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Open AccessArticle

A 2.5D Electrode System Constructed of Magnetic Sb–SnO2 Particles and a PbO2 Electrode and Its Electrocatalysis Application on Acid Red G Degradation

1
Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2
Department of Structures and Environmental Engineering, University of Agriculture, Faisalabad 38040, Pakistan
3
Water Affair Science and Technology Research Institute, Shaanxi Water Affair Group, Xi’an 710021, China
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(11), 875; https://doi.org/10.3390/catal9110875
Received: 9 October 2019 / Revised: 19 October 2019 / Accepted: 21 October 2019 / Published: 23 October 2019
(This article belongs to the Special Issue Green Synthesis and Catalysis)
A novel electrode consisting of a Ti/PbO2 shell and Fe3O4/Sb–SnO2 particles was developed for electrochemical oxidation treatment of wastewater. Scanning electron microscope (SEM), X-ray diffraction (XRD), the current limiting method, toxicity experiments, and high-performance liquid chromatography were adopted to characterize its morphology, crystal structure, electrochemical properties, the toxicity of the wastewater, and hydroxyl radicals. Acid Red G (ARG), a typical azo dye, was additionally used to test the oxidation ability of the electrode. Results indicated that the 2.5D electrode could significantly improve the mass transfer coefficient and •OH content of the 2D electrode, thereby enhancing the decolorization, degradation, and mineralization effect of ARG, and reducing the toxicity of the wastewater. The experiments revealed that, at higher current density, lower dye concentration and higher temperature, the electrochemical oxidation of ARG favored. Under the condition of 50 mA/cm2, 25 °C, and 100 ppm, the ARG, Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC) removal efficiency reached 100%, 65.89%, and 52.52%, respectively, and the energy consumption and the current efficiency were 1.06 kWh/g COD, 8.29%, and energy consumption for TOC and mineralization current efficiency were 3.81 kWh/g COD, 9.01%. Besides, the Fe3O4/Sb–SnO2 particles after electrolysis for 50 h still had remarkable stability. These results indicated that the ARG solution could be adequately removed on the 2.5D electrode, providing an effective method for wastewater treatment. View Full-Text
Keywords: 2.5D electrode; electrochemical oxidation; the mass transfer coefficient; hydroxyl radicals 2.5D electrode; electrochemical oxidation; the mass transfer coefficient; hydroxyl radicals
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MDPI and ACS Style

Yuan, M.; Salman, N.M.; Guo, H.; Xu, Z.; Xu, H.; Yan, W.; Liao, Z.; Wang, Y. A 2.5D Electrode System Constructed of Magnetic Sb–SnO2 Particles and a PbO2 Electrode and Its Electrocatalysis Application on Acid Red G Degradation. Catalysts 2019, 9, 875.

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