Comprehensive electrocatalytic degradation of tetracycline in wastewater by electrospun perovskite manganite nanoparticles supported on carbon nanofibers

Springer Science and Business Media LLC - Tập 5 - Trang 2092-2105 - 2022
Ziheng Li1, Wenhao Xie1, Feichong Yao1,2, Ai Du3, Qiaoying Wang4, Zhanhu Guo5, Hongbo Gu1
1Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, People’s Republic of China
2College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, People’s Republic of China
3Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai, People's Republic of China
4State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai, China
5Integrated Composites Lab (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, USA

Tóm tắt

The perovskite manganite La0.7Ca0.3MnO3 nanoparticle/carbon nanofiber (LCMO/CNF) nanocomposites are developed by annealing the electrospun polyvinylpyrrolidone (PVP) mixed with nitrates (manganous nitrate, lanthanum (III) nitrate, and calcium nitrate) to work as electrocatalysts for the degradation of tetracycline (TC). The results show that the LCMO/CNFs fabricated with annealing at 250 °C for 120 min in the air atmosphere and subsequent calcination at 650 °C for 60 min possess an outstanding TC degradation performance. The TC degradation percentage (DP%) could reach 94.0% for 10 mg L−1 of TC solution with 0.1 mol L−1 of Na2SO4 as supporting electrolyte within only 1 h at a bias voltage of 1.0 V (vs. SCE). The LCMO/CNF-modified electrode possesses an average power consumption of 5.41 kWh kg−1 and the overall Faraday efficiency of 46.37% after 180 min of treatment, revealing a high efficiency and a relatively low cost. The TC DP% is changed from 87.8 to 84.8% after five cycles of electrocatalytic process for LCMO/CNF-modified electrode, implying an excellent durability, recyclability, and reusability. The TC degradation mechanism and pathways have also been explored. The results exhibit that the LCMO/CNFs could thoroughly electrocatalytically degrade TC into carbon dioxide and water at the end. This work provides a novel electrocatalyst for treatment of antibiotics contaminated wastewater with relatively low cost.

Tài liệu tham khảo

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