Electrochemical Oxidation of Methyl Orange in an Active Carbon Packed Electrode Reactor (ACPER): Degradation Performance and Kinetic Simulation

Jing Hou, Xue Li, Yuting Yan and Lizhang Wang
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Jing Hou: Environmental Energy Engineering ( E3 ) Workgroup, School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Xue Li: Environmental Energy Engineering ( E3 ) Workgroup, School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Yuting Yan: Environmental Energy Engineering ( E3 ) Workgroup, School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Lizhang Wang: Environmental Energy Engineering ( E3 ) Workgroup, School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China

IJERPH, 2022, vol. 19, issue 8, 1-12

Abstract: The efficient removal and kinetic modelling of methyl orange (MO) degradation using an electrocatalytic oxidation method in an activated carbon (AC) packed electrode reactor (ACPER) were conducted. A significantly high (81.2%) chemical oxygen demand (COD) and 100.0% MO decolorization efficiency were observed under the experimental conditions of current density of 3.0 mA·cm −2 , flow velocity of 0.3 L·h −1 , and treatment duration of 1.68 h using a β -PbO 2 /Ti anode. The high removal efficiency is ascribed to the anode expansion effect after AC packing. The anode expansion coefficient ( λ ) of the ACPER was calculated to be 0.63 from the cyclic voltammetry (CV) measurement, which means the further current utilization for MO oxidation. Based on the current utilization efficiency on anodic and particle electrode surfaces, a phase-reaction kinetics model was proposed for the simulation of MO COD removal efficiency. Our simulation results showed that the newly established average current efficiency ( ACE ) and energy consumption ( E sp ) model well matched the MO experimental degradation data. Our work broadens the scope of the application of ACPER in the treatment industry wastewater containing organics and provides a new strategy for the energy utilization evaluation during the removal of organic matter by electrocatalytic oxidation.

Keywords: methyl orange; electrocatalytic oxidation; ACPER; anode expansion coefficient; phase-reaction kinetics model (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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