Pr-Si co-doped IrOx as promoted anode for refractory SDZ degradation

Electrochemical oxidation technology has been used in treating bio-refractory organic effluent. However, the energy consumption is subject to the high oxygen evolution potential (OEP) of the traditional electrode. Doped Ir-contained oxides electrode is capable of degrading pollutants efficiently at...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2021-01, Vol.881, p.114954, Article 114954
Main Authors: Sun, Cancan, Chen, Xiaodan, Ma, Chenglong, Cao, Limei, Yang, Ji
Format: Article
Language:English
Subjects:
(Ir0.4Pr0.4Si0.2)Ox
Anodizing
antibiotics degradation
Chemical evolution
Electrochemical oxidation
Electrodes
Energy consumption
Leaching
Oxidation
Performance degradation
Pollutants
SDZ
Thermal decomposition
Wastewater treatment
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Summary:Electrochemical oxidation technology has been used in treating bio-refractory organic effluent. However, the energy consumption is subject to the high oxygen evolution potential (OEP) of the traditional electrode. Doped Ir-contained oxides electrode is capable of degrading pollutants efficiently at low energy consumption. In this study, a facile (Ir0.4Pr0.4Si0.2)Ox electrode was prepared using the thermal decomposition method, which exhibits a larger electrochemical surface area (ECSA, 287.71 cm2) and tunnel structures caused by Pr and Si’s leaching. The (Ir0.4Pr0.4Si0.2)Ox electrode was applied to degrade sulfadiazine (SDZ). The parameters of the initial concentration of SDZ, electrolyte concentration, pH, and the applied voltage on SDZ removal were investigated. The optimal condition was explored, and the SDZ degradation efficiency reached 100% within 2 h. We attribute the excellent degradation performance to the presence of tunnel structures on the electrode, which promotes the generation of ·O2− and ·OH. An indirect electrochemical oxidation mechanism is proposed according to the identification of the intermediate through the LC-MS. The novel electrode achieved in this work is promising to treat acid SDZ wastewater in the electrochemical system.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2020.114954