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An innovative electrochemical degradation of 1-diazo-2-naphthol-4-sulfonic acid in the presence of Bi2Fe4O9

Paper ID Volume ID Publish Year Pages File Format Full-Text
46589 46442 2011 9 PDF Available
Title
An innovative electrochemical degradation of 1-diazo-2-naphthol-4-sulfonic acid in the presence of Bi2Fe4O9
Abstract

This paper explores the degradation of a model pollutant, 1-diazo-2-naphthol-4-sulfonic acid (1,2,4-Acid), by an advanced oxidation process that combines electrochemical degradation and Bi2Fe4O9 (BFO) oxidation. Experiments were done using a gas-diffusion cathode to produce in situ hydrogen peroxide by oxygen reduction. Column crystal semiconductor Bi2Fe4O9 was synthesized and used as a novel catalyst in the combined system. It was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Comparative experiment in two separated systems (BFO/H2O2 and BFO/Electrolysis) was conducted to determine the mechanism involved in the process. The effect of operating conditions such as applied current, solution pH, catalyst dosage on the efficacy of the process was investigated. It is shown that 1,2,4-Acid and its products can be effectively degraded by the OH radicals produced by the reaction between BFO and the electro-generated H2O2, which was further being confirmed with the electron spin resonance spin-trapping technique. Hydroxyl radicals generated in the process that led to the complete and rapid elimination of total organic carbon was observed even at low catalyst loadings. In this system, almost a complete removal of COD (89%) was achieved after 200 min using 1.0 g L−1 of BFO, whereas at the same time, only 39% and 32% of COD was removed by an individual process alone (electrochemical degradation and BFO adsorption, respectively). In this combined system, BFO has the principle role of adsorbing the initial substance on the surface of catalyst and catalyzing the electro-generated H2O2 to form active hydroxyl radicals. The LC-(ESI)-TOF-MS analysis indicated that the mineralization occurred simultaneous with the destruction of naphthalene ring, and 1,2,4-Acid was oxidized to colourless intermediates (mainly phthalic acid, small carbonyl species) and then to carbon dioxide.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Spinal-like Bi2Fe4O9 was synthesized and functioned as a novel catalyst in the electro-catalyzed system. ► Gas diffusion cathode was chosen as a cathode. ► The degradation of 1-diazo-2-naphthol-4-sulfonic acid was ascribed to the synergetic effect of both catalyst and electrolysis. ► Evolution of intermediates was detected using UPLC-(ESI)-TOF-MS.

Keywords
Electrochemical degradation; Gas-diffusion electrode; 1,2,4-Acid; Bi2Fe4O9
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An innovative electrochemical degradation of 1-diazo-2-naphthol-4-sulfonic acid in the presence of Bi2Fe4O9
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 110, 2 November 2011, Pages 186–194
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us