Fabrication of PbO 2 Electrodes with Different Doses of Er Doping for Sulfonamides Degradation

Tianyu Zheng, Chunli Wei, Hanzhi Chen, Jin Xu, Yanhong Wu () and Xuan Xing ()
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Tianyu Zheng: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Chunli Wei: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Hanzhi Chen: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Jin Xu: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Yanhong Wu: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Xuan Xing: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China

IJERPH, 2022, vol. 19, issue 20, 1-15

Abstract: In the present study, PbO 2 electrodes, doped with different doses of Er (0%, 0.5%, 1%, 2%, and 4%), were fabricated and characterized. Surface morphology characterization by SEM-EDS and XRD showed that Er was successfully doped into the PbO 2 catalyst layer and the particle size of Er-PbO 2 was reduced significantly. Electrochemical oxidation of sulfamerazine (SMR) in the Er-PbO 2 anode system obeyed te pseudo first-order kinetic model with the order of 2% Er-PbO 2 > 4% Er-PbO 2 > 1% Er-PbO 2 > 0.5% Er-PbO 2 > 0% PbO 2 . For 2% Er-PbO 2 , k SMR was 1.39 h ?1 , which was only 0.93 h ?1 for 0% PbO 2 . Effects of different operational parameters on SMR degradation in 2% Er-PbO 2 anode system were investigated, including the initial pH of the electrolyte and current density. Under the situation of an initial pH of 3, a current density of 30 mA·cm ?2 , a concentration of SMR 30 mg L ?1 , and 0.2 M Na 2 SO 4 used as supporting electrolyte, SMR was totally removed in 3 h, and COD mineralization efficiency was achieved 71.3% after 6 h electrolysis. Furthermore, the degradation pathway of SMR was proposed as combining the active sites identification by density functional calculation (DFT) and intermediates detection by LC-MS. Results showed that Er-PbO 2 has great potential for antibiotic wastewater treatment in practical applications.

Keywords: PbO 2 electrode; Er doping; electrochemical oxidation; sulfamerazine; intermediates (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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