) during the EC oxidation were also examined. This study investigates the effect of dissolved chlorine, chlorate, chlorite, and chlorine dioxide formed during EC oxidation at different pH. Active sites of electrodes surface promote the production of OH radicals (OH). Synergistic effect of active chlorine species and OH radicals significantly enhanced the indirect EC oxidation of MG dye solution with Ti/RuO2-TiO2 anode. Gas chromatography-mass spectrometry (GC-MS), high performance liquid chromatography (HPLC), color and chemical oxygen demand (COD) were used to identify the EC oxidative degradation mechanism with both electrodes. Acidic pH was found to promote the dye degradation. Under optimum condition, MG dye was completely decolorized and 98% COD removal was obtained after 140 min of EC treatment. Based on the intermediate and by-products identification, it seems that MG dye degradation occurred via N-methylation and conjugated structure destruction. © 2016 Elsevier Ltd. All rights reserved.
Citation: Journal of Environmental Chemical Engineering (2016), 4(3): 2911-2921
URI: https://doi.org/10.1016/j.jece.2016.05.036
http://repository.iitr.ac.in/handle/123456789/2698
Issue Date: 2016
Publisher: Elsevier Ltd
Keywords: Color and COD removal
Dye degradation
Electro-oxidation
Malachite green
ISSN: 22133437
Author Scopus IDs: 57192784617
7401542147
35565811700
56362746800
Author Affiliations: Singh, S., Graduate Institute of Environmental Engineering, National Taiwan University, 71, Chou-Shan Rd.Taipei 106, Taiwan
Lo, S.L., Graduate Institute of Environmental Engineering, National Taiwan University, 71, Chou-Shan Rd.Taipei 106, Taiwan
Srivastava, V.C., Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee, Uttarakhand, 247667, India
Hiwarkar, A.D., Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee, Uttarakhand, 247667, India, Department of Chemical Engineering, Bundelkhand Institute of Engineering and Technology, Jhansi, Uttar Pradesh, 284128, India
Funding Details: Authors are thankful to Ministry of Science and Technology (MOST) Taiwan grand number ( 104-2119-M-002-001 ) for providing financial help for carrying out this work. Appendix A
Corresponding Author: Lo, S.L.; Graduate Institute of Environmental Engineering, National Taiwan University, 71, Chou-Shan Rd., Taiwan; email: sllo@ntu.edu.tw
Appears in Collections:Journal Publications [CH]

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