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An α-Fe2O3/Circulating Fluidized Bed Fly Ash Based Geopolymer Composite Anode for Electrocatalytic Degradation of Indigo Carmine Dye Wastewater

Jiaqian Lei, Yaojun Zhang*, Panyang He
College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China
* Corresponding Author: Yaojun Zhang. Email:
(This article belongs to this Special Issue: Current Advances in Green Nanomaterials Applications)

Journal of Renewable Materials 2021, 9(12), 2277-2289. https://doi.org/10.32604/jrm.2021.015824

Received 16 January 2021; Accepted 15 March 2021; Issue published 22 June 2021

Abstract

Geopolymers have been developed to various catalysts due to their advantages. However, low conductivity restricts their application in the electrocatalysis field. In this study, an α-Fe2O3/circulating fluidized bed fly ash based geopolymer (CFAG) composite anode was fabricated using a facile dip-coating method by loading α-Fe2O3 in the matrix of CFAG. The effects of α-Fe2O3 content on the composition, surface morphology and electrochemical performance of α-Fe2O3/CFAG composite anode were investigated. The X-ray diffraction (XRD) and scanning electron microscope (SEM) results demonstrated that α-Fe2O3 was successfully inlaid with the surface of amorphous CFAG matrix. The electrochemical measurements indicated that α-Fe2O3/CFAG composite anode had higher oxygen evolution potential, greater electrochemical activity area, and smaller electrochemical impedance than CFAG. The as-prepared composite anode was applied for electrocatalytic degradation of indigo carmine dye wastewater. It was discovered that the highest degradation efficiency over 10α-Fe2O3/CFAG reached up 92.6%, and the degradation of indigo carmine followed pseudo-first-order kinetics. Furthermore, 10α-Fe2O3/ CFAG composite anode presented excellent stability after five cycles. The active hydroxyl radical was generated over the α-Fe2O3/CFAG composite anode, which acted as strong oxidizing agents in the electrocatalytic degradation process.

Graphical Abstract

An α-Fe<sub>2</sub>O<sub>3</sub>/Circulating Fluidized Bed Fly Ash Based Geopolymer Composite Anode for Electrocatalytic Degradation of Indigo Carmine Dye Wastewater

Keywords

Geopolymers; composite anode; electrocatalytic oxidation; dye degradation

Cite This Article

Lei, J., Zhang, Y., He, P. (2021). An α-Fe2O3/Circulating Fluidized Bed Fly Ash Based Geopolymer Composite Anode for Electrocatalytic Degradation of Indigo Carmine Dye Wastewater. Journal of Renewable Materials, 9(12), 2277–2289.

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This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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