NDLI: Electrochemical Degradation of an Anthraquinonic Dye on an Expanded Graphite-Diamond Composite Electrode

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Electrochemical Degradation of an Anthraquinonic Dye on an Expanded Graphite-Diamond Composite Electrode

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Electrochemical Degradation of an Anthraquinonic Dye on an Expanded Graphite-Diamond Composite Electrode

Content Provider	Springer Nature Link
Author	Peleyeju, M. G. Umukoro, E. H. Babalola, J. O. Arotiba, O. A.
Copyright Year	2015
Abstract	In recent times, there has been increasing interest in the exploration of electrochemical approaches for the destruction of organic pollutants in wastewater owing to their ability to degrade recalcitrant pollutants in our water. This work demonstrated the use of expanded graphite-diamond anode for the degradation of acid blue 40 (AB 40) dye. Expanded graphite (EG) and expanded graphite-diamond (EG-diamond) electrodes were prepared and characterised using Raman spectrometry, x-ray diffraction, scanning electron microscopy and cyclic voltammetry. The electrolysis of the analyte in 0.1 M Na$_{2}$SO$_{4}$ electrolyte resulted in ca. 80 % dye removal at the EG-diamond electrode and 66 % removal at the pristine EG electrode at a current density of 20 mAcm$^{−2}$ after 4 h. However, in a chlorine-mediated electrolysis (NaCl as supporting electrolyte), the decolourisation of the dye was very rapid with over 98 % decolourisation in 25 min. The extent of mineralisation was measured by total organic carbon (TOC). EG-diamond and EG electrodes yielded TOC removal of 44 and 26 % respectively in the sodium sulphate supported cell. The degradation of AB 40 follows a pseudo first-order kinetic model with apparent rate constants of 2.34 × 10$^{−3}$ min$^{−1}$ and 4.41 × 10$^{−3}$ min$^{−1}$ obtained at EG and EG-diamond electrodes, respectively. The EG-diamond electrode was further applied in the degradation of orange II dye (OG II) and a mixture of OG II and AB 40 with a TOC removal of 49 % for the dye mixture.
Starting Page	132
Ending Page	139
Page Count	8
File Format	PDF
ISSN	18682529
Journal	Electrocatalysis
Volume Number	7
Issue Number	2
e-ISSN	18685994
Language	English
Publisher	Springer US
Publisher Date	2015-11-13
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Expanded graphite Expanded graphite-diamond electrode Electrochemical degradation Acid blue 40 dye Decolourisation Orange II dye Electrochemistry Physical Chemistry Catalysis Energy Technology
Content Type	Text
Resource Type	Article
Subject	Electrochemistry

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