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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2721
Title: Electro-oxidation of nitrophenol by ruthenium oxide coated titanium electrode: Parametric, kinetic and mechanistic study
Authors: Kumar S.
Singh S.
Srivastava V.C.
Published in: Chemical Engineering Journal
Abstract: Present study investigates mechanism of electrochemical (EC) oxidative degradation of p-nitrophenol (PNP) by ruthenium oxide coated titanium (Ti/RuO2) electrode. First, the process proficiency was determined in terms of chemical oxygen demand (COD), total organic carbon (TOC), current efficiency (CE) and specific energy consumption (SEC) under different experiment conditions of initial pH (pHo), current density (j), electrolyte concentration (m) and initial PNP concentration (Co). Maximum COD and TOC removal efficiencies of 98.9% and 81.9%, respectively, were obtained at j=168.9A/m2, pHo=5.5, Co=100mg/L and m=300mg/L with SEC of 535.7kWh/kg COD. PNP degradation mechanism has also been proposed on the basis of identification of intermediates by gas chromatograph coupled with mass spectrometry (GC/MS). Various intermediates such as quinine, benzoquinone, organic acids and small mineralization products were obtained during the EC treatment of PNP. PNP was found to be oxidized by both direct (hydroxyl radical generated via water electrolysis on anode surface) and indirect (via mediators, hypochlorous acid and active chlorine generated during chlorine oxidation in solution) EC oxidation. Kinetics of EC oxidation was represented by pseudo-first order kinetic model. © 2014 Elsevier B.V.
Citation: Chemical Engineering Journal (2015), 263(): 135-143
URI: https://doi.org/10.1016/j.cej.2014.11.051
http://repository.iitr.ac.in/handle/123456789/2721
Issue Date: 2015
Publisher: Elsevier
Keywords: Degradation mechanism
Electro-oxidation
Electrochemical
Kinetics
Nitrophenol
Specific energy consumption
ISSN: 13858947
Author Scopus IDs: 57213856932
57192784617
35565811700
Author Affiliations: Kumar, S., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
Singh, S., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
Srivastava, V.C., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
Corresponding Author: Srivastava, V.C.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia
Appears in Collections:Journal Publications [CH]

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